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

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

ALICE

Collaboration

Aug 30, 2023

36 pages

Published in:

JHEP 02 (2024) 066

Published: Feb 9, 2024

e-Print:

2308.16125 [nucl-ex]

DOI:

10.1007/JHEP02(2024)066

Report number:

CERN-EP-2023-190

Experiments:

CERN-LHC-ALICE,
CERN-LHC-ALICE

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Abstract: (Springer)

The transverse momentum (p

_{T}

) and centrality dependence of the nuclear modification factor R

_{AA}

of prompt and non-prompt J/ψ, the latter originating from the weak decays of beauty hadrons, have been measured by the ALICE collaboration in Pb–Pb collisions at

\sqrt{s_{\textrm{NN}}}

= 5.02 TeV. The measurements are carried out through the e

^{+}

e

^{−}

decay channel at midrapidity (|y| < 0.9) in the transverse momentum region 1.5 < p

_{T}

< 10 GeV/c. Both prompt and non-prompt J/ψ measurements indicate a significant suppression for p

_{T}

> 5 GeV/c, which becomes stronger with increasing collision centrality. The results are consistent with similar LHC measurements in the overlapping p

_{T}

intervals, and cover the kinematic region down to p

_{T}

= 1.5 GeV/c at midrapidity, not accessible by other LHC experiments. The suppression of prompt J/ψ in central and semicentral collisions exhibits a decreasing trend towards lower transverse momentum, described within uncertainties by models implementing J/ψ production from recombination of c and

\overline{\textrm{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/ψ. For non-prompt J/ψ, 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.[graphic not available: see fulltext]

Note:

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

Heavy Ion Experiments
Heavy Quark Production
Quarkonium
gluon: plasma
transverse momentum: high
quarkonium: dissociation
decay: weak interaction
suppression
GeV
TeV

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