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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/LM2023034" target="_blank" >LM2023034: Brookhavenská národní laboratoř – účast České republiky</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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

Název periodika

PHYSICAL REVIEW C

ISSN

2469-9985

e-ISSN

2469-9993

Svazek periodika

110

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

20

Strana od-do

—

Kód UT WoS článku

001355881200001

EID výsledku v databázi Scopus

2-s2.0-85200669758