Exclusive J/ψ, ψ(2s), and e+e- pair production in Au plus Au ultraperipheral collisions at the BNL Relativistic Heavy Ion Collider

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F24%3A00379772" target="_blank" >RIV/68407700:21340/24:00379772 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1103/PhysRevC.110.014911" target="_blank" >https://doi.org/10.1103/PhysRevC.110.014911</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevC.110.014911" target="_blank" >10.1103/PhysRevC.110.014911</a>

Result language

angličtina

Original language name

Exclusive J/ψ, ψ(2s), and e+e- pair production in Au plus Au ultraperipheral collisions at the BNL Relativistic Heavy Ion Collider

Original language description

Measurements of exclusive J/psi, psi(2s), and electron-positron (e(+) e(-)) pair photoproduction in Au + Au ultraperipheral collisions are reported by the STAR experiment at root s(NN) = 200 GeV. We report several first measurements at the BNL Relativistic Heavy Ion Collider, which are (i) J/psi photoproduction with large momentum transfer up to 2.2 (GeV/c)(2), (ii) coherent J/psi photoproduction associated with neutron emissions from nuclear breakup, (iii) the rapidity dependence of incoherent J/psi photoproduction, (iv) the psi(2s) photoproduction cross section at midrapidity, and (v) e(+) e(-) pair photoproduction up to high invariant mass of 6 GeV/c(2). For measurement (ii), the coherent J/psi total cross section of gamma + Au -> J/psi + Au as a function of the center-of-mass energy W-gamma N has been obtained without photon energy ambiguities. The data are quantitatively compared with the Monte Carlo models STARlight, Sartre, BeAGLE, and theoretical calculations of gluon saturation with color glass condensate, nuclear shadowing with leading twist approximation, quantum electrodynamics, and the next-to-leading-order perturbative QCD. At the photon-nucleon center-of-mass energy of 25.0 GeV, the coherent and incoherent J/psi cross sections of Au nuclei are found to be 71% +/- 10% and 36% +/- 7%, respectively, of that of free protons. These data provide an important experimental constraint for nuclear parton distribution functions and a unique opportunity to advance the understanding of the nuclear modification effect at the top RHIC energy.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/LM2023034" target="_blank" >LM2023034: Brookhaven National Laboratory - Participation of the Czech Republic</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

PHYSICAL REVIEW C

ISSN

2469-9985

e-ISSN

2469-9993

Volume of the periodical

110

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

20

Pages from-to

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UT code for WoS article

001355881200001

EID of the result in the Scopus database

2-s2.0-85200669758