skip to main content

This content will become publicly available on October 21, 2017

Title: Forward J/ψ production at high energy: Centrality dependence and mean transverse momentum

Forward rapidity J/$$\psi$$ meson production in proton-nucleus collisions can be an important constraint of descriptions of the small- x nuclear wave function. In an earlier work we studied this process using a dipole cross section satisfying the Balitsky-Kovchegov equation, fit to HERA inclusive data and consistently extrapolated to the nuclear case using a standard Woods-Saxon distribution. In this paper we present further calculations of these cross sections, studying the mean transverse momentum of the meson and the dependence on collision centrality. We also extend the calculation to backward rapidities using nuclear parton distribution functions. Here, we show that the parametrization is overall rather consistent with the available experimental data. However, there is a tendency towards a too strong centrality dependence. This can be traced back to the rather small transverse area occupied by small- x gluons in the nucleon that is seen in the HERA data, compared to the total inelastic nucleon-nucleon cross section.
Authors:
 [1] ;  [1] ;  [2]
  1. Univ. of Jyvaskyla (Finland). Dept. of Physics; Univ. of Helsinki (Finland). Helsinki Inst. of Physics
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
Publication Date:
OSTI Identifier:
1351720
Report Number(s):
BNL-113690-2017-JA
Journal ID: ISSN 2470-0010; PRVDAQ; R&D Project: KB0301020; KB0301020; TRN: US1701347
Grant/Contract Number:
SC0012704; 267321; 273464
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 7; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); Academy of Finland
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS