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S Dymov - One of the best experts on this subject based on the ideXlab platform.
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measurement of Deuteron carbon vector analyzing powers in the kinetic energy range 170 380 mev
European Physical Journal A, 2020Co-Authors: F Muller, M żurek, Z Bagdasarian, L Barion, Martin Berz, I Ciepal, G Ciullo, S DymovAbstract:A measurement of vector analyzing powers in elastic Deuteron-carbon scattering has been performed at the Cooler Synchrotron COSY of Forschungszentrum Julich, Germany. Seven kinetic beam energies between 170 and 380 MeV have been used. A vector-polarized beam from a polarized Deuteron source was injected, accelerated to the final desired energy and stored in COSY. A thin needle-shaped diamond strip was used as a carbon target, onto which the beam was slowly steered. Elastically scattered Deuterons were identified in the forward direction using various layers of scintillators and straw tubes. Where data exist in the literature (at 200 and 270 MeV), excellent agreement of the angular shape was found. The beam polarization of the presented data was deduced by fitting the absolute scale of the analyzing power to these references. Our results extend the world data set and are necessary for polarimetry of future electric dipole moment searches at storage rings. They will as well serve as an input for theoretical description of polarized hadron-hadron scattering.
F Muller - One of the best experts on this subject based on the ideXlab platform.
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measurement of Deuteron carbon vector analyzing powers in the kinetic energy range 170 380 mev
European Physical Journal A, 2020Co-Authors: F Muller, M żurek, Z Bagdasarian, L Barion, Martin Berz, I Ciepal, G Ciullo, S DymovAbstract:A measurement of vector analyzing powers in elastic Deuteron-carbon scattering has been performed at the Cooler Synchrotron COSY of Forschungszentrum Julich, Germany. Seven kinetic beam energies between 170 and 380 MeV have been used. A vector-polarized beam from a polarized Deuteron source was injected, accelerated to the final desired energy and stored in COSY. A thin needle-shaped diamond strip was used as a carbon target, onto which the beam was slowly steered. Elastically scattered Deuterons were identified in the forward direction using various layers of scintillators and straw tubes. Where data exist in the literature (at 200 and 270 MeV), excellent agreement of the angular shape was found. The beam polarization of the presented data was deduced by fitting the absolute scale of the analyzing power to these references. Our results extend the world data set and are necessary for polarimetry of future electric dipole moment searches at storage rings. They will as well serve as an input for theoretical description of polarized hadron-hadron scattering.
Shreyasi Acharya - One of the best experts on this subject based on the ideXlab platform.
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jet associated Deuteron production in pp collisions at s 13 tev
Physics Letters B, 2021Co-Authors: Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Michelangelo Agnello, Zubayer Ahammed, N Agrawal, S Ahmad, Aglieri G Rinella, Sang Un AhnAbstract:Author(s): Acharya, S; Adamova, D; Adler, A; Adolfsson, J; Aglieri Rinella, G; Agnello, M; Agrawal, N; Ahammed, Z; Ahmad, S; Ahn, SU; Akbar, Z; Akindinov, A; Al-Turany, M; Albuquerque, DSD; Aleksandrov, D; Alessandro, B; Alfanda, HM; Alfaro Molina, R; Ali, B; Ali, Y; Alici, A; Alizadehvandchali, N; Alkin, A; Alme, J; Alt, T; Altenkamper, L; Altsybeev, I; Anaam, MN; Andrei, C; Andreou, D; Andronic, A; Angeletti, M; Anguelov, V; Anticic, T; Antinori, F; Antonioli, P; Apadula, N; Aphecetche, L; Appelshauser, H; Arcelli, S; Arnaldi, R; Arratia, M; Arsene, IC; Arslandok, M; Augustinus, A; Averbeck, R; Aziz, S; Azmi, MD; Badala, A; Baek, YW; Bai, X; Bailhache, R; Bala, R; Balbino, A; Baldisseri, A; Ball, M; Banerjee, D; Barbera, R; Barioglio, L; Barlou, M; Barnafoldi, GG; Barnby, LS; Barret, V; Bartels, C; Barth, K; Bartsch, E; Baruffaldi, F; Bastid, N; Basu, S; Batigne, G; Batyunya, B; Bauri, D; Bazo Alba, JL; Bearden, IG; Beattie, C; Belikov, I; Bell Hechavarria, ADC; Bellini, F; Bellwied, R; Belokurova, S; Belyaev, V; Bencedi, G; Beole, S; Bercuci, A; Berdnikov, Y | Abstract: Deuteron production in high-energy collisions is sensitive to the space–time evolution of the collision system, and is typically described by a coalescence mechanism. For the first time, we present results on jet-associated Deuteron production in pp collisions at s=13 TeV, providing an opportunity to test the established picture for Deuteron production in events with a hard scattering. Using a trigger particle with high transverse-momentum (pTg5 GeV/c) as a proxy for the presence of a jet at midrapidity, we observe a measurable population of Deuterons being produced around the jet proxy. The associated Deuteron yield measured in a narrow angular range around the trigger particle differs by 2.4–4.8 standard deviations from the uncorrelated background. The data are described by PYTHIA model calculations featuring baryon coalescence.
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Jet-associated Deuteron production in pp collisions at $\sqrt{s}=13$ TeV
2020Co-Authors: Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, Michelangelo Agnello, Zubayer Ahammed, Neelima Agrawal, Shakeel Ahmad, Sang Un AhnAbstract:Deuteron production in high-energy collisions is sensitive to the space-time evolution of the collision system, and is typically described by a coalescence mechanism. For the first time, we present results on jet-associated Deuteron production in \pp\ collisions at $\sqrt{s}=13$ TeV, providing an opportunity to test the established picture for Deuteron production in events with a hard scattering. Using a trigger particle with high transverse-momentum ($p_{\rm T}>5$ GeV/$c$) as a proxy for the presence of a jet at midrapidity, we observe a measurable population of Deuterons being produced around the jet proxy. The associated Deuteron yield measured in a narrow angular range around the trigger particle differs by 2.4-4.8 standard deviations from the uncorrelated background. The data are described by PYTHIA model calculations featuring baryon coalescence.
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anti Deuteron production in pp collisions at s 13tev
European Physical Journal C, 2020Co-Authors: Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Michelangelo Agnello, Zubayer Ahammed, M M Aggarwal, N Agrawal, Aglieri G Rinella, S AhmadAbstract:The study of (anti-)Deuteron production in pp collisions has proven to be a powerful tool to investigate the formation mechanism of loosely bound states in high-energy hadronic collisions. In this paper the production of $\text {(anti-)Deuterons}$ is studied as a function of the charged particle multiplicity in inelastic pp collisions at $\sqrt{s}=13$ TeV using the ALICE experiment. Thanks to the large number of accumulated minimum bias events, it has been possible to measure (anti-)Deuteron production in pp collisions up to the same charged particle multiplicity (${\mathrm {d} N_{ch}/\mathrm {d} \eta } \sim 26$) as measured in p–Pb collisions at similar centre-of-mass energies. Within the uncertainties, the Deuteron yield in pp collisions resembles the one in p–Pb interactions, suggesting a common formation mechanism behind the production of light nuclei in hadronic interactions. In this context the measurements are compared with the expectations of coalescence and statistical hadronisation models (SHM).
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multiplicity dependence of anti Deuteron production in pp collisions at s 7 tev
Physics Letters B, 2019Co-Authors: Shreyasi Acharya, Dagmar Adamova, Jonatan Adolfsson, Michelangelo Agnello, M M Aggarwal, Gianluca Aglieri Rinella, Fernando Torales Acosta, Souvik Priyam Adhya, C Adler, Zubayer AhammedAbstract:In this letter, the production of Deuterons and anti-Deuterons in pp collisions at √s=7 TeV is studied as a function of the charged-particle multiplicity density at mid-rapidity with the ALICE detector at the LHC. Production yields are measured at mid-rapidity in five multiplicity classes and as a function of the Deuteron transverse momentum (pT). The measurements are discussed in the context of hadron-coalescence models. The coalescence parameter B2, extracted from the measured spectra of (anti-)Deuterons and primary (anti-)protons, exhibits no significant pT-dependence for pT < 3 GeV/c, in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the B2 parameter is found to decrease smoothly from low multiplicity pp Pb-Pb collisions, in qualitative agreement with more elaborate coalescence models. The measured mean transverse momentum of (anti-)Deuterons in pp is not reproduced by the Blast-Wave model calculations that simultaneously describe pion, kaon and proton spectra, in contrast to central Pb-Pb collisions. The ratio between the pT-integrated yield of Deuterons to protons, d/p, is found to increase with the charged-particle multiplicity, as observed in inelastic pp collisions at different centre-of-mass energies. The d/p ratios are reported in a wide range, from the lowest to the highest multiplicity values measured in pp collisions at the LHC.
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production of Deuterons tritons he 3 nuclei and their antinuclei in pp collisions at s 0 9 2 76 and 7 tev
Physical Review C, 2018Co-Authors: Shreyasi Acharya, Dagmar Adamova, Jonatan Adolfsson, Michelangelo Agnello, Zubayer Ahammed, J Adam, M M Aggarwal, Gianluca Aglieri Rinella, N Agrawal, S AhmadAbstract:Invariant differential yields of Deuterons and antiDeuterons in pp collisions at s = 0.9, 2.76 and 7 TeV and the yields of tritons, He3 nuclei, and their antinuclei at s = 7 TeV have been measured with the ALICE detector at the CERN Large Hadron Collider. The measurements cover a wide transverse momentum (pT) range in the rapidity interval |y|<0.5, extending both the energy and the pT reach of previous measurements up to 3 GeV/c for A=2 and 6 GeV/c for A=3. The coalescence parameters of (anti)Deuterons and He¯3 nuclei exhibit an increasing trend with pT and are found to be compatible with measurements in pA collisions at low pT and lower energies. The integrated yields decrease by a factor of about 1000 for each increase of the mass number with one (anti)nucleon. Furthermore, the Deuteron-to-proton ratio is reported as a function of the average charged particle multiplicity at different center-of-mass energies.
Zubayer Ahammed - One of the best experts on this subject based on the ideXlab platform.
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jet associated Deuteron production in pp collisions at s 13 tev
Physics Letters B, 2021Co-Authors: Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Michelangelo Agnello, Zubayer Ahammed, N Agrawal, S Ahmad, Aglieri G Rinella, Sang Un AhnAbstract:Author(s): Acharya, S; Adamova, D; Adler, A; Adolfsson, J; Aglieri Rinella, G; Agnello, M; Agrawal, N; Ahammed, Z; Ahmad, S; Ahn, SU; Akbar, Z; Akindinov, A; Al-Turany, M; Albuquerque, DSD; Aleksandrov, D; Alessandro, B; Alfanda, HM; Alfaro Molina, R; Ali, B; Ali, Y; Alici, A; Alizadehvandchali, N; Alkin, A; Alme, J; Alt, T; Altenkamper, L; Altsybeev, I; Anaam, MN; Andrei, C; Andreou, D; Andronic, A; Angeletti, M; Anguelov, V; Anticic, T; Antinori, F; Antonioli, P; Apadula, N; Aphecetche, L; Appelshauser, H; Arcelli, S; Arnaldi, R; Arratia, M; Arsene, IC; Arslandok, M; Augustinus, A; Averbeck, R; Aziz, S; Azmi, MD; Badala, A; Baek, YW; Bai, X; Bailhache, R; Bala, R; Balbino, A; Baldisseri, A; Ball, M; Banerjee, D; Barbera, R; Barioglio, L; Barlou, M; Barnafoldi, GG; Barnby, LS; Barret, V; Bartels, C; Barth, K; Bartsch, E; Baruffaldi, F; Bastid, N; Basu, S; Batigne, G; Batyunya, B; Bauri, D; Bazo Alba, JL; Bearden, IG; Beattie, C; Belikov, I; Bell Hechavarria, ADC; Bellini, F; Bellwied, R; Belokurova, S; Belyaev, V; Bencedi, G; Beole, S; Bercuci, A; Berdnikov, Y | Abstract: Deuteron production in high-energy collisions is sensitive to the space–time evolution of the collision system, and is typically described by a coalescence mechanism. For the first time, we present results on jet-associated Deuteron production in pp collisions at s=13 TeV, providing an opportunity to test the established picture for Deuteron production in events with a hard scattering. Using a trigger particle with high transverse-momentum (pTg5 GeV/c) as a proxy for the presence of a jet at midrapidity, we observe a measurable population of Deuterons being produced around the jet proxy. The associated Deuteron yield measured in a narrow angular range around the trigger particle differs by 2.4–4.8 standard deviations from the uncorrelated background. The data are described by PYTHIA model calculations featuring baryon coalescence.
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Jet-associated Deuteron production in pp collisions at $\sqrt{s}=13$ TeV
2020Co-Authors: Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Gianluca Aglieri Rinella, Michelangelo Agnello, Zubayer Ahammed, Neelima Agrawal, Shakeel Ahmad, Sang Un AhnAbstract:Deuteron production in high-energy collisions is sensitive to the space-time evolution of the collision system, and is typically described by a coalescence mechanism. For the first time, we present results on jet-associated Deuteron production in \pp\ collisions at $\sqrt{s}=13$ TeV, providing an opportunity to test the established picture for Deuteron production in events with a hard scattering. Using a trigger particle with high transverse-momentum ($p_{\rm T}>5$ GeV/$c$) as a proxy for the presence of a jet at midrapidity, we observe a measurable population of Deuterons being produced around the jet proxy. The associated Deuteron yield measured in a narrow angular range around the trigger particle differs by 2.4-4.8 standard deviations from the uncorrelated background. The data are described by PYTHIA model calculations featuring baryon coalescence.
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anti Deuteron production in pp collisions at s 13tev
European Physical Journal C, 2020Co-Authors: Shreyasi Acharya, Dagmar Adamova, Alexander Adler, Jonatan Adolfsson, Michelangelo Agnello, Zubayer Ahammed, M M Aggarwal, N Agrawal, Aglieri G Rinella, S AhmadAbstract:The study of (anti-)Deuteron production in pp collisions has proven to be a powerful tool to investigate the formation mechanism of loosely bound states in high-energy hadronic collisions. In this paper the production of $\text {(anti-)Deuterons}$ is studied as a function of the charged particle multiplicity in inelastic pp collisions at $\sqrt{s}=13$ TeV using the ALICE experiment. Thanks to the large number of accumulated minimum bias events, it has been possible to measure (anti-)Deuteron production in pp collisions up to the same charged particle multiplicity (${\mathrm {d} N_{ch}/\mathrm {d} \eta } \sim 26$) as measured in p–Pb collisions at similar centre-of-mass energies. Within the uncertainties, the Deuteron yield in pp collisions resembles the one in p–Pb interactions, suggesting a common formation mechanism behind the production of light nuclei in hadronic interactions. In this context the measurements are compared with the expectations of coalescence and statistical hadronisation models (SHM).
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multiplicity dependence of anti Deuteron production in pp collisions at s 7 tev
Physics Letters B, 2019Co-Authors: Shreyasi Acharya, Dagmar Adamova, Jonatan Adolfsson, Michelangelo Agnello, M M Aggarwal, Gianluca Aglieri Rinella, Fernando Torales Acosta, Souvik Priyam Adhya, C Adler, Zubayer AhammedAbstract:In this letter, the production of Deuterons and anti-Deuterons in pp collisions at √s=7 TeV is studied as a function of the charged-particle multiplicity density at mid-rapidity with the ALICE detector at the LHC. Production yields are measured at mid-rapidity in five multiplicity classes and as a function of the Deuteron transverse momentum (pT). The measurements are discussed in the context of hadron-coalescence models. The coalescence parameter B2, extracted from the measured spectra of (anti-)Deuterons and primary (anti-)protons, exhibits no significant pT-dependence for pT < 3 GeV/c, in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the B2 parameter is found to decrease smoothly from low multiplicity pp Pb-Pb collisions, in qualitative agreement with more elaborate coalescence models. The measured mean transverse momentum of (anti-)Deuterons in pp is not reproduced by the Blast-Wave model calculations that simultaneously describe pion, kaon and proton spectra, in contrast to central Pb-Pb collisions. The ratio between the pT-integrated yield of Deuterons to protons, d/p, is found to increase with the charged-particle multiplicity, as observed in inelastic pp collisions at different centre-of-mass energies. The d/p ratios are reported in a wide range, from the lowest to the highest multiplicity values measured in pp collisions at the LHC.
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production of Deuterons tritons he 3 nuclei and their antinuclei in pp collisions at s 0 9 2 76 and 7 tev
Physical Review C, 2018Co-Authors: Shreyasi Acharya, Dagmar Adamova, Jonatan Adolfsson, Michelangelo Agnello, Zubayer Ahammed, J Adam, M M Aggarwal, Gianluca Aglieri Rinella, N Agrawal, S AhmadAbstract:Invariant differential yields of Deuterons and antiDeuterons in pp collisions at s = 0.9, 2.76 and 7 TeV and the yields of tritons, He3 nuclei, and their antinuclei at s = 7 TeV have been measured with the ALICE detector at the CERN Large Hadron Collider. The measurements cover a wide transverse momentum (pT) range in the rapidity interval |y|<0.5, extending both the energy and the pT reach of previous measurements up to 3 GeV/c for A=2 and 6 GeV/c for A=3. The coalescence parameters of (anti)Deuterons and He¯3 nuclei exhibit an increasing trend with pT and are found to be compatible with measurements in pA collisions at low pT and lower energies. The integrated yields decrease by a factor of about 1000 for each increase of the mass number with one (anti)nucleon. Furthermore, the Deuteron-to-proton ratio is reported as a function of the average charged particle multiplicity at different center-of-mass energies.
Jie Feng - One of the best experts on this subject based on the ideXlab platform.
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the curious case of high energy Deuterons in galactic cosmic rays
The Astrophysical Journal, 2017Co-Authors: Nicola Tomassetti, Jie FengAbstract:A new analysis of cosmic ray (CR) data collected by the SOKOL experiment in space found that the Deuteron-to-helium ratio at energies between 500 and 2000 GeV/nucleon takes the value d/He ~ 1.5. As we will show, this result cannot be explained by standard models of secondary CR production in the interstellar medium and points to the existence of a high-energy source of CR Deuterons. To account for the Deuteron excess in CRs, we argue that the only viable solution is hadronic interaction processes of accelerated particles inside old supernova remnants (SNRs). From this mechanism, however, the B/C ratio is also expected to increase at energies above ~50 of GeV/nucleon, in conflict with new precision data just released by the AMS-02 experiment. Hence, if this phenomenon is a real physical effect, hadronic production of CR Deuterons must occur in SNRs characterized by low metal abundance. In such a scenario, the sources accelerating C––O nuclei are not the same as those accelerating helium or protons, so that the connection between d/He ratio and B/C ratio is broken, and the latter cannot be used to place constraints on the production of light isotopes or antiparticles.
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the curious case of high energy Deuterons in galactic cosmic rays
arXiv: High Energy Astrophysical Phenomena, 2016Co-Authors: Nicola Tomassetti, Jie FengAbstract:A new analysis of cosmic ray (CR) data collected by the SOKOL experiment in space found that the Deuteron-to-helium ratio at energies between 500 and 2000 GeV/nucleon takes the value d/He ~ 1.5. As we will show, this result cannot be explained by standard models of secondary CR production in the interstellar medium and points to the existence of a high-energy source of CR Deuterons. To account for the Deuteron excess in CRs, we argue that the only viable solution is hadronic interaction processes of accelerated particles inside old supernova remnants (SNRs). From this mechanism, however, the B/C ratio is also expected to increase at energy above ~50 of GeV/nucleon, in conflict with new precision data just released by the AMS-02 experiment. Hence, if this phenomenon is a real physical effect, hadronic production of CR Deuterons must occur in SNRs characterized by low metal abundance. In such a scenario, the sources accelerating C-N-O nuclei are not the same as those accelerating helium or protons, so that the connection between d/He ratio and B/C ratio is broken, and the latter cannot be used to place constraints on the production of light isotopes or antiparticles.