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

Abstract

The production of J/$\psi$ 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 ${\mathcal{L}}_{\mathrm{int}}$ = 19.4 $\pm$ 0.4 nb${}^{-1}$ and ${\mathcal{L}}_{\mathrm{int}}$ = 32.2 $\pm$ 0.5 nb${}^{-1}$ at $\sqrt{s}$ = 5.02 and 13 TeV, respectively. The fraction of non-prompt J/$\psi$ mesons, i.e. those originating from the decay of beauty hadrons, is measured down to a transverse momentum $p_{\mathrm{T}}$ = 2 GeV/$c$ (1 GeV/$c$) at $\sqrt{s}$ = 5.02 TeV (13 TeV). The $p_{\mathrm{T}}$ and rapidity ($y$) differential cross sections, as well as the corresponding values integrated over $p_{\mathrm{T}}$ and $y$, are carried out separately for prompt and non-prompt J/$\psi$ mesons. The results are compared with measurements from other experiments and theoretical calculations based on quantum chromodynamics (QCD). The shapes of the $p_{\mathrm{T}}$ 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 ${\sigma }_{\mathrm{b}\overline{\mathrm{b}}}=541\pm 45(stat.)\pm 69(syst.{)}_{-12}^{+10}(extr.)\mu \mathrm{b}$ and ${\sigma }_{\mathrm{b}\overline{\mathrm{b}}}=218\pm 37(stat.)\pm 31(syst.{)}_{-9.1}^{+8.2}(extr.)\mu \mathrm{b}$ 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.

31 pages, 6 captioned figures, 2 tables, authors from page 25, published version, figures at http://alice-publications.web.cern.ch/node/7315

References in corpus (12)

• PYTHIA 6.4 Physics and Manual
• Heavy quarkonium: progress, puzzles, and opportunities
• Implications of CTEQ global analysis for collider observables
• The Color Glass Condensate
• QCD corrections to J/psi and Upsilon production at hadron colliders
• Polarization for Prompt J/psi, psi(2s) production at the Tevatron and LHC
• Upsilon production at the Tevatron and the LHC
• Quarkonium Production in an Improved Color Evaporation Model
• Quarkonium production in the LHC era: a polarized perspective
• Next-to-leading-order tests of nonrelativistic-QCD factorization with $J/\psi$ yield and polarization
• An experimental review of open heavy flavor and quarkonium production at RHIC
• J/psi production with NRQCD: HERA, Tevatron, RHIC and LHC

Cited by in corpus (11)

• The ALICE experiment: a journey through QCD
• Properties of the QCD Matter: A Review of Selected Results from the ALICE Experiment
• Study of flavor dependence of the baryon-to-meson ratio in proton-proton collisions at $\sqrt{s}=13$ TeV
• Bottom energy loss and non-prompt $J/\psi$ production in relativistic heavy ion collisions
• Measurement of the production cross-section of $J/\psi$ and $\psi (2$S$)$ mesons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Measurement of electrons from beauty-hadron decays in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• A machine learning-based study of open-charm hadrons in proton-proton collisions at the Large Hadron Collider
• Inclusive, prompt and non-prompt $\mathrm{J}/\psi$ identification in proton-proton collisions at the Large Hadron Collider using machine learning
• Measurement of inclusive J/$\psi$ pair production cross section in pp collisions at $\sqrt{s}=13$ TeV
• Machine learning driven identification of heavy flavor decay leptons in proton-proton collisions at the Large Hadron Collider
• Topological production of charmonia with event-shape engineering in $pp$ collisions at $\sqrt{s}=13$ TeV using PYTHIA8