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

被引：14

作者：

Basso, Eduardo ^{[1
]}

Goncalves, Victor P. ^{[2
,3
]}

Krelina, Michal ^{[4
]}

Nemchik, Jan ^{[4
,5
]}

Pasechnik, Roman ^{[2
]}

机构：

[1] Univ Fed Rio de Janeiro, Inst Fis, Caixa Postal 68528, BR-21941972 Rio De Janeiro, RJ, Brazil

[2] Lund Univ, Dept Astron & Theoret Phys, SE-22362 Lund, Sweden

[3] Univ Fed Pelotas, Inst Fis & Matemat, High & Medium Energy Grp, BR-96010900 Pelotas, RS, Brazil

[4] Czech Tech Univ, FNSPE, Brehova 7, Prague 11519, Czech Republic

[5] Inst Expt Phys SAS, Watsonova 47, Kosice 04001, Slovakia

来源：

PHYSICAL REVIEW D | 2016年 / 93卷 / 09期

基金：

瑞典研究理事会;

关键词：

COLOR GLASS CONDENSATE; NONLINEAR GLUON EVOLUTION; INELASTIC EP SCATTERING; PARTON DISTRIBUTIONS; D+AU COLLISIONS; SMALL-X; SATURATION PHYSICS; HIGH-DENSITY; ART; UNITARIZATION;

D O I：

10.1103/PhysRevD.93.094027

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：15

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