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@ARTICLE{Acharya:245792,
author = {Acharya, Shreyasi and others},
title = {{C}oherent ${J}/ \psi$ and $\phi$' photoproduction at
midrapidity in ultra-peripheral {P}b–{P}b collisions
at $\sqrt {s_{{NN}}}$ = 5.02 {T}e{V}},
journal = {The European physical journal / C},
volume = {81},
number = {8},
issn = {1434-6052},
address = {Heidelberg},
publisher = {Springer},
reportid = {GSI-2022-00112, arXiv:2101.04577. CERN-EP-2021-002},
pages = {712},
year = {2021},
note = {29 pages, 6 captioned figures, 4 tables, authors from page
23, published version, figures at
http://alice-publications.web.cern.ch/node/6778 "This
article is licensed under a Creative Commons Attribution 4.0
International License, which permits use, sharing,
adaptation, distribution and reproduction in any medium or
format, as long as you give appropriate credit to the
original author(s) and the source, provide a link to the
Creative Commons licence, and indicate if changes were made.
The images or other third party material in this article are
included in the article’s Creative Commons licence, unless
indicated otherwise in a credit line to the material. If
material is not included in the article’s Creative Commons
licence and your intended use is not permitted by statutory
regulation or exceeds the permitted use, you will need to
obtain permission directly from the copyright holder. To
view a copy of this licence, visit
http://creativecommons.org/licenses/by/4.0/. Funded by
SCOAP3"},
abstract = {The coherent photoproduction of $\rm{J/\psi}$ and
$\rm{\psi'}$ mesons was measured in ultra-peripheral Pb-Pb
collisions at a center-of-mass energy
$\sqrt{s_{\mathrm{NN}}}~=~5.02$ TeV with the ALICE detector.
Charmonia are detected in the central rapidity region for
events where the hadronic interactions are strongly
suppressed. The $\rm{J/\psi}$ is reconstructed using the
dilepton ($l^{+} l^{-}$) and proton-antiproton decay
channels, while for the $\rm{\psi'}$, the dilepton and the
$l^{+} l^{-} \pi^{+} \pi^{-}$ decay channels are studied.
The analysis is based on an event sample corresponding to an
integrated luminosity of about 233 ${\mu b}^{-1}$. The
results are compared with theoretical models for coherent
$\rm{J/\psi}$ and $\rm{\psi'}$ photoproduction. The coherent
cross section is found to be in a good agreement with models
incorporating moderate nuclear gluon shadowing of about 0.65
at a Bjorken-$x$ of around $6\times 10^{-4}$, such as the
EPS09 parametrization, however none of the models is able to
fully describe the rapidity dependence of the coherent
$\rm{J/\psi}$ cross section including ALICE measurements at
forward rapidity. The ratio of $\rm{\psi'}$ to $\rm{J/\psi}$
coherent photoproduction cross sections was also measured
and found to be consistent with the one for photoproduction
off protons.},
keywords = {J/psi(3100): photoproduction (INSPIRE) / psi(3685):
photoproduction (INSPIRE) / heavy ion: scattering (INSPIRE)
/ gluon: shadowing (INSPIRE) / coherence (INSPIRE) /
dilepton (INSPIRE) / rapidity (INSPIRE) / ALICE (INSPIRE) /
rapidity dependence (INSPIRE) / parametrization (INSPIRE) /
charmonium (INSPIRE) / experimental results (INSPIRE) / 5020
GeV-cms/nucleon (INSPIRE) / psi(3836): photoproduction
(INSPIRE) / suppression (INSPIRE) / anti-p p (INSPIRE) /
5020 GeV-cms/nucleon (INSPIRE)},
cin = {ALI / DTL / CIT / EXM / ALICE@CERN},
ddc = {530},
cid = {I:(DE-Ds200)ALI-20080822OR105 /
I:(DE-Ds200)DTL-20051214OR031 /
I:(DE-Ds200)CIT-20110310OR121 /
I:(DE-Ds200)EXM-20080818OR100 / I:(DE-Ds200)Coll-CERN-ALICE},
pnm = {612 - Cosmic Matter in the Laboratory (POF4-612) / HGS-HIRe
- HGS-HIRe for FAIR (HGS-HIRe) / SUC-GSI-Heidelberg -
Strategic university cooperation GSI-U Heidelberg
(SUC-GSI-HE) / SUC-GSI-Frankfurt - Strategic university
cooperation GSI-U Frankfurt/M (SUC-GSI-FR) /
SUC-GSI-Darmstadt - Strategic university cooperation GSI-TU
Darmstadt (SUC-GSI-DA)},
pid = {G:(DE-HGF)POF4-612 / G:(DE-Ds200)HGS-HIRe /
G:(DE-Ds200)SUC-GSI-HE / G:(DE-Ds200)SUC-GSI-FR /
G:(DE-Ds200)SUC-GSI-DA},
experiment = {EXP:(DE-H253)LHC-Exp-ALICE-20150101},
typ = {PUB:(DE-HGF)16},
eprint = {2101.04577},
howpublished = {arXiv:2101.04577},
archivePrefix = {arXiv},
SLACcitation = {$\%\%CITATION$ = $arXiv:2101.04577;\%\%$},
UT = {WOS:000692157200001},
doi = {10.1140/epjc/s10052-021-09437-6},
url = {https://repository.gsi.de/record/245792},
}
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