Nuclear effects in Drell-Yan pair production in high-energy pA collisions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F16%3A00302649" target="_blank" >RIV/68407700:21340/16:00302649 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1103/PhysRevD.93.094027" target="_blank" >http://dx.doi.org/10.1103/PhysRevD.93.094027</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevD.93.094027" target="_blank" >10.1103/PhysRevD.93.094027</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Nuclear effects in Drell-Yan pair production in high-energy pA collisions

Popis výsledku v původním jazyce

The Drell-Yan (DY) process of dilepton pair production off nuclei is not affected by final state interactions, energy loss, or absorption. A detailed phenomenological study of this process is thus convenient for investigation of the onset of initial-state effects in proton-nucleus (pA) collisions. In this paper, we present a comprehensive analysis of the DY process in pA interactions at RHIC and LHC energies in the color dipole framework. We analyze several effects affecting the nuclear suppression, R-pA < 1, of dilepton pairs, such as the saturation effects, restrictions imposed by energy conservation (the initial-state effective energy loss), and the gluon shadowing, as a function of the rapidity, the invariant mass of the dileptons, and their transverse momenta p(T). In this analysis, we take into account not only the gamma* but also the Z(0) contribution to the production cross section, thus extending the predictions to large dilepton invariant masses. Besides the nuclear attenuation of produced dileptons at large energies and forward rapidities emerging due to the onset of shadowing effects, we predict a strong suppression at large p(T), dilepton invariant masses, and Feynman variable x(F) caused by the initial-state interaction effects in kinematic regions where no shadowing is expected. The manifestations of nuclear effects are also investigated in terms of the correlation function in the azimuthal angle between the dilepton pair and a forward pion Delta phi for different energies, dilepton rapidities, and invariant dilepton masses. We predict that the characteristic double-peak structure of the correlation function around Delta phi similar or equal to pi arises for very forward pions and large-mass dilepton pairs.

Název v anglickém jazyce

Nuclear effects in Drell-Yan pair production in high-energy pA collisions

Popis výsledku anglicky

The Drell-Yan (DY) process of dilepton pair production off nuclei is not affected by final state interactions, energy loss, or absorption. A detailed phenomenological study of this process is thus convenient for investigation of the onset of initial-state effects in proton-nucleus (pA) collisions. In this paper, we present a comprehensive analysis of the DY process in pA interactions at RHIC and LHC energies in the color dipole framework. We analyze several effects affecting the nuclear suppression, R-pA < 1, of dilepton pairs, such as the saturation effects, restrictions imposed by energy conservation (the initial-state effective energy loss), and the gluon shadowing, as a function of the rapidity, the invariant mass of the dileptons, and their transverse momenta p(T). In this analysis, we take into account not only the gamma* but also the Z(0) contribution to the production cross section, thus extending the predictions to large dilepton invariant masses. Besides the nuclear attenuation of produced dileptons at large energies and forward rapidities emerging due to the onset of shadowing effects, we predict a strong suppression at large p(T), dilepton invariant masses, and Feynman variable x(F) caused by the initial-state interaction effects in kinematic regions where no shadowing is expected. The manifestations of nuclear effects are also investigated in terms of the correlation function in the azimuthal angle between the dilepton pair and a forward pion Delta phi for different energies, dilepton rapidities, and invariant dilepton masses. We predict that the characteristic double-peak structure of the correlation function around Delta phi similar or equal to pi arises for very forward pions and large-mass dilepton pairs.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BG - Jaderná, atomová a molekulová fyzika, urychlovače

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2016

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

—

Svazek periodika

93

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

15

Strana od-do

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Kód UT WoS článku

000376641000004

EID výsledku v databázi Scopus

2-s2.0-84969794971