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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BG - Nuclear, atomic and molecular physics, accelerators

OECD FORD branch

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Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

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

Publication year

2016

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

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Volume of the periodical

93

Issue of the periodical within the volume

9

Country of publishing house

US - UNITED STATES

Number of pages

15

Pages from-to

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UT code for WoS article

000376641000004

EID of the result in the Scopus database

2-s2.0-84969794971