The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Johann Rafelski - One of the best experts on this subject based on the ideXlab platform.
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Hadron production and quark gluon plasma Hadronization in pb pb collisions at sqrt s_ nn 2 76 tev
Physical Review C, 2013Co-Authors: Jean Letessier, Michal Petraň, V Petracek, Johann RafelskiAbstract:We show that all central rapidity Hadron yields measured in Pb--Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV are well described by the chemical non-equilibrium statistical Hadronization model (SHM), where the chemically equilibrated QGP source breaks up directly into Hadrons. SHM parameters are obtained as a function of centrality of colliding ions, and we compare CERN Large Hadron Collider (LHC) with Brookhaven National Laboratory Relativistic Heavy Ion Collider (RHIC) results. We predict yields of unobserved Hadrons and address anti-matter production. The physical properties of the quark--gluon plasma fireball particle source show universality of Hadronization conditions at LHC and RHIC.
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strangeness production in au au collisions at sqrt s_ nn 62 4 gev
arXiv: High Energy Physics - Phenomenology, 2011Co-Authors: Jean Letessier, Michal Petran, Vojtech Petracek, Johann RafelskiAbstract:We obtain strangeness production as function of centrality in a statistical Hadronization model analysis of all experimental Hadron production data in Au--Au collisions at $\sqrt{s_{NN}}=62.4\GeV$. Our analysis describes successfully the yield of strange and multi-strange Hadrons recently published. We explore condition of Hadronization as a function of centrality and find universality for the case of chemical non-equilibrium in the Hadron phase space corresponding to quark--gluon plasma (QGP) in chemical equilibrium.
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Hadron production and phase changes in relativistic heavy ion collisions
European Physical Journal A, 2008Co-Authors: Jean Letessier, Johann RafelskiAbstract:We study soft Hadron production in relativistic heavy-ion collisions in a wide range of reaction energy, 4.8 GeV \( \sqrt{{s_{{\rm NN}}}}\)≥200 GeV, we use continuity of particle yields and statistical parameters to predict the Hadron production at \( \sqrt{{s_{{\rm NN}}}}\) = 62.4 GeV, and obtain total yields of Hadrons at \( \sqrt{{s_{{\rm NN}}}}\) = 130 GeV. We consider, in depth, the pattern we uncover within the Hadronization condition, and discuss possible mechanisms associated with the identified rapid change in system properties at \( \sqrt{{s_{{\rm NN}}^{{\rm cr}}}}\) . We propose that the chemically over-saturated 2 + 1 flavor Hadron matter system undergoes a 1st-order phase transition.
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Hadrons and quark gluon plasma
2002Co-Authors: Jean Letessier, Johann RafelskiAbstract:Part I. A New Phase of Matter?: 1. Micro-bang: big bang in the laboratory 2. Hadrons 3. Vacuum as a physical medium 4. Statistical properties of Hadronic matter Part II. Analysis Tools and Experiments: 5. Nuclei in collision 6. Understanding collision dynamics 7. Entropy and its relevance in heavy ion collisions Part III. Particle Production: 8. Particle spectra 9. Highlights of Hadron production Part IV. Hot Hadronic Matter: 10. Relativistic gas 11. First look at Hadronic gas 12. Hagedorn gas Part V. QCD, Hadronic Structure and High Temperature: 13. Hadronic structure and quantum chromodynamics 14. Perturbative QCD 15. Lattice quantum chromodynamics 16. Perturbative quark-gluon plasma Part VI. Strangeness: 17. Thermal flavor production in deconfined phase 18. Strangeness background 19. Hadron freeze-out analysis.
L Bravina - One of the best experts on this subject based on the ideXlab platform.
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relativistic Hadron Hadron collisions in the ultra relativistic quantum molecular dynamics model urqmd
arXiv: High Energy Physics - Phenomenology, 1999Co-Authors: Marcus Bleicher, E Zabrodin, C Spieles, S Soff, L Bravina, Steffen A Bass, C. Ernst, M Belkacem, H Weber, H StockerAbstract:Hadron-Hadron collisions at high energies are investigated in the Ultra-relativistic-Quantum-Molecular-Dynamics approach (UrQMD). This microscopic transport model is designed to study pp, pA and A+A collisions. It describes the phenomenology of Hadronic interactions at low and intermediate energies ($\sqrt s 5$ GeV, the excitation of color strings and their subsequent fragmentation into Hadrons dominates the multiple production of particles in the UrQMD model. The model shows a fair overall agreement with a large body of experimental h-h data over a wide range of h-h center-of-mass energies. Hadronic reaction data with higher precision would be useful to support the use of the UrQMD model for relativistic heavy ion collisions.
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relativistic Hadron Hadron collisions in the ultra relativistic quantum molecular dynamics model
Journal of Physics G, 1999Co-Authors: Marcus Bleicher, E Zabrodin, C Spieles, S Soff, L Bravina, Steffen A Bass, C. ErnstAbstract:Hadron-Hadron (h-h) collisions at high energies are investigated in the ultra-relativistic quantum molecular dynamics (UrQMD) approach. This microscopic transport model describes the phenomenology of Hadronic interactions at low and intermediate energies ( 5 GeV, the excitation of colour strings and their subsequent fragmentation into Hadrons dominates the multiple production of particles in the UrQMD model. The model shows a fair overall agreement with a large body of experimental h-h data over a wide range of h-h centre-of-mass energies. Hadronic reaction data with higher precision would be useful to support the use of the UrQMD model for relativistic heavy-ion collisions.
Albert M Sirunyan - One of the best experts on this subject based on the ideXlab platform.
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Studies of charm and beauty Hadron long-range correlations in pp and pPb collisions at LHC energies
Phys.Lett.B, 2021Co-Authors: Albert M Sirunyan, Tobias Bergauer, Armen Tumasyan, Marko Dragicevic, Martin Flechl, Wolfgang Adam, Federico Ambrogi, Janos Erö, Alberto Escalante Del Valle, Rudolf FruehwirthAbstract:Measurements of the second Fourier harmonic coefficient ( v2 ) of the azimuthal distributions of prompt and nonprompt D 0 mesons produced in pp and pPb collisions are presented. Nonprompt D 0 mesons come from beauty Hadron decays. The data samples are collected by the CMS experiment at nucleon-nucleon center-of-mass energies of 13 and 8.16 TeV, respectively. In high multiplicity pp collisions, v2 signals for prompt charm Hadrons are reported for the first time, and are found to be comparable to those for light-flavor Hadron species over a transverse momentum ( pT ) range of 2–6 GeV. Compared at similar event multiplicities, the prompt D 0 meson v2 values in pp and pPb collisions are similar in magnitude. The v2 values for open beauty Hadrons are extracted for the first time via nonprompt D 0 mesons in pPb collisions. For pT in the range of 2–5 GeV, the results suggest that v2 for nonprompt D 0 mesons is smaller than that for prompt D 0 mesons. These new measurements indicate a positive charm Hadron v2 in pp collisions and suggest a mass dependence in v2 between charm and beauty Hadrons in the pPb system. These results provide insights into the origin of heavy-flavor quark collectivity in small systems.
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pseudorapidity distributions of charged Hadrons in xenon xenon collisions at snn 5 44 tev
Physics Letters B, 2019Co-Authors: Albert M Sirunyan, Robin Erbacher, C Carrillo A Montoya, Wagner Carvalho, Maciej Gorski, Danek Kotlinski, Balazs Ujvari, Sertac Ozturk, S Muthumuni, Richard LanderAbstract:Abstract Measurements of the pseudorapidity distributions of charged Hadrons produced in xenon-xenon collisions at a nucleon-nucleon centre-of-mass energy of s NN = 5.44 TeV are presented. The measurements are based on data collected by the CMS experiment at the LHC. The yield of primary charged Hadrons produced in xenon-xenon collisions in the pseudorapidity range | η | 3.2 is determined using the silicon pixel detector in the CMS tracking system. For the 5% most central collisions, the charged-Hadron pseudorapidity density in the midrapidity region | η | 0.5 is found to be 1187 ± 36 (syst) , with a negligible statistical uncertainty. The rapidity distribution of charged Hadrons is also presented in the range | y | 3.2 and is found to be independent of rapidity around y = 0 . Existing Monte-Carlo event generators are unable to simultaneously describe both results. Comparisons of charged-Hadron multiplicities between xenon-xenon and lead-lead collisions at similar collision energies show that particle production at midrapidity is strongly dependent on the collision geometry in addition to the system size and collision energy.
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pseudorapidity distributions of charged Hadrons in xenon xenon collisions at snn 5 44 tev
Physics Letters B, 2019Co-Authors: Albert M Sirunyan, Robin Erbacher, C Carrillo A Montoya, Wagner Carvalho, Maciej Gorski, Danek Kotlinski, Balazs Ujvari, Sertac Ozturk, S Muthumuni, Richard LanderAbstract:Abstract Measurements of the pseudorapidity distributions of charged Hadrons produced in xenon-xenon collisions at a nucleon-nucleon centre-of-mass energy of s NN = 5.44 TeV are presented. The measurements are based on data collected by the CMS experiment at the LHC. The yield of primary charged Hadrons produced in xenon-xenon collisions in the pseudorapidity range | η | 3.2 is determined using the silicon pixel detector in the CMS tracking system. For the 5% most central collisions, the charged-Hadron pseudorapidity density in the midrapidity region | η | 0.5 is found to be 1187 ± 36 (syst) , with a negligible statistical uncertainty. The rapidity distribution of charged Hadrons is also presented in the range | y | 3.2 and is found to be independent of rapidity around y = 0 . Existing Monte-Carlo event generators are unable to simultaneously describe both results. Comparisons of charged-Hadron multiplicities between xenon-xenon and lead-lead collisions at similar collision energies show that particle production at midrapidity is strongly dependent on the collision geometry in addition to the system size and collision energy.
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pseudorapidity distributions of charged Hadrons in proton lead collisions at s n n 5 02 sqrt s_ mathrm nn 5 02 and 8 16 tev
Journal of High Energy Physics, 2018Co-Authors: Albert M Sirunyan, Jürgen Brandstetter, Fabio Ambrogi, E Brondolin, Tobias Bergauer, Armen Tumasyan, Ece Asilar, Marko Dragicevic, Waldemar Adam, Martin FlechlAbstract:The pseudorapidity distributions of charged Hadrons in proton-lead collisions at nucleon-nucleon center-of-mass energies $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 8.16 TeV are presented. The measurements are based on data samples collected by the CMS experiment at the LHC. The number of primary charged Hadrons produced in non-single-diffractive proton-lead collisions is determined in the pseudorapidity range |ηlab| < 2.4. The charged-Hadron multiplicity distributions are compared to the predictions from theoretical calculations and Monte Carlo event generators. In the center-of-mass pseudorapidity range |ηcm| < 0.5, the average charged-Hadron multiplicity densities 〈dNch/dηcm〉|ηcm| < 0.5 are 17.31 ± 0.01 (stat) ± 0.59 (syst) and 20.10 ± 0.01 (stat) ± 0.85(syst) at $$ \sqrt{s_{\mathrm{NN}}}=5.02 $$ and 8.16 TeV, respectively. The particle densities per participant nucleon are compared to similar measurements in proton-proton, proton-nucleus, and nucleus-nucleus collisions.
E Zabrodin - One of the best experts on this subject based on the ideXlab platform.
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relativistic Hadron Hadron collisions in the ultra relativistic quantum molecular dynamics model urqmd
arXiv: High Energy Physics - Phenomenology, 1999Co-Authors: Marcus Bleicher, E Zabrodin, C Spieles, S Soff, L Bravina, Steffen A Bass, C. Ernst, M Belkacem, H Weber, H StockerAbstract:Hadron-Hadron collisions at high energies are investigated in the Ultra-relativistic-Quantum-Molecular-Dynamics approach (UrQMD). This microscopic transport model is designed to study pp, pA and A+A collisions. It describes the phenomenology of Hadronic interactions at low and intermediate energies ($\sqrt s 5$ GeV, the excitation of color strings and their subsequent fragmentation into Hadrons dominates the multiple production of particles in the UrQMD model. The model shows a fair overall agreement with a large body of experimental h-h data over a wide range of h-h center-of-mass energies. Hadronic reaction data with higher precision would be useful to support the use of the UrQMD model for relativistic heavy ion collisions.
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relativistic Hadron Hadron collisions in the ultra relativistic quantum molecular dynamics model
Journal of Physics G, 1999Co-Authors: Marcus Bleicher, E Zabrodin, C Spieles, S Soff, L Bravina, Steffen A Bass, C. ErnstAbstract:Hadron-Hadron (h-h) collisions at high energies are investigated in the ultra-relativistic quantum molecular dynamics (UrQMD) approach. This microscopic transport model describes the phenomenology of Hadronic interactions at low and intermediate energies ( 5 GeV, the excitation of colour strings and their subsequent fragmentation into Hadrons dominates the multiple production of particles in the UrQMD model. The model shows a fair overall agreement with a large body of experimental h-h data over a wide range of h-h centre-of-mass energies. Hadronic reaction data with higher precision would be useful to support the use of the UrQMD model for relativistic heavy-ion collisions.
Jean Letessier - One of the best experts on this subject based on the ideXlab platform.
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Hadron production and quark gluon plasma Hadronization in pb pb collisions at sqrt s_ nn 2 76 tev
Physical Review C, 2013Co-Authors: Jean Letessier, Michal Petraň, V Petracek, Johann RafelskiAbstract:We show that all central rapidity Hadron yields measured in Pb--Pb collisions at $\sqrt{s_{NN}}=2.76$ TeV are well described by the chemical non-equilibrium statistical Hadronization model (SHM), where the chemically equilibrated QGP source breaks up directly into Hadrons. SHM parameters are obtained as a function of centrality of colliding ions, and we compare CERN Large Hadron Collider (LHC) with Brookhaven National Laboratory Relativistic Heavy Ion Collider (RHIC) results. We predict yields of unobserved Hadrons and address anti-matter production. The physical properties of the quark--gluon plasma fireball particle source show universality of Hadronization conditions at LHC and RHIC.
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strangeness production in au au collisions at sqrt s_ nn 62 4 gev
arXiv: High Energy Physics - Phenomenology, 2011Co-Authors: Jean Letessier, Michal Petran, Vojtech Petracek, Johann RafelskiAbstract:We obtain strangeness production as function of centrality in a statistical Hadronization model analysis of all experimental Hadron production data in Au--Au collisions at $\sqrt{s_{NN}}=62.4\GeV$. Our analysis describes successfully the yield of strange and multi-strange Hadrons recently published. We explore condition of Hadronization as a function of centrality and find universality for the case of chemical non-equilibrium in the Hadron phase space corresponding to quark--gluon plasma (QGP) in chemical equilibrium.
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Hadron production and phase changes in relativistic heavy ion collisions
European Physical Journal A, 2008Co-Authors: Jean Letessier, Johann RafelskiAbstract:We study soft Hadron production in relativistic heavy-ion collisions in a wide range of reaction energy, 4.8 GeV \( \sqrt{{s_{{\rm NN}}}}\)≥200 GeV, we use continuity of particle yields and statistical parameters to predict the Hadron production at \( \sqrt{{s_{{\rm NN}}}}\) = 62.4 GeV, and obtain total yields of Hadrons at \( \sqrt{{s_{{\rm NN}}}}\) = 130 GeV. We consider, in depth, the pattern we uncover within the Hadronization condition, and discuss possible mechanisms associated with the identified rapid change in system properties at \( \sqrt{{s_{{\rm NN}}^{{\rm cr}}}}\) . We propose that the chemically over-saturated 2 + 1 flavor Hadron matter system undergoes a 1st-order phase transition.
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Hadrons and quark gluon plasma
2002Co-Authors: Jean Letessier, Johann RafelskiAbstract:Part I. A New Phase of Matter?: 1. Micro-bang: big bang in the laboratory 2. Hadrons 3. Vacuum as a physical medium 4. Statistical properties of Hadronic matter Part II. Analysis Tools and Experiments: 5. Nuclei in collision 6. Understanding collision dynamics 7. Entropy and its relevance in heavy ion collisions Part III. Particle Production: 8. Particle spectra 9. Highlights of Hadron production Part IV. Hot Hadronic Matter: 10. Relativistic gas 11. First look at Hadronic gas 12. Hagedorn gas Part V. QCD, Hadronic Structure and High Temperature: 13. Hadronic structure and quantum chromodynamics 14. Perturbative QCD 15. Lattice quantum chromodynamics 16. Perturbative quark-gluon plasma Part VI. Strangeness: 17. Thermal flavor production in deconfined phase 18. Strangeness background 19. Hadron freeze-out analysis.