Prompt and non-prompt J$/\psi$ production at midrapidity in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

Abstract

The transverse momentum ($p_{\mathrm{T}}$) and centrality dependence of the nuclear modification factor $R_{\mathrm{AA}}$ of prompt and non-prompt J$/\psi$, the latter originating from the weak decays of beauty hadrons, have been measured by the ALICE collaboration in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV. The measurements are carried out through the ${\mathrm{e}}^{+}{\mathrm{e}}^{-}$ decay channel at midrapidity ($|y|<0.9$) in the transverse momentum region $1.5<p_{\mathrm{T}}<10$ GeV/$c$. Both prompt and non-prompt J$/\psi$ measurements indicate a significant suppression for $p_{\mathrm{T}}>$ 5 GeV/$c$, which becomes stronger with increasing collision centrality. The results are consistent with similar LHC measurements in the overlapping $p_{\mathrm{T}}$ intervals, and cover the kinematic region down to $p_{\mathrm{T}}$ = 1.5 GeV/$c$ at midrapidity, not accessible by other LHC experiments. The suppression of prompt J$/\psi$ in central and semicentral collisions exhibits a decreasing trend towards lower transverse momentum, described within uncertainties by models implementing J$/\psi$ production from recombination of c and $\overline{\mathrm{c}}$ quarks produced independently in different partonic scatterings. At high transverse momentum, transport models including quarkonium dissociation are able to describe the suppression for prompt J$/\psi$. For non-prompt J$/\psi$, the suppression predicted by models including both collisional and radiative processes for the computation of the beauty-quark energy loss inside the quark$-$gluon plasma is consistent with measurements within uncertainties.

36 pages, 12 captioned figures, 3 tables, authors from page 30, published version, figures at http://alice-publications.web.cern.ch/node/9601

References in corpus (10)

• PYTHIA 6.4 Physics and Manual
• Glauber Modeling in High Energy Nuclear Collisions
• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• Towards an understanding of the RHIC single electron data
• A light-cone wavefunction approach to open heavy flavor dynamics in QCD matter
• Quark Coalescence based on a Transport Equation
• Heavy flavours in heavy-ion collisions: quenching, flow and correlations
• Lattice Simulations of the Thermodynamics of Strongly Interacting Elementary Particles and the Exploration of New Phases of Matter in Relativistic Heavy Ion Collisions
• Heavy quark jet quenching with collisional plus radiative energy loss and path length fluctuations
• Bottom energy loss and non-prompt $J/\psi$ production in relativistic heavy ion collisions

Cited by in corpus (1)

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