The Experts below are selected from a list of 4113 Experts worldwide ranked by ideXlab platform

Philippe Lognonne - One of the best experts on this subject based on the ideXlab platform.

  • acoustic waves generated from seismic surface waves propagation properties determined from doppler sounding observations and normal mode modelling
    Geophysical Journal International, 2004
    Co-Authors: Juliette Artru, Thomas Farges, Philippe Lognonne
    Abstract:

    SUMMARY Since 1960, experiments have shown that perturbations of the ionosphere can occur after earthquakes, by way of dynamic coupling between seismic surface waves and the atmosphere. The atmospheric wave is amplified exponentially while propagating upwards due to the decrease of density, and interaction with the ionospheric plasma leads to clearly identified signals on both ground-based or satellite ionospheric measurements. In 1999 and 2000, after an upgrade of the HF Doppler sounder, the Commisariat ` ’´ Energie Atomique systematically recorded these effects in the ionosphere with the Francourville (France) network, by measuring vertical oscillations of ionospheric layers with the Doppler technique. Normal-mode theory extended to a solid Earth with an atmosphere allows successful modelling of such signals, even if this 1-D approach is probably too crude, especially in the solid Earth, where 20 s surface waves see large lateral variations in the crust. The combination of observations and simulations provides a new tool to determine acoustic gravity wave propagation characteristics from the ground to ionospheric height. Observed velocity and amplification of the atmospheric waves show good agreement from the ground up to moderate sounding altitudes (140‐150 km); however, at higher altitudes the propagation speed is found to be much smaller than predicted and attenuation is underestimated. This shows that the standard formalism of acoustic gravity waves in the atmosphere cannot efficiently describe propagation in the ionized atmosphere. Further work is needed to characterize the propagation of acoustic waves in this altitude range: we believe that seismic waves can provide a well-constrained source for such study.

  • acoustic waves generated from seismic surface waves propagation properties determined from doppler sounding observations and normal mode modelling
    Geophysical Journal International, 2004
    Co-Authors: Juliette Artru, Thomas Farges, Philippe Lognonne
    Abstract:

    SUMMARY Since 1960, experiments have shown that perturbations of the ionosphere can occur after earthquakes, by way of dynamic coupling between seismic surface waves and the atmosphere. The atmospheric wave is amplified exponentially while propagating upwards due to the decrease of density, and interaction with the ionospheric plasma leads to clearly identified signals on both ground-based or satellite ionospheric measurements. In 1999 and 2000, after an upgrade of the HF Doppler sounder, the Commisariat ` ’´ Energie Atomique systematically recorded these effects in the ionosphere with the Francourville (France) network, by measuring vertical oscillations of ionospheric layers with the Doppler technique. Normal-mode theory extended to a solid Earth with an atmosphere allows successful modelling of such signals, even if this 1-D approach is probably too crude, especially in the solid Earth, where 20 s surface waves see large lateral variations in the crust. The combination of observations and simulations provides a new tool to determine acoustic gravity wave propagation characteristics from the ground to ionospheric height. Observed velocity and amplification of the atmospheric waves show good agreement from the ground up to moderate sounding altitudes (140‐150 km); however, at higher altitudes the propagation speed is found to be much smaller than predicted and attenuation is underestimated. This shows that the standard formalism of acoustic gravity waves in the atmosphere cannot efficiently describe propagation in the ionized atmosphere. Further work is needed to characterize the propagation of acoustic waves in this altitude range: we believe that seismic waves can provide a well-constrained source for such study.

Juliette Artru - One of the best experts on this subject based on the ideXlab platform.

  • acoustic waves generated from seismic surface waves propagation properties determined from doppler sounding observations and normal mode modelling
    Geophysical Journal International, 2004
    Co-Authors: Juliette Artru, Thomas Farges, Philippe Lognonne
    Abstract:

    SUMMARY Since 1960, experiments have shown that perturbations of the ionosphere can occur after earthquakes, by way of dynamic coupling between seismic surface waves and the atmosphere. The atmospheric wave is amplified exponentially while propagating upwards due to the decrease of density, and interaction with the ionospheric plasma leads to clearly identified signals on both ground-based or satellite ionospheric measurements. In 1999 and 2000, after an upgrade of the HF Doppler sounder, the Commisariat ` ’´ Energie Atomique systematically recorded these effects in the ionosphere with the Francourville (France) network, by measuring vertical oscillations of ionospheric layers with the Doppler technique. Normal-mode theory extended to a solid Earth with an atmosphere allows successful modelling of such signals, even if this 1-D approach is probably too crude, especially in the solid Earth, where 20 s surface waves see large lateral variations in the crust. The combination of observations and simulations provides a new tool to determine acoustic gravity wave propagation characteristics from the ground to ionospheric height. Observed velocity and amplification of the atmospheric waves show good agreement from the ground up to moderate sounding altitudes (140‐150 km); however, at higher altitudes the propagation speed is found to be much smaller than predicted and attenuation is underestimated. This shows that the standard formalism of acoustic gravity waves in the atmosphere cannot efficiently describe propagation in the ionized atmosphere. Further work is needed to characterize the propagation of acoustic waves in this altitude range: we believe that seismic waves can provide a well-constrained source for such study.

  • acoustic waves generated from seismic surface waves propagation properties determined from doppler sounding observations and normal mode modelling
    Geophysical Journal International, 2004
    Co-Authors: Juliette Artru, Thomas Farges, Philippe Lognonne
    Abstract:

    SUMMARY Since 1960, experiments have shown that perturbations of the ionosphere can occur after earthquakes, by way of dynamic coupling between seismic surface waves and the atmosphere. The atmospheric wave is amplified exponentially while propagating upwards due to the decrease of density, and interaction with the ionospheric plasma leads to clearly identified signals on both ground-based or satellite ionospheric measurements. In 1999 and 2000, after an upgrade of the HF Doppler sounder, the Commisariat ` ’´ Energie Atomique systematically recorded these effects in the ionosphere with the Francourville (France) network, by measuring vertical oscillations of ionospheric layers with the Doppler technique. Normal-mode theory extended to a solid Earth with an atmosphere allows successful modelling of such signals, even if this 1-D approach is probably too crude, especially in the solid Earth, where 20 s surface waves see large lateral variations in the crust. The combination of observations and simulations provides a new tool to determine acoustic gravity wave propagation characteristics from the ground to ionospheric height. Observed velocity and amplification of the atmospheric waves show good agreement from the ground up to moderate sounding altitudes (140‐150 km); however, at higher altitudes the propagation speed is found to be much smaller than predicted and attenuation is underestimated. This shows that the standard formalism of acoustic gravity waves in the atmosphere cannot efficiently describe propagation in the ionized atmosphere. Further work is needed to characterize the propagation of acoustic waves in this altitude range: we believe that seismic waves can provide a well-constrained source for such study.

Thomas Farges - One of the best experts on this subject based on the ideXlab platform.

  • acoustic waves generated from seismic surface waves propagation properties determined from doppler sounding observations and normal mode modelling
    Geophysical Journal International, 2004
    Co-Authors: Juliette Artru, Thomas Farges, Philippe Lognonne
    Abstract:

    SUMMARY Since 1960, experiments have shown that perturbations of the ionosphere can occur after earthquakes, by way of dynamic coupling between seismic surface waves and the atmosphere. The atmospheric wave is amplified exponentially while propagating upwards due to the decrease of density, and interaction with the ionospheric plasma leads to clearly identified signals on both ground-based or satellite ionospheric measurements. In 1999 and 2000, after an upgrade of the HF Doppler sounder, the Commisariat ` ’´ Energie Atomique systematically recorded these effects in the ionosphere with the Francourville (France) network, by measuring vertical oscillations of ionospheric layers with the Doppler technique. Normal-mode theory extended to a solid Earth with an atmosphere allows successful modelling of such signals, even if this 1-D approach is probably too crude, especially in the solid Earth, where 20 s surface waves see large lateral variations in the crust. The combination of observations and simulations provides a new tool to determine acoustic gravity wave propagation characteristics from the ground to ionospheric height. Observed velocity and amplification of the atmospheric waves show good agreement from the ground up to moderate sounding altitudes (140‐150 km); however, at higher altitudes the propagation speed is found to be much smaller than predicted and attenuation is underestimated. This shows that the standard formalism of acoustic gravity waves in the atmosphere cannot efficiently describe propagation in the ionized atmosphere. Further work is needed to characterize the propagation of acoustic waves in this altitude range: we believe that seismic waves can provide a well-constrained source for such study.

  • acoustic waves generated from seismic surface waves propagation properties determined from doppler sounding observations and normal mode modelling
    Geophysical Journal International, 2004
    Co-Authors: Juliette Artru, Thomas Farges, Philippe Lognonne
    Abstract:

    SUMMARY Since 1960, experiments have shown that perturbations of the ionosphere can occur after earthquakes, by way of dynamic coupling between seismic surface waves and the atmosphere. The atmospheric wave is amplified exponentially while propagating upwards due to the decrease of density, and interaction with the ionospheric plasma leads to clearly identified signals on both ground-based or satellite ionospheric measurements. In 1999 and 2000, after an upgrade of the HF Doppler sounder, the Commisariat ` ’´ Energie Atomique systematically recorded these effects in the ionosphere with the Francourville (France) network, by measuring vertical oscillations of ionospheric layers with the Doppler technique. Normal-mode theory extended to a solid Earth with an atmosphere allows successful modelling of such signals, even if this 1-D approach is probably too crude, especially in the solid Earth, where 20 s surface waves see large lateral variations in the crust. The combination of observations and simulations provides a new tool to determine acoustic gravity wave propagation characteristics from the ground to ionospheric height. Observed velocity and amplification of the atmospheric waves show good agreement from the ground up to moderate sounding altitudes (140‐150 km); however, at higher altitudes the propagation speed is found to be much smaller than predicted and attenuation is underestimated. This shows that the standard formalism of acoustic gravity waves in the atmosphere cannot efficiently describe propagation in the ionized atmosphere. Further work is needed to characterize the propagation of acoustic waves in this altitude range: we believe that seismic waves can provide a well-constrained source for such study.

Eroe J. - One of the best experts on this subject based on the ideXlab platform.

  • Relative Modification of Prompt psi(2S) and J/psi Yields from pp to PbPb Collisions at root(S)(NN)=5.02 TeV
    PHYSICAL REVIEW LETTERS, 2017
    Co-Authors: Sirunyan A. M., Tumasyan A., Adam W., Asilar E., Bergauer T., Brandstetter J., Brondolin E., Dragicevic M., Eroe J., Flechl M.
    Abstract:

    The relative modification of the prompt psi(2S) and J/psi yields from pp to PbPb collisions, at the center-of- mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples collected by the CMS experiment at the LHC in 2015, corresponding to integrated luminosities of 28.0 pb(-1) and 464 mu b(-1), respectively. The double ratio of measured yields of prompt charmonia reconstructed through their decays into muon pairs,(N-psi(2S)/N J/psi )(PbPb)/(N-psi((2S))/N (J/psi) )(pp),is determined as a function of PbPb collision centrality and charmonium transverse momentum p(T), in two kinematic intervals: broken vertical bar y vertical bar < 1.6 covering 6.5 < pT < 30 GeV/c and 1.6 < broken vertical bar y vertical bar < 2.4 covering 3 < pT < 30 GeV/c. The centrality-integrated double ratios are 0.36 +/- 0.08(stat) +/- 0.05(syst) in the first interval and 0.24 +/- 0.22(stat) +/- 0.09(syst) in the second. The double ratio is lower than unity in all the measured bins, suggesting that the psi(2S) yield is more suppressed than the J/psi yield in the explored phase space.Bundesministerium fur Wissenschaft, Forschung und Wirtschaft (BMWFW) (Austria); Austrian Science Fund (FWF) (Austria); Belgian Fonds de la Recherche Scientifique (FNRS) (Belgium); Belgian Fonds voor Wetenschappelijk Onderzoek (FWO) (Belgium); Conselho Nacional de Desenvolvimento Cientifico e Tecnelogica (CNPq) (Brazil); Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) (Brazil); Fundacao de Amparo a Pesquisa do Estado de Rio de Janeiro (FAPERJ) (Brazil); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) (Brazil); Bulgarian Ministry of Education and Science (MES) (Bulgaria); CERN; Chinese Academy of Sciences (CAS) (China); Ministry of Science and Technology (MoST) (China); Chinese National Natural Science Foundation of China (NSFC) (China); Colombian Funding Agency (COLCIENCIAS) (Colombia); Croatian Ministry of Science, Education and Sport (MSES) (Croatia); Croatian Science Foundation (CSF) (Croatia); Research Promotion Foundation (RPF) (Cyprus); Secretaria de Educacion Superior, Ciencia, Tecnologia e Innovacion (SENESCYT) (Ecuador); Ministry of Education and Research (MoER) (Estonia); Estonian Research Council (ERC IUT) (Estonia) [IUT23-4, IUT23-6]; European Regional Development Fund (ERDF) (Estonia); Academy of Finland (Finland); Finnish Ministry of Education and Culture (MEC) (Finland); Helsinki Institute of Physics (HIP) (Finland); Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA) (France); Centre National de la Recherche Scientifique (CNRS)/Institut National de Physique Nucleaire et de Physique des Particules (IN2P3) (France); Bundesministerium fur Bildung und Forschung (BMBF) (Germany); Deutsche Forschungsgemeinschaft (DFG) (Germany); Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF) (Germany); General Secretariat for Research and Technology (GSRT) (Greece); Orszagos Tudomanyos Kutatasi Alapprogramok (OTKA) (Hungary); National Innovation Office (NIH) (Hungary); Department of Atomic Energy (DAE) (India); Department of Science and Technology (DST) (India); Institute for Research in Fundamental Studies (IPM) (Iran); Science Foundation (SFI) (Ireland); Istituto Nazionale di Fisica Nucleare (INFN) (Italy); Korean Ministry of Education, Science and Technology (MSIP) (Republic of Korea); National Research Foundation of Korea (NRF) (Republic of Korea); Lithuanian Academy of Sciences (LAS) (Lithuania); Ministry of Education (MOE) (Malaysia); University of Malaya (UM) (Malaysia); Benemerita Universidad Autonoma de Puebla (BUAP) (Mexico); Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional (CINVESTAV) (Mexico); Consejo Nacional de Ciencia y Tecnologia (CONACYT) (Mexico); Laboratorio Nacional de Supercomputo del Sureste (LNS) (Mexico); Secretaria de Educacion Publica (SEP) (Mexico); Universidad Autonoma de San Luis Potosi (UASLP-FAI) (Mexico); Ministry of Business, Innovation and Employment (MBIE) (New Zealand); Pakistan Atomic Energy Commission (PAEC) (Pakistan); Ministry of Science and Higher Education (MSHE) (Poland); National Science Centre (NSC) (Poland); Fundacao para a Ciencia e a Tecnologia (FCT) (Portugal); Joint Institute for Nuclear Research (JINR) (Dubna); Ministry of Education and Science of the Russian Federation (MON) (Russia); Federal Agency of Atomic Energy of the Russian Federation (RosAtom) (Russia); Russian Academy of Sciences (RAS) (Russia); Russian Foundation for Basic Research (RFBR) (Russia); Ministry of Education, Science and Technological Development of Serbia (MESTD) (Serbia); Secretaria de Estado de Investigacion, Desarrollo e Innovacion (SEIDI) (Spain); Programa ConsoliderIngenio (CPAN) (Spain); Swiss Funding Agencies (Switzerland); Ministry of Science and Technology (MST) (Taipei); Thailand Center of Excellence in Physics (ThEPCenter) (Thailand); Institute for the Promotion of Teaching Science and Technology of Thailand (IPST) (Thailand); Special Task Force for Activating Research (STAR) (Thailand); National Science and Technology Development Agency of Thailand (NSTDA) (Thailand); Scientific and Technical Research Council of Turkey (TUBITAK) (Turkey); Turkish Atomic Energy Authority (TAEK) (Turkey); National Academy of Sciences of Ukraine (NASU) (Ukraine); State Fund for Fundamental Researches (SFFR) (Ukraine); Science and Technology Facilities Council (STFC) (United Kingdom); US Department of Energy (DOE) (USA); US National Science Foundation (NSF) (USA)SCI(E)ARTICLE1611

  • Inclusive search for supersymmetry using razor variables in pp collisions at root s=13 TeV
    PHYSICAL REVIEW D, 2017
    Co-Authors: Sirunyan A. M., Tumasyan A., Adam W., Asilar E., Bergauer T., Brandstetter J., Brondolin E., Dragicevic M., Eroe J.
    Abstract:

    An inclusive search for supersymmetry using razor variables is performed in events with four or more jets and no more than one lepton. The results are based on a sample of proton-proton collisions corresponding to an integrated luminosity of 2.3 fb(-1) collected with the CMS experiment at a center-ofmass energy of s root s = 13 TeV. No significant excess over the background prediction is observed in data, and 95% confidence level exclusion limits are placed on the masses of new heavy particles in a variety of simplified models. Assuming that pair-produced gluinos decay only via three-body processes involving third-generation quarks plus a neutralino, and that the neutralino is the lightest supersymmetric particle with a mass of 200 GeV, gluino masses below 1.6 TeV are excluded for any branching fractions for the individual gluino decay modes. For some specific decay mode scenarios, gluino masses up to 1.65 TeVare excluded. For decays to first-and second-generation quarks and a neutralino with a mass of 200 GeV, gluinos with masses up to 1.4 TeVare excluded. Pair production of top squarks decaying to a top quark and a neutralino with a mass of 100 GeV is excluded for top squark masses up to 750 GeV.Austrian Federal Ministry of Science, Research and Economy; Austrian Science Fund; Belgian Fonds de la Recherche Scientifique; Fonds voor Wetenschappelijk Onderzoek; Brazilian Funding Agency (CNPq); Brazilian Funding Agency (CAPES); Brazilian Funding Agency (FAPERJ); Brazilian Funding Agency (FAPESP); Bulgarian Ministry of Education and Science; CERN; Chinese Academy of Sciences; Ministry of Science and Technology and National Natural Science Foundation of China; Colombian Funding Agency (COLCIENCIAS); Croatian Ministry of Science, Education and Sport; Croatian Science Foundation; Research Promotion Foundation, Cyprus; Ministry of Education and Research, Estonian Research Council [IUT23-4, IUT23-6]; European Regional Development Fund, Estonia; Academy of Finland; Finnish Ministry of Education and Culture; Helsinki Institute of Physics; Institut National de Physique Nucleaire et de Physique des Particules/CNRS, France; Commissariat a l'Energie Atomique et aux Energies Alternatives/CEA, France; Bundesministerium fur Bildung und Forschung, Germany; Deutsche Forschungsgemeinschaft, Germany; Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; General Secretariat for Research and Technology, Greece; National Scientific Research Foundation, Hungary; National Innovation Office, Hungary; Department of Atomic Energy, India; Department of Science and Technology, India; Institute for Studies in Theoretical Physics and Mathematics, Iran; Science Foundation, Ireland; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Science, ICT and Future Planning, Republic of Korea; National Research Foundation, Republic of Korea; Lithuanian Academy of Sciences; Ministry of Education, Malaysia; University of Malaya, Malaysia; Mexican Funding Agency (BUAP); Mexican Funding Agency (CINVESTAV); Mexican Funding Agency (CONACYT); Mexican Funding Agency (LNS); Mexican Funding Agency (SEP); Mexican Funding Agency (UASLP-FAI); Ministry of Business, Innovation and Employment, New Zealand; Pakistan Atomic Energy Commission; Ministry of Science and Higher Education, Poland; National Science Centre, Poland; Fundacao para a Ciencia e a Tecnologia, Portugal; Joint Institute for Nunclear Research in Dubna; Ministry of Education and Science of the Russian Federation; Federal Agency of Atomic Energy of the Russian Federation; Russian Academy of Sciences; Russian Foundation for Basic Research; Ministry of Education, Science and Technological Development of Serbia; Secretaria de Estado de Investigacion, Spain; Desarrollo e Innovacion and Programa Consolider-Ingenio, Spain; Swiss Funding Agency (ETH Board); Swiss Funding Agency (ETH Zurich); Swiss Funding Agency (PSI); Swiss Funding Agency (SNF); Swiss Funding Agency (UniZH); Swiss Funding Agency (Canton Zurich); Swiss Funding Agency (SER); Ministry of Science and Technology, Taiwan; Thailand Center of Excellence in Physics; Institute for the Promotion of Teaching Science and Technology of Thailand; Special Task Force for Activating Research; National Science and Technology Development Agency of Thailand; Scientific and Technical Research Council of Turkey; Turkish Atomic Energy Authority; National Academy of Sciences of Ukraine; State Fund for Fundamental Researches; Science and Technology Facilities Council, UK; US Department of Energy; US National Science Foundation; Marie-Curie program; European Research Council; EPLANET; European Union; Leventis Foundation; A.P. Sloan Foundation; Alexander von Humboldt Foundation; Belgian Federal Science Policy Office; Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture, Belgium; Agentschap voor Innovatie door Wetenschap en Technologie, Belgium; Ministry of Education, Youth and Sports of the Czech Republic; Council of Science and Industrial Research, India; HOMING PLUS program of the Foundation for Polish Science; European Union, Regional Development Fund; Mobility Plus program of the Ministry of Science and Higher Education, Poland; OPUS program of the National Science Center, Poland; Thalis program; Aristeia program; EU-ESF; Greek NSRF; National Priorities Research Program by Qatar National Research Fund; Programa Clarin-COFUND del Principado de Asturias; Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University, Thailand; Chulalongkorn Academic into Its 2nd Century Project Advancement Project, Thailand; Welch Foundation [C-1845]SCI(E)ARTICLE19

  • Search for dark matter particles in proton-proton collisions at root 8 = TeV using the razor variables
    JOURNAL OF HIGH ENERGY PHYSICS, 2016
    Co-Authors: Sirunyan A. M., Tumasyan A., Adam W., Asilar E., Bergauer T., Brandstetter J., Brondolin E., Dragicevic M., Eroe J.
    Abstract:

    A search for dark matter particles directly produced in proton-proton collisions recorded by the CMS experiment at the LHC is presented. The data correspond to an integrated luminosity of 18.8 fb(-1), at a center-of-mass energy of 8 TeV. The event selection requires at least two jets and no isolated leptons. The razor variables are used to quantify the transverse momentum balance in the jet momenta. The study is performed separately for events with and without jets originating from b quarks. The observed yields are consistent with the expected backgrounds and, depending on the nature of the production mechanism, dark matter production at the LHC is excluded at 90% confidence level for a mediator mass scale I > below 1 TeV. The use of razor variables yields results that complement those previously published.Austrian Federal Ministry of Science, Research and Economy; Austrian Science Fund; Belgian Fonds de la Recherche Scientifique; Fonds voor Wetenschappelijk Onderzoek; CNPq; CAPES; FAPERJ; FAPESP; Bulgarian Ministry of Education and Science; CERN; Chinese Academy of Sciences; Ministry of Science and Technology; National Natural Science Foundation of China; Colombian Funding Agency (COLCIENCIAS); Croatian Ministry of Science, Education and Sport; Croatian Science Foundation; Research Promotion Foundation, Cyprus; Ministry of Education and Research; Estonian Research Council [IUT23-4, IUT23-6]; European Regional Development Fund, Estonia; Academy of Finland; Finnish Ministry of Education and Culture; Helsinki Institute of Physics; Institut National de Physique Nucleaire et de Physique des Particules / CNRS; Commissariat a l'Energie Atomique et aux Energies Alternatives / CEA, France; Bundesministerium fur Bildung und Forschung, Germany; Deutsche Forschungsgemeinschaft, Germany; Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; General Secretariat for Research and Technology, Greece; National Scientific Research Foundation, Hungary; National Innovation Office, Hungary; Department of Atomic Energy, India; Department of Science and Technology, India; Institute for Studies in Theoretical Physics and Mathematics, Iran; Science Foundation, Ireland; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Science, ICT and Future Planning, Republic of Korea; National Research Foundation (NRF), Republic of Korea; Lithuanian Academy of Sciences; Ministry of Education (Malaysia); University of Malaya (Malaysia); CINVESTAV; CONACYT; SEP; UASLP-FAI; Ministry of Business, Innovation and Employment, New Zealand; Pakistan Atomic Energy Commission; Ministry of Science and Higher Education, Poland; National Science Center, Poland; Fundacao para a Ciencia e a Tecnologia, Portugal; JINR, Dubna; Ministry of Education and Science of the Russian Federation; Federal Agency of Atomic Energy of the Russian Federation; Russian Academy of Sciences; Russian Foundation for Basic Research; Ministry of Education, Science and Technological Development of Serbia; Secretaria de Estado de Investigacion, Desarrollo e Innovacion; Programa Consolider-Ingenio, Spain; ETH Board; ETH Zurich; PSI; SNF; UniZH; Canton Zurich; SER; Ministry of Science and Technology, Taipei; Thailand Center of Excellence in Physics; Institute for the Promotion of Teaching Science and Technology of Thailand; Special Task Force for Activating Research; National Science and Technology Development Agency of Thailand; Scientific and Technical Research Council of Turkey; Turkish Atomic Energy Authority; National Academy of Sciences of Ukraine; State Fund for Fundamental Researches, Ukraine; Science and Technology Facilities Council, U.K; US Department of Energy; US National Science FoundationSCI(E)ARTICLE1

  • Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at root s=8 TeV
    JOURNAL OF INSTRUMENTATION, 2015
    Co-Authors: Sirunyan A. M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Eroe J., Friedl M., Fruehwirth R., Ghete V. M.
    Abstract:

    The performance and strategies used in electron reconstruction and selection at CMS are presented based on data corresponding to an integrated luminosity of 19.7 fb(-1), collected in proton-proton collisions at root s = 8TeV at the CERN LHC. The paper focuses on prompt isolated electrons with transverse momenta ranging from about 5 to a few 100 GeV. A detailed description is given of the algorithms used to cluster energy in the electromagnetic calorimeter and to reconstruct electron trajectories in the tracker. The electron momentum is estimated by combining the energy measurement in the calorimeter with the momentum measurement in the tracker. Benchmark selection criteria are presented, and their performances assessed using Z, SIC, and J/psi decays into e(+)+e(-) pairs. The spectra of the observables relevant to electron reconstruction and selection as well as their global efficiencies are well reproduced by Monte Carlo simulations. The momentum scale is calibrated with an uncertainty smaller than 0.3%. The momentum resolution for electrons produced in Z boson decays ranges from 1.7 to 4.5%, depending on electron pseudorapidity and energy loss through bremsstrahlung in the detector material.Austrian Federal Ministry of Science, Research and Economy; Austrian Science Fund; Belgian Fonds de la Recherche Scientifique; Fonds voor Wetenschappelijk Onderzoek; CNPq; CAPES; FAPERJ; FAPESP; Bulgarian Ministry of Education and Science; CERN; Chinese Academy of Sciences, Ministry of Science and Technology; National Natural Science Foundation of China; Colombian Funding Agency (COLCIENCIAS); Croatian Ministry of Science, Education and Sport; Croatian Science Foundation; Research Promotion Foundation, Cyprus; Ministry of Education and Research; Estonian Research Council [IUT23-4, IUT23-6]; European Regional Development Fund, Estonia; Academy of Finland; Finnish Ministry of Education and Culture; Helsinki Institute of Physics; Institut National de Physique Nucleaire et de Physique des Particules/CNRS; Commissariat a l'Energie Atomique et aux Energies Alternatives/CEA, France; Bundesministerium fur Bildung und Forschung; Deutsche Forschungsgemeinschaft; Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; General Secretariat for Research and Technology, Greece; National Scientific Research Foundation; National Innovation Office, Hungary; Department of Atomic Energy, India; Department of Science and Technology, India; Institute for Studies in Theoretical Physics and Mathematics, Iran; Science Foundation, Ireland; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Science, ICT and Future Planning; National Research Foundation (NRF), Republic of Korea; Lithuanian Academy of Sciences; Ministry of Education; University of Malaya (Malaysia); CINVESTAV; CONACYT; SEP; UASLP-FAI; Ministry of Business, Innovation and Employment, New Zealand; Pakistan Atomic Energy Commission; Ministry of Science and Higher Education; National Science Centre, Poland; Fundacao para a Ciencia e a Tecnologia, Portugal; JINR, Dubna; Ministry of Education and Science of the Russian Federation; Federal Agency of Atomic Energy of the Russian Federation; Russian Academy of Sciences; Russian Foundation for Basic Research; Ministry of Education, Science and Technological Development of Serbia; Secretaria de Estado de Investigacion, Desarrollo e Innovacion and Programa Consolider-Ingenio, Spain; ETH Board; ETH Zurich; PSI; SNF; UniZH; Canton Zurich; SER; Ministry of Science and Technology, Taipei; Thailand Center of Excellence in Physics; Institute for the Promotion of Teaching Science and Technology of Thailand; Special Task Force for Activating Research and the National Science and Technology Development Agency of Thailand; Scientific and Technical Research Council of Turkey; Turkish Atomic Energy Authority; National Academy of Sciences of Ukraine; State Fund for Fundamental Researches, Ukraine; Science and Technology Facilities Council, U.K.; US Department of Energy; US National Science Foundation; Marie-Curie programme; European Research Council (European Union); EPLANET (European Union); Leventis Foundation; A.P. Sloan Foundation; Alexander von Humboldt Foundation; Belgian Federal Science Policy Office; Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA- Belgium); Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; Council of Science and Industrial Research, India; HOMING PLUS programme of Foundation for Polish Science; European Union; Regional Development Fund; Compagnia di San Paolo (Torino); Consorzio per la Fisica (Trieste); MIUR (Italy) [20108T4XTM]; Thalis programme; Aristeia programme; EU-ESF; Greek NSRF; National Priorities Research Program by Qatar National Research FundSCI(E)ARTICLE1

Sirunyan A. M. - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical stability of the CMS strip tracker measured with a laser alignment system
    'IOP Publishing', 2020
    Co-Authors: Sirunyan A. M., Tumasyan A., Adam W., Asilar E., Bergauer T., Brandstetter J., Brondolin E., Dragicevic M., Ero J., Flechl M.
    Abstract:

    CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO CARLOS CHAGAS FILHO DE AMPARO À PESQUISA DO ESTADO DO RIO DE JANEIRO - FAPERJFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPThe CMS tracker consists of 206m(2) of silicon strip sensors assembled on carbon fibre composite structures and is designed for operation in the temperature range from -25 to + 25 degrees C. The mechanical stability of tracker components during physics operation was monitored with a few mu m resolution using a dedicated laser alignment system as well as particle tracks from cosmic rays and hadron-hadron collisions. During the LHC operational period of 2011-2013 at stable temperatures, the components of the tracker were observed to experience relative movements of less than 30 mu m. In addition, temperature variations were found to cause displacements of tracker structures of about 2 mu m/degrees C, which largely revert to their initial positions when the temperature is restored to its original value.12139CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO CARLOS CHAGAS FILHO DE AMPARO À PESQUISA DO ESTADO DO RIO DE JANEIRO - FAPERJFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPCONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQCOORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO CARLOS CHAGAS FILHO DE AMPARO À PESQUISA DO ESTADO DO RIO DE JANEIRO - FAPERJFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESPSem informaçãoSem informaçãoSem informaçãoSem informaçãoWe congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centres and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: the Austrian Federal Ministry of Science, Research and Economy and the Austrian Science Fund; the Belgian Fonds de la Recherche Scientifique, and Fonds voor Wetenschappelijk Onderzoek; the Brazilian Funding Agencies (CNPq, CAPES, FAPERJ, and FAPESP); the Bulgarian Ministry of Education and Science; CERN; the Chinese Academy of Sciences, Ministry of Science and Technology, and National Natural Science Foundation of China; the Colombian Funding Agency (COLCIENCIAS); the Croatian Ministry of Science, Education and Sport, and the Croatian Science Foundation; the Research Promotion Foundation, Cyprus; the Secretariat for Higher Education, Science, Technology and Innovation, Ecuador; the Ministry of Education and Research, Estonian Research Council via IUT23-4 and IUT23-6 and European Regional Development Fund, Estonia; the Academy of Finland, Finnish Ministry of Education and Culture, and Helsinki Institute of Physics; the Institut National de Physique Nucleaire et de Physique des Particules / CNRS, and Commissariat a l' Energie Atomique et aux Energies Alternatives / CEA, France; the Bundesministerium fur Bildung und Forschung, Deutsche Forschungsgemeinschaft, and Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; the General Secretariat for Research and Technology, Greece; the National Scientific Research Foundation, and National Innovation Office, Hungary; the Department of Atomic Energy and the Department of Science and Technology, India; the Institute for Studies in Theoretical Physics and Mathematics, Iran; the Science Foundation, Ireland; the Istituto Nazionale di Fisica Nucleare, Italy; the Ministry of Science, ICT and Future Planning, and National Research Foundation (NRF), Republic of Korea; the Lithuanian Academy of Sciences; the Ministry of Education, and University of Malaya (Malaysia); the Mexican Funding Agencies (BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI); the Ministry of Business, Innovation and Employment, New Zealand; the Pakistan Atomic Energy Commission; the Ministry of Science and Higher Education and the National Science Centre, Poland; the Fundacao para a Ciencia e a Tecnologia, Portugal; JINR, Dubna; the Ministry of Education and Science of the Russian Federation, the Federal Agency of Atomic Energy of the Russian Federation, Russian Academy of Sciences, the Russian Foundation for Basic Research and the Russian Competitiveness Program of NRNU MEPhI (M.H.U.); the Ministry of Education, Science and Technological Development of Serbia; the Secretaria de Estado de Investigacion, Desarrollo e Innovacion and Programa Consolider-Ingenio 2010, Spain; the Swiss Funding Agencies (ETH Board, ETH Zurich, PSI, SNF, UniZH, Canton Zurich, and SER); the Ministry of Science and Technology, Taipei; the Thailand Center of Excellence in Physics, the Institute for the Promotion of Teaching Science and Technology of Thailand, Special Task Force for Activating Research and the National Science and Technology Development Agency of Thailand; the Scientific and Technical Research Council of Turkey, and Turkish Atomic Energy Authority; the National Academy of Sciences of Ukraine, and State Fund for Fundamental Researches, Ukraine; the Science and Technology Facilities Council, U.K.; the US Department of Energy, and the US National Science Foundation. Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A. P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS programme of the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund, the Mobility Plus programme of the Ministry of Science and Higher Education, the National Science Center (Poland), contracts Harmonia 2014/14/M/ST2/00428, Opus 2014/13/B/ST2/02543, 2014/15/B/ST2/03998, and 2015/19/B/ST2/02861, Sonata-bis 2012/07/E/ST2/01406; the Thalis and Aristeia programmes co-financed by EU-ESF and the Greek NSRF; the National Priorities Research Program by Qatar National Research Fund; the Programa Clarin-COFUND del Principado de Asturias; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University and the Chulalongkorn Academic into Its 2nd Century Project Advancement Project (Thailand); and the Welch Foundation, contract C-1845

  • Relative Modification of Prompt psi(2S) and J/psi Yields from pp to PbPb Collisions at root(S)(NN)=5.02 TeV
    PHYSICAL REVIEW LETTERS, 2017
    Co-Authors: Sirunyan A. M., Tumasyan A., Adam W., Asilar E., Bergauer T., Brandstetter J., Brondolin E., Dragicevic M., Eroe J., Flechl M.
    Abstract:

    The relative modification of the prompt psi(2S) and J/psi yields from pp to PbPb collisions, at the center-of- mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples collected by the CMS experiment at the LHC in 2015, corresponding to integrated luminosities of 28.0 pb(-1) and 464 mu b(-1), respectively. The double ratio of measured yields of prompt charmonia reconstructed through their decays into muon pairs,(N-psi(2S)/N J/psi )(PbPb)/(N-psi((2S))/N (J/psi) )(pp),is determined as a function of PbPb collision centrality and charmonium transverse momentum p(T), in two kinematic intervals: broken vertical bar y vertical bar < 1.6 covering 6.5 < pT < 30 GeV/c and 1.6 < broken vertical bar y vertical bar < 2.4 covering 3 < pT < 30 GeV/c. The centrality-integrated double ratios are 0.36 +/- 0.08(stat) +/- 0.05(syst) in the first interval and 0.24 +/- 0.22(stat) +/- 0.09(syst) in the second. The double ratio is lower than unity in all the measured bins, suggesting that the psi(2S) yield is more suppressed than the J/psi yield in the explored phase space.Bundesministerium fur Wissenschaft, Forschung und Wirtschaft (BMWFW) (Austria); Austrian Science Fund (FWF) (Austria); Belgian Fonds de la Recherche Scientifique (FNRS) (Belgium); Belgian Fonds voor Wetenschappelijk Onderzoek (FWO) (Belgium); Conselho Nacional de Desenvolvimento Cientifico e Tecnelogica (CNPq) (Brazil); Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) (Brazil); Fundacao de Amparo a Pesquisa do Estado de Rio de Janeiro (FAPERJ) (Brazil); Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) (Brazil); Bulgarian Ministry of Education and Science (MES) (Bulgaria); CERN; Chinese Academy of Sciences (CAS) (China); Ministry of Science and Technology (MoST) (China); Chinese National Natural Science Foundation of China (NSFC) (China); Colombian Funding Agency (COLCIENCIAS) (Colombia); Croatian Ministry of Science, Education and Sport (MSES) (Croatia); Croatian Science Foundation (CSF) (Croatia); Research Promotion Foundation (RPF) (Cyprus); Secretaria de Educacion Superior, Ciencia, Tecnologia e Innovacion (SENESCYT) (Ecuador); Ministry of Education and Research (MoER) (Estonia); Estonian Research Council (ERC IUT) (Estonia) [IUT23-4, IUT23-6]; European Regional Development Fund (ERDF) (Estonia); Academy of Finland (Finland); Finnish Ministry of Education and Culture (MEC) (Finland); Helsinki Institute of Physics (HIP) (Finland); Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA) (France); Centre National de la Recherche Scientifique (CNRS)/Institut National de Physique Nucleaire et de Physique des Particules (IN2P3) (France); Bundesministerium fur Bildung und Forschung (BMBF) (Germany); Deutsche Forschungsgemeinschaft (DFG) (Germany); Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF) (Germany); General Secretariat for Research and Technology (GSRT) (Greece); Orszagos Tudomanyos Kutatasi Alapprogramok (OTKA) (Hungary); National Innovation Office (NIH) (Hungary); Department of Atomic Energy (DAE) (India); Department of Science and Technology (DST) (India); Institute for Research in Fundamental Studies (IPM) (Iran); Science Foundation (SFI) (Ireland); Istituto Nazionale di Fisica Nucleare (INFN) (Italy); Korean Ministry of Education, Science and Technology (MSIP) (Republic of Korea); National Research Foundation of Korea (NRF) (Republic of Korea); Lithuanian Academy of Sciences (LAS) (Lithuania); Ministry of Education (MOE) (Malaysia); University of Malaya (UM) (Malaysia); Benemerita Universidad Autonoma de Puebla (BUAP) (Mexico); Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional (CINVESTAV) (Mexico); Consejo Nacional de Ciencia y Tecnologia (CONACYT) (Mexico); Laboratorio Nacional de Supercomputo del Sureste (LNS) (Mexico); Secretaria de Educacion Publica (SEP) (Mexico); Universidad Autonoma de San Luis Potosi (UASLP-FAI) (Mexico); Ministry of Business, Innovation and Employment (MBIE) (New Zealand); Pakistan Atomic Energy Commission (PAEC) (Pakistan); Ministry of Science and Higher Education (MSHE) (Poland); National Science Centre (NSC) (Poland); Fundacao para a Ciencia e a Tecnologia (FCT) (Portugal); Joint Institute for Nuclear Research (JINR) (Dubna); Ministry of Education and Science of the Russian Federation (MON) (Russia); Federal Agency of Atomic Energy of the Russian Federation (RosAtom) (Russia); Russian Academy of Sciences (RAS) (Russia); Russian Foundation for Basic Research (RFBR) (Russia); Ministry of Education, Science and Technological Development of Serbia (MESTD) (Serbia); Secretaria de Estado de Investigacion, Desarrollo e Innovacion (SEIDI) (Spain); Programa ConsoliderIngenio (CPAN) (Spain); Swiss Funding Agencies (Switzerland); Ministry of Science and Technology (MST) (Taipei); Thailand Center of Excellence in Physics (ThEPCenter) (Thailand); Institute for the Promotion of Teaching Science and Technology of Thailand (IPST) (Thailand); Special Task Force for Activating Research (STAR) (Thailand); National Science and Technology Development Agency of Thailand (NSTDA) (Thailand); Scientific and Technical Research Council of Turkey (TUBITAK) (Turkey); Turkish Atomic Energy Authority (TAEK) (Turkey); National Academy of Sciences of Ukraine (NASU) (Ukraine); State Fund for Fundamental Researches (SFFR) (Ukraine); Science and Technology Facilities Council (STFC) (United Kingdom); US Department of Energy (DOE) (USA); US National Science Foundation (NSF) (USA)SCI(E)ARTICLE1611

  • Inclusive search for supersymmetry using razor variables in pp collisions at root s=13 TeV
    PHYSICAL REVIEW D, 2017
    Co-Authors: Sirunyan A. M., Tumasyan A., Adam W., Asilar E., Bergauer T., Brandstetter J., Brondolin E., Dragicevic M., Eroe J.
    Abstract:

    An inclusive search for supersymmetry using razor variables is performed in events with four or more jets and no more than one lepton. The results are based on a sample of proton-proton collisions corresponding to an integrated luminosity of 2.3 fb(-1) collected with the CMS experiment at a center-ofmass energy of s root s = 13 TeV. No significant excess over the background prediction is observed in data, and 95% confidence level exclusion limits are placed on the masses of new heavy particles in a variety of simplified models. Assuming that pair-produced gluinos decay only via three-body processes involving third-generation quarks plus a neutralino, and that the neutralino is the lightest supersymmetric particle with a mass of 200 GeV, gluino masses below 1.6 TeV are excluded for any branching fractions for the individual gluino decay modes. For some specific decay mode scenarios, gluino masses up to 1.65 TeVare excluded. For decays to first-and second-generation quarks and a neutralino with a mass of 200 GeV, gluinos with masses up to 1.4 TeVare excluded. Pair production of top squarks decaying to a top quark and a neutralino with a mass of 100 GeV is excluded for top squark masses up to 750 GeV.Austrian Federal Ministry of Science, Research and Economy; Austrian Science Fund; Belgian Fonds de la Recherche Scientifique; Fonds voor Wetenschappelijk Onderzoek; Brazilian Funding Agency (CNPq); Brazilian Funding Agency (CAPES); Brazilian Funding Agency (FAPERJ); Brazilian Funding Agency (FAPESP); Bulgarian Ministry of Education and Science; CERN; Chinese Academy of Sciences; Ministry of Science and Technology and National Natural Science Foundation of China; Colombian Funding Agency (COLCIENCIAS); Croatian Ministry of Science, Education and Sport; Croatian Science Foundation; Research Promotion Foundation, Cyprus; Ministry of Education and Research, Estonian Research Council [IUT23-4, IUT23-6]; European Regional Development Fund, Estonia; Academy of Finland; Finnish Ministry of Education and Culture; Helsinki Institute of Physics; Institut National de Physique Nucleaire et de Physique des Particules/CNRS, France; Commissariat a l'Energie Atomique et aux Energies Alternatives/CEA, France; Bundesministerium fur Bildung und Forschung, Germany; Deutsche Forschungsgemeinschaft, Germany; Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; General Secretariat for Research and Technology, Greece; National Scientific Research Foundation, Hungary; National Innovation Office, Hungary; Department of Atomic Energy, India; Department of Science and Technology, India; Institute for Studies in Theoretical Physics and Mathematics, Iran; Science Foundation, Ireland; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Science, ICT and Future Planning, Republic of Korea; National Research Foundation, Republic of Korea; Lithuanian Academy of Sciences; Ministry of Education, Malaysia; University of Malaya, Malaysia; Mexican Funding Agency (BUAP); Mexican Funding Agency (CINVESTAV); Mexican Funding Agency (CONACYT); Mexican Funding Agency (LNS); Mexican Funding Agency (SEP); Mexican Funding Agency (UASLP-FAI); Ministry of Business, Innovation and Employment, New Zealand; Pakistan Atomic Energy Commission; Ministry of Science and Higher Education, Poland; National Science Centre, Poland; Fundacao para a Ciencia e a Tecnologia, Portugal; Joint Institute for Nunclear Research in Dubna; Ministry of Education and Science of the Russian Federation; Federal Agency of Atomic Energy of the Russian Federation; Russian Academy of Sciences; Russian Foundation for Basic Research; Ministry of Education, Science and Technological Development of Serbia; Secretaria de Estado de Investigacion, Spain; Desarrollo e Innovacion and Programa Consolider-Ingenio, Spain; Swiss Funding Agency (ETH Board); Swiss Funding Agency (ETH Zurich); Swiss Funding Agency (PSI); Swiss Funding Agency (SNF); Swiss Funding Agency (UniZH); Swiss Funding Agency (Canton Zurich); Swiss Funding Agency (SER); Ministry of Science and Technology, Taiwan; Thailand Center of Excellence in Physics; Institute for the Promotion of Teaching Science and Technology of Thailand; Special Task Force for Activating Research; National Science and Technology Development Agency of Thailand; Scientific and Technical Research Council of Turkey; Turkish Atomic Energy Authority; National Academy of Sciences of Ukraine; State Fund for Fundamental Researches; Science and Technology Facilities Council, UK; US Department of Energy; US National Science Foundation; Marie-Curie program; European Research Council; EPLANET; European Union; Leventis Foundation; A.P. Sloan Foundation; Alexander von Humboldt Foundation; Belgian Federal Science Policy Office; Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture, Belgium; Agentschap voor Innovatie door Wetenschap en Technologie, Belgium; Ministry of Education, Youth and Sports of the Czech Republic; Council of Science and Industrial Research, India; HOMING PLUS program of the Foundation for Polish Science; European Union, Regional Development Fund; Mobility Plus program of the Ministry of Science and Higher Education, Poland; OPUS program of the National Science Center, Poland; Thalis program; Aristeia program; EU-ESF; Greek NSRF; National Priorities Research Program by Qatar National Research Fund; Programa Clarin-COFUND del Principado de Asturias; Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University, Thailand; Chulalongkorn Academic into Its 2nd Century Project Advancement Project, Thailand; Welch Foundation [C-1845]SCI(E)ARTICLE19

  • Search for dark matter particles in proton-proton collisions at root 8 = TeV using the razor variables
    JOURNAL OF HIGH ENERGY PHYSICS, 2016
    Co-Authors: Sirunyan A. M., Tumasyan A., Adam W., Asilar E., Bergauer T., Brandstetter J., Brondolin E., Dragicevic M., Eroe J.
    Abstract:

    A search for dark matter particles directly produced in proton-proton collisions recorded by the CMS experiment at the LHC is presented. The data correspond to an integrated luminosity of 18.8 fb(-1), at a center-of-mass energy of 8 TeV. The event selection requires at least two jets and no isolated leptons. The razor variables are used to quantify the transverse momentum balance in the jet momenta. The study is performed separately for events with and without jets originating from b quarks. The observed yields are consistent with the expected backgrounds and, depending on the nature of the production mechanism, dark matter production at the LHC is excluded at 90% confidence level for a mediator mass scale I > below 1 TeV. The use of razor variables yields results that complement those previously published.Austrian Federal Ministry of Science, Research and Economy; Austrian Science Fund; Belgian Fonds de la Recherche Scientifique; Fonds voor Wetenschappelijk Onderzoek; CNPq; CAPES; FAPERJ; FAPESP; Bulgarian Ministry of Education and Science; CERN; Chinese Academy of Sciences; Ministry of Science and Technology; National Natural Science Foundation of China; Colombian Funding Agency (COLCIENCIAS); Croatian Ministry of Science, Education and Sport; Croatian Science Foundation; Research Promotion Foundation, Cyprus; Ministry of Education and Research; Estonian Research Council [IUT23-4, IUT23-6]; European Regional Development Fund, Estonia; Academy of Finland; Finnish Ministry of Education and Culture; Helsinki Institute of Physics; Institut National de Physique Nucleaire et de Physique des Particules / CNRS; Commissariat a l'Energie Atomique et aux Energies Alternatives / CEA, France; Bundesministerium fur Bildung und Forschung, Germany; Deutsche Forschungsgemeinschaft, Germany; Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; General Secretariat for Research and Technology, Greece; National Scientific Research Foundation, Hungary; National Innovation Office, Hungary; Department of Atomic Energy, India; Department of Science and Technology, India; Institute for Studies in Theoretical Physics and Mathematics, Iran; Science Foundation, Ireland; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Science, ICT and Future Planning, Republic of Korea; National Research Foundation (NRF), Republic of Korea; Lithuanian Academy of Sciences; Ministry of Education (Malaysia); University of Malaya (Malaysia); CINVESTAV; CONACYT; SEP; UASLP-FAI; Ministry of Business, Innovation and Employment, New Zealand; Pakistan Atomic Energy Commission; Ministry of Science and Higher Education, Poland; National Science Center, Poland; Fundacao para a Ciencia e a Tecnologia, Portugal; JINR, Dubna; Ministry of Education and Science of the Russian Federation; Federal Agency of Atomic Energy of the Russian Federation; Russian Academy of Sciences; Russian Foundation for Basic Research; Ministry of Education, Science and Technological Development of Serbia; Secretaria de Estado de Investigacion, Desarrollo e Innovacion; Programa Consolider-Ingenio, Spain; ETH Board; ETH Zurich; PSI; SNF; UniZH; Canton Zurich; SER; Ministry of Science and Technology, Taipei; Thailand Center of Excellence in Physics; Institute for the Promotion of Teaching Science and Technology of Thailand; Special Task Force for Activating Research; National Science and Technology Development Agency of Thailand; Scientific and Technical Research Council of Turkey; Turkish Atomic Energy Authority; National Academy of Sciences of Ukraine; State Fund for Fundamental Researches, Ukraine; Science and Technology Facilities Council, U.K; US Department of Energy; US National Science FoundationSCI(E)ARTICLE1

  • Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at root s=8 TeV
    JOURNAL OF INSTRUMENTATION, 2015
    Co-Authors: Sirunyan A. M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Eroe J., Friedl M., Fruehwirth R., Ghete V. M.
    Abstract:

    The performance and strategies used in electron reconstruction and selection at CMS are presented based on data corresponding to an integrated luminosity of 19.7 fb(-1), collected in proton-proton collisions at root s = 8TeV at the CERN LHC. The paper focuses on prompt isolated electrons with transverse momenta ranging from about 5 to a few 100 GeV. A detailed description is given of the algorithms used to cluster energy in the electromagnetic calorimeter and to reconstruct electron trajectories in the tracker. The electron momentum is estimated by combining the energy measurement in the calorimeter with the momentum measurement in the tracker. Benchmark selection criteria are presented, and their performances assessed using Z, SIC, and J/psi decays into e(+)+e(-) pairs. The spectra of the observables relevant to electron reconstruction and selection as well as their global efficiencies are well reproduced by Monte Carlo simulations. The momentum scale is calibrated with an uncertainty smaller than 0.3%. The momentum resolution for electrons produced in Z boson decays ranges from 1.7 to 4.5%, depending on electron pseudorapidity and energy loss through bremsstrahlung in the detector material.Austrian Federal Ministry of Science, Research and Economy; Austrian Science Fund; Belgian Fonds de la Recherche Scientifique; Fonds voor Wetenschappelijk Onderzoek; CNPq; CAPES; FAPERJ; FAPESP; Bulgarian Ministry of Education and Science; CERN; Chinese Academy of Sciences, Ministry of Science and Technology; National Natural Science Foundation of China; Colombian Funding Agency (COLCIENCIAS); Croatian Ministry of Science, Education and Sport; Croatian Science Foundation; Research Promotion Foundation, Cyprus; Ministry of Education and Research; Estonian Research Council [IUT23-4, IUT23-6]; European Regional Development Fund, Estonia; Academy of Finland; Finnish Ministry of Education and Culture; Helsinki Institute of Physics; Institut National de Physique Nucleaire et de Physique des Particules/CNRS; Commissariat a l'Energie Atomique et aux Energies Alternatives/CEA, France; Bundesministerium fur Bildung und Forschung; Deutsche Forschungsgemeinschaft; Helmholtz-Gemeinschaft Deutscher Forschungszentren, Germany; General Secretariat for Research and Technology, Greece; National Scientific Research Foundation; National Innovation Office, Hungary; Department of Atomic Energy, India; Department of Science and Technology, India; Institute for Studies in Theoretical Physics and Mathematics, Iran; Science Foundation, Ireland; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Science, ICT and Future Planning; National Research Foundation (NRF), Republic of Korea; Lithuanian Academy of Sciences; Ministry of Education; University of Malaya (Malaysia); CINVESTAV; CONACYT; SEP; UASLP-FAI; Ministry of Business, Innovation and Employment, New Zealand; Pakistan Atomic Energy Commission; Ministry of Science and Higher Education; National Science Centre, Poland; Fundacao para a Ciencia e a Tecnologia, Portugal; JINR, Dubna; Ministry of Education and Science of the Russian Federation; Federal Agency of Atomic Energy of the Russian Federation; Russian Academy of Sciences; Russian Foundation for Basic Research; Ministry of Education, Science and Technological Development of Serbia; Secretaria de Estado de Investigacion, Desarrollo e Innovacion and Programa Consolider-Ingenio, Spain; ETH Board; ETH Zurich; PSI; SNF; UniZH; Canton Zurich; SER; Ministry of Science and Technology, Taipei; Thailand Center of Excellence in Physics; Institute for the Promotion of Teaching Science and Technology of Thailand; Special Task Force for Activating Research and the National Science and Technology Development Agency of Thailand; Scientific and Technical Research Council of Turkey; Turkish Atomic Energy Authority; National Academy of Sciences of Ukraine; State Fund for Fundamental Researches, Ukraine; Science and Technology Facilities Council, U.K.; US Department of Energy; US National Science Foundation; Marie-Curie programme; European Research Council (European Union); EPLANET (European Union); Leventis Foundation; A.P. Sloan Foundation; Alexander von Humboldt Foundation; Belgian Federal Science Policy Office; Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA- Belgium); Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; Council of Science and Industrial Research, India; HOMING PLUS programme of Foundation for Polish Science; European Union; Regional Development Fund; Compagnia di San Paolo (Torino); Consorzio per la Fisica (Trieste); MIUR (Italy) [20108T4XTM]; Thalis programme; Aristeia programme; EU-ESF; Greek NSRF; National Priorities Research Program by Qatar National Research FundSCI(E)ARTICLE1