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



Acharya, S, Acosta, FT, Adamova, D, Adhya, SP, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, G Aglieri, Agnello, M, Ahammed, Z
et al (show 1004 more authors) (2019) Multiplicity dependence of (anti-)deuteron production in pp collisions at root s=7 TeV. PHYSICS LETTERS B, 794. pp. 50-63. ISSN 0370-2693, 1873-2445

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Abstract

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 (p<inf>T</inf>). The measurements are discussed in the context of hadron–coalescence models. The coalescence parameter B<inf>2</inf>, extracted from the measured spectra of (anti-)deuterons and primary (anti-)protons, exhibits no significant p<inf>T</inf>-dependence for p<inf>T</inf><3 GeV/c, in agreement with the expectations of a simple coalescence picture. At fixed transverse momentum per nucleon, the B<inf>2</inf> 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<inf>T</inf>-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.

Item Type: Article
Uncontrolled Keywords: 5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 5110 Synchrotrons and Accelerators, 51 Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 15 Aug 2019 08:36
Last Modified: 14 Jun 2025 08:33
DOI: 10.1016/j.physletb.2019.05.028
Open Access URL: http://doi.org/10.1016/j.physletb.2019.05.028
Related Websites:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3051798