Prompt and non-prompt $J/\psi $ and $\psi (2\mathrm {S})$ suppression at high transverse momentum in $5.02~\mathrm {TeV}$ Pb+Pb collisions with the ATLAS experiment - INSPIRE

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Prompt and non-prompt $J/\psi$ and $\psi (2\mathrm {S})$ suppression at high transverse momentum in $5.02~\mathrm {TeV}$ Pb+Pb collisions with the ATLAS experiment

ATLAS

Collaboration

May 10, 2018

39 pages

Published in:

Eur.Phys.J.C 78 (2018) 9, 762

Published: Sep 21, 2018

e-Print:

1805.04077 [nucl-ex]

DOI:

10.1140/epjc/s10052-018-6219-9

Report number:

CERN-EP-2018-049

Experiments:

CERN-LHC-ATLAS

View in:

reference search148 citations

Citations per year

Abstract: (Springer)

A measurement of

J/\psi

and

\psi (2\mathrm {S})

production is presented. It is based on a data sample from Pb+Pb collisions at

\sqrt{s_{\mathrm {NN}}} = 5.02~\mathrm {TeV}

and pp collisions at

\sqrt{s} = 5.02~\mathrm {TeV}

recorded by the ATLAS detector at the LHC in 2015, corresponding to an integrated luminosity of

0.42~\mathrm {nb}^{-1}

and

25~\mathrm {pb}^{-1}

in Pb+Pb and pp, respectively. The measurements of per-event yields, nuclear modification factors, and non-prompt fractions are performed in the dimuon decay channel for

9< p_{T}^{\mu \mu } < 40

GeV in dimuon transverse momentum, and

-2< y_{\mu \mu } < 2

in rapidity. Strong suppression is found in Pb+Pb collisions for both prompt and non-prompt

J/\psi

, increasing with event centrality. The suppression of prompt

\psi (2\mathrm {S})

is observed to be stronger than that of

J/\psi

, while the suppression of non-prompt

\psi (2\mathrm {S})

is equal to that of the non-prompt

J/\psi

within uncertainties, consistent with the expectation that both arise from b-quarks propagating through the medium. Despite prompt and non-prompt

J/\psi

arising from different mechanisms, the dependence of their nuclear modification factors on centrality is found to be quite similar.

Note:

39 pages in total, author list starting page 23, 9 figures, 3 tables, submitted to EPJC. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2016-07

dimuon: transverse momentum
transverse momentum: high
dimuon: decay
p p: scattering
charmonium: suppression
heavy ion: scattering
charmonium: direct production
quantum chromodynamics: matter
CERN LHC Coll
charmonium: regeneration

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