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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

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

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

PHYSICAL REVIEW D

ISSN

2470-0010

e-ISSN

2470-0029

Svazek periodika

112

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

1-15

Kód UT WoS článku

001612347700004

EID výsledku v databázi Scopus

2-s2.0-105026412815