Multiplicity dependence of (anti-)deuteron production in pp collisions at root s=7 TeV

Acharya, S.; Acosta, F. T.; Adamová, Dagmar; Bielčík, J.; Bielčíková, Jana; Broz, M.; Contreras, J. G.; Křížková Gajdošová, K.; Horák, D.; Křížek, Filip; Kučera, Vít; Kushpil, Svetlana; Lavička, R.; Mareš, Jiří A.; Petráček, V.; Šafařík, K.; Šumbera, Michal; Závada, Petr

doi:https://dx.doi.org/10.1016/j.physletb.2019.05.028

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Multiplicity dependence of (anti-)deuteron production in pp collisions at root s=7 TeV

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SYSNO ASEP	0505697
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Multiplicity dependence of (anti-)deuteron production in pp collisions at root s=7 TeV
Author(s)	Acharya, S. (IN) Acosta, F. T. (US) Adamová, Dagmar (UJF-V)_{RID, ORCID, SAI} Bielčík, J. (CZ) Bielčíková, Jana (UJF-V)_{RID, ORCID, SAI} Broz, M. (CZ) Contreras, J. G. (CZ) Křížková Gajdošová, K. (CZ) Horák, D. (CZ) Křížek, Filip (UJF-V)_{RID, ORCID, SAI} Kučera, Vít (UJF-V)_RID Kushpil, Svetlana (UJF-V)_{RID, ORCID, SAI} Lavička, R. (CZ) Mareš, Jiří A. (FZU-D)_{RID, ORCID} Petráček, V. (CZ) Šafařík, K. (CZ) Šumbera, Michal (UJF-V)_{RID, ORCID, SAI} Závada, Petr (FZU-D)_{RID, ORCID}
Number of authors	1013
Source Title	Physics Letters. B. - : Elsevier - ISSN 0370-2693 Roč. 794, č. 7 (2019), s. 50-63
Number of pages	14 s.
Publication form	Print - P
Language	eng - English
Country	NL - Netherlands
Keywords	ALICE collaboration ; heavy ion collisions
Subject RIV	BG - Nuclear, Atomic and Molecular Physics, Colliders
OECD category	Nuclear physics
Subject RIV - cooperation	Institute of Physics - Elementary Particles and High Energy Physics
R&D Projects	LTT17018 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
Research Infrastructure	CERN-CZ - 90058 - Fyzikální ústav AV ČR, v. v. i.
Method of publishing	Open access
Institutional support	FZU-D - RVO:68378271 ; UJF-V - RVO:61389005
UT WOS	000470065300009
EID SCOPUS	85066266065
DOI	10.1016/j.physletb.2019.05.028
Annotation	In this letter, the production of deuterons and anti-deuterons in pp collisions at root 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 (p(T)). The measurements are discussed in the context of hadron-coalescence models. The coalescence parameter B-2, extracted from the measured spectra of (anti-)deuteronsand primary (anti-)protons, exhibits no significant p(T)-dependence for p(T) < 3 GeV/c, in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the B-2 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 p(T)-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.
Workplace	Nuclear Physics Institute
Contact	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Year of Publishing	2020
Electronic address	https://doi.org/10.1016/j.physletb.2019.05.028

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