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Testing the running coupling kT -factorization formula for the inclusive gluon production

Durães, F. O.; Giannini, A. V.; Gonçalves, V. P. LU and Navarra, F. S. (2016) In Physical Review D - Particles, Fields, Gravitation and Cosmology 94(5).
Abstract

The inclusive gluon production at midrapidities is described in the color glass condensate formalism using the kT-factorization formula, which was derived at fixed coupling constant considering the scattering of a dilute system of partons with a dense one. Recent analysis demonstrated that this approach provides a satisfactory description of the experimental data for the inclusive hadron production in pp/pA/AA collisions. However, these studies are based on the fixed coupling kT-factorization formula. This formula does not take into account the running coupling corrections, which are important to set the scales present in the cross section. In this paper we consider the running coupling corrected kT-factorization formula conjectured... (More)

The inclusive gluon production at midrapidities is described in the color glass condensate formalism using the kT-factorization formula, which was derived at fixed coupling constant considering the scattering of a dilute system of partons with a dense one. Recent analysis demonstrated that this approach provides a satisfactory description of the experimental data for the inclusive hadron production in pp/pA/AA collisions. However, these studies are based on the fixed coupling kT-factorization formula. This formula does not take into account the running coupling corrections, which are important to set the scales present in the cross section. In this paper we consider the running coupling corrected kT-factorization formula conjectured some years ago and investigate the impact of the running coupling corrections on the observables. In particular, the pseudorapidity distributions and charged hadrons' multiplicity are calculated considering pp, dAu/pPb, and AuAu/PbPb collisions at RHIC and LHC energies. We compare the corrected running coupling predictions with those obtained using the original kT-factorization assuming a fixed coupling or a prescription for the inclusion of the running of the coupling. Considering the Kharzeev-Levin-Nardi unintegrated gluon distribution and a simplified model for the nuclear geometry, we demonstrate that the distinct predictions are similar for the pseudorapidity distributions in pp/pA/AA collisions and for the charged hadrons' multiplicity in pp/pA collisions. On the other hand, the running coupling corrected kT-factorization formula predicts a smoother energy dependence for dN/dη in AA collisions.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review D - Particles, Fields, Gravitation and Cosmology
volume
94
issue
5
publisher
American Physical Society
external identifiers
  • scopus:84990990225
  • wos:000383871400009
ISSN
1550-7998
DOI
10.1103/PhysRevD.94.054023
language
English
LU publication?
yes
id
76373d6e-a179-4aa4-bdf1-b74c85ba564c
date added to LUP
2016-11-03 09:23:38
date last changed
2017-01-01 08:38:22
@article{76373d6e-a179-4aa4-bdf1-b74c85ba564c,
  abstract     = {<p>The inclusive gluon production at midrapidities is described in the color glass condensate formalism using the kT-factorization formula, which was derived at fixed coupling constant considering the scattering of a dilute system of partons with a dense one. Recent analysis demonstrated that this approach provides a satisfactory description of the experimental data for the inclusive hadron production in pp/pA/AA collisions. However, these studies are based on the fixed coupling kT-factorization formula. This formula does not take into account the running coupling corrections, which are important to set the scales present in the cross section. In this paper we consider the running coupling corrected kT-factorization formula conjectured some years ago and investigate the impact of the running coupling corrections on the observables. In particular, the pseudorapidity distributions and charged hadrons' multiplicity are calculated considering pp, dAu/pPb, and AuAu/PbPb collisions at RHIC and LHC energies. We compare the corrected running coupling predictions with those obtained using the original kT-factorization assuming a fixed coupling or a prescription for the inclusion of the running of the coupling. Considering the Kharzeev-Levin-Nardi unintegrated gluon distribution and a simplified model for the nuclear geometry, we demonstrate that the distinct predictions are similar for the pseudorapidity distributions in pp/pA/AA collisions and for the charged hadrons' multiplicity in pp/pA collisions. On the other hand, the running coupling corrected kT-factorization formula predicts a smoother energy dependence for dN/dη in AA collisions.</p>},
  articleno    = {054023},
  author       = {Durães, F. O. and Giannini, A. V. and Gonçalves, V. P. and Navarra, F. S.},
  issn         = {1550-7998},
  language     = {eng},
  month        = {09},
  number       = {5},
  publisher    = {American Physical Society},
  series       = {Physical Review D - Particles, Fields, Gravitation and Cosmology},
  title        = {Testing the running coupling kT -factorization formula for the inclusive gluon production},
  url          = {http://dx.doi.org/10.1103/PhysRevD.94.054023},
  volume       = {94},
  year         = {2016},
}