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Title: Prompt and non-prompt J/ψ production cross sections at midrapidity in proton-proton collisions at $$ \sqrt{\mathrm{s}} $$ = 5.02 and 13 TeV

Journal Article · · Journal of High Energy Physics (Online)
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The production of J/ψ is measured at midrapidity (|y| < 0.9) in proton-proton collisions at \( \sqrt{s} \) = 5.02 and 13 TeV, through the dielectron decay channel, using the ALICE detector at the Large Hadron Collider. The data sets used for the analyses correspond to integrated luminosities of \( \mathcal{L} \)int = 19.4 ± 0.4 nb-1 and \( \mathcal{L} \)int = 32.2 ± 0.5 nb-1 at \( \sqrt{s} \) = 5.02 and 13 TeV, respectively. The fraction of non-prompt J/ψ mesons, i.e. those originating from the decay of beauty hadrons, is measured down to a transverse momentum pT = 2 GeV/c (1 GeV/c) at \( \sqrt{s} \) = 5.02 TeV (13 TeV). The pT and rapidity (y) differential cross sections, as well as the corresponding values integrated over pT and y, are carried out separately for prompt and non-prompt J/ψ mesons. The results are compared with measurements from other experiments and theoretical calculations based on quantum chromodynamics (QCD). The shapes of the pT and y distributions of beauty quarks predicted by state-of-the-art perturbative QCD models are used to extrapolate an estimate of the \( \mathrm{b}\overline{\mathrm{b}} \) pair cross section at midrapidity and in the total phase space. The total \( \mathrm{b}\overline{\mathrm{b}} \) cross sections are found to be \( {\sigma}_{\mathrm{b}\overline{\mathrm{b}}} \) = 541 ± 45 (stat.) ± 69 \( {\left(\mathrm{syst}.\right)}_{-12}^{+10} \) (extr.) μb and \( {\sigma}_{\mathrm{b}\overline{\mathrm{b}}} \) = 218±37 (stat.)±31 \( {\left(\mathrm{syst}.\right)}_{-9.1}^{+8.2} \) (extr.) μb at \( \sqrt{s} \) = 13 and 5.02 TeV, respectively. The value obtained from the combination of ALICE and LHCb measurements in pp collisions at \( \sqrt{s} \) = 13 TeV is also provided.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP)
Contributing Organization:
ALICE Collaboration
Grant/Contract Number:
AC02-05CH11231; AC05-00OR22725; FG02-96ER40982
OSTI ID:
1869664
Alternate ID(s):
OSTI ID: 1890298; OSTI ID: 2007914
Journal Information:
Journal of High Energy Physics (Online), Vol. 2022, Issue 3; ISSN 1029-8479
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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