The small-x gluon distribution in centrality biased pA and pp collisions

Dumitru, Adrian; Kapilevich, Gary; Skokov, Vladimir

doi:10.1016/j.nuclphysa.2018.03.012

The small-x gluon distribution in centrality biased pA and pp collisions

Journal Article · Wed Apr 04 00:00:00 EDT 2018 · Nuclear Physics. A

DOI:https://doi.org/10.1016/j.nuclphysa.2018.03.012· OSTI ID:1434787

Dumitru, Adrian ^[1]; Kapilevich, Gary ^[2]; Skokov, Vladimir ^[3]

Baruch College, New York, NY (United States); The City Univ. of New York, New York, NY (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
The City Univ. of New York, New York, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)

Here, the nuclear modification factor R_pA(p_T) provides information on the small- x gluon distribution of a nucleus at hadron colliders. Several experiments have recently measured the nuclear modification factor not only in minimum bias but also for central pA collisions. In this paper we analyze the bias on the configurations of soft gluon fields introduced by a centrality selection via the number of hard particles. Such bias can be viewed as reweighting of configurations of small- x gluons. We find that the biased nuclear modification factor Q_pA(p_T) for central collisions is above R_pA(p_T) for minimum bias events, and that it may redevelop a “Cronin peak” even at small x . The magnitude of the peak is predicted to increase approximately like 1/A_⊥^ν, ν~0.6±0.1 , if one is able to select more compact configurations of the projectile proton where its gluons occupy a smaller transverse area A_⊥. We predict an enhanced Q_pp(p_T)–1~1/(p_T²)^ν and a Cronin peak even for central pp collisions.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: RIKEN; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: SC0012704

OSTI ID:: 1434787

Report Number(s):: BNL--203571-2018-JAAM

Journal Information:: Nuclear Physics. A, Journal Name: Nuclear Physics. A Journal Issue: C Vol. 974; ISSN 0375-9474

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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