Photoproduction of low-$p_{\rm T}$ J/$\psi$ from peripheral to central Pb$-$Pb collisions at 5.02 TeV - INSPIRE

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Photoproduction of low- $p_{\rm T}$ J/ $\psi$ from peripheral to central Pb $-$ Pb collisions at 5.02 TeV

ALICE

Collaboration

Apr 22, 2022

14 pages

Published in:

Phys.Lett.B 846 (2023) 137467

Published: Sep 17, 2023

e-Print:

2204.10684 [nucl-ex]

DOI:

10.1016/j.physletb.2022.137467 (publication)

Report number:

CERN-EP-2022-071

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (arXiv)

An excess of J/

\psi

yield at very low transverse momentum (

p_{\rm T} < 0.3

GeV/

c

), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb

-

Pb collisions at a center-of-mass energy per nucleon pair of

\sqrt{s_{\rm NN}} = 5.02

TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity (

2.5<y<4

). The nuclear modification factor at very low

p_{\rm T}

and the coherent photoproduction cross section are measured as a function of centrality down to the 10% most central collisions. These results extend the previous study at

\sqrt{s_{\rm NN}} = 2.76

TeV, confirming the clear excess over hadronic production in the

p_{\rm T}

range 0

-

0.3 GeV/

c

and the centrality range 70

-

90%, and establishing an excess with a significance greater than 5

\sigma

also in the 50

-

70% and 30

-

50% centrality ranges. The results are compared with earlier measurements at

\sqrt{s_{\rm NN}} = 2.76

TeV and with different theoretical predictions aiming at describing how coherent photoproduction occurs in hadronic interactions with nuclear overlap.

Note:

22 pages, 4 captioned figures, 3 tables, authors from page 17, published version, figures at http://alice-publications.web.cern.ch/node/7890

J/psi(3100): photoproduction
transverse momentum: low
heavy ion: scattering
dimuon: decay
experimental results
5020 GeV-cms/nucleon

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Figures(4)

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