Multiplicity dependence of (anti-)deuteron production in pp collisions at √s=7 TeV
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 fu...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
22 May 2019
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| In: |
Physics letters
Year: 2019, Volume: 794, Pages: 50-63 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2019.05.028 |
| Online Access: | Verlag, Volltext: https://doi.org/10.1016/j.physletb.2019.05.028 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269319303387 
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| Author Notes: | ALICE Collaboration |
MARC
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| 245 | 1 | 0 | |a Multiplicity dependence of (anti-)deuteron production in pp collisions at √s=7 TeV |c ALICE Collaboration |
| 246 | 3 | 0 | |a sqrt |
| 246 | 3 | 3 | |a Multiplicity dependence of anti-deuteron production in pp collisions at square root s = 7TeV |
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| 500 | |a ALICE Collaboration: S. Acharya, V. Anguelov, M. Arslandok, M.C. Danisch, V.J.G. Feuillard, P. Glässel, J. Kim, M. Kim, S. Klewin, M.K. Köhler, L. Leardini, N.A. Martin, A. Ohlson, Y. Pachmayer, K. Reygers, R. Schicker, A. Schmah, M.O. Schmidt, J. Stachel, D.F. Weiser, B. Windelband [und weitere] | ||
| 500 | |a Gesehen am 11.07.2019 | ||
| 520 | |a 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 to 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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