Multiplicity dependence of (anti-)deuteron production in pp collisions at √s = 7 TeV
ALICE Collaboration. (2019). Multiplicity dependence of (anti-)deuteron production in pp collisions at √s = 7 TeV. Physics Letters B, 794, 50-63. https://doi.org/10.1016/j.physletb.2019.05.028
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Physics Letters BAuthors
Date
2019Copyright
© 2019 The Author(s).
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 chargedparticle 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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