Searching for gluon saturation effects in the momentum transfer dependence of coherent charmonium electroproduction off nuclei

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F25%3A00386075" target="_blank" >RIV/68407700:21340/25:00386075 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1103/hmd1-64yj" target="_blank" >https://doi.org/10.1103/hmd1-64yj</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/hmd1-64yj" target="_blank" >10.1103/hmd1-64yj</a>

Result language

angličtina

Original language name

Searching for gluon saturation effects in the momentum transfer dependence of coherent charmonium electroproduction off nuclei

Original language description

We study for the first time the transverse momentum transfer distributions dσ/dt in coherent production of charmonia in nuclear ultraperipheral and electron-ion collisions within the QCD color dipole approach based on a rigorous Green function formalism. This allows us to treat properly the color transparency effects, as well as the higher and leading-twist shadowing corrections associated with the |Q Q> and |Q QnG> Fock components of the photon. While the multigluon photon fluctuations represent the dominant source of nuclear shadowing at kinematic regions related to the recent LHC and its future upgrade to LHeC, the upcoming electron-ion collider at RHIC will additionally require the proper incorporation of reduced quark shadowing. The latter effect leads to a significant decrease in the differential cross sections dσ/dt compared to standard calculations based on the eikonal form for the dipole-nucleus amplitude. The leading-twist shadowing corrections, corresponding to a nonlinear QCD evolution of a partial dipole-nucleus amplitude, reduce substantially charmonium t-distributions in the LHeC energy range. We predict a nonmonotonic energy dependence of dσ/dt suggesting so possible gluon saturation effects with increased onset at larger t-values. In addition to shadowing corrections, we study how the color transparency effects affect the shape of t-dependent nuclear modification factor.

Czech name

—

Czech description

—

Type

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

CEP classification

—

OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/EF20_079%2F0017983" target="_blank" >EF20_079/0017983: Mobility CTU MSCA-IF-IV-v-79</a><br>

Continuities

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

Publication year

2025

Confidentiality

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

Name of the periodical

PHYSICAL REVIEW D

ISSN

2470-0010

e-ISSN

2470-0029

Volume of the periodical

112

Issue of the periodical within the volume

9

Country of publishing house

US - UNITED STATES

Number of pages

15

Pages from-to

1-15

UT code for WoS article

001612347700004

EID of the result in the Scopus database

2-s2.0-105026412815