Prompt and non-prompt J/ψ production cross sections at midrapidity in proton-proton collisions at s $$ \sqrt{\mathrm{s}} $$ = 5.02 and 13 TeV
Journal of High Energy Physics(2022)
摘要
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.
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关键词
Hadron-Hadron Scattering
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