Correlations and the ridge in the Color Glass Condensate beyond the glasma graph approximation

Tolga Altinoluk, Néstor Armesto, Douglas E. Wertepny

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We consider two-gluon production in dilute-dense collisions within the Color Glass Condensate framework, applicable to both proton-nucleus and heavy-light ion collisions. We go beyond the glasma graph approximation which is valid in the dilute-dilute limit and show the correspondence between the glasma graphs and the kT-factorized approach that we use in our calculation. We then identify the classical uncorrelated, and the Hanbury-Brown-Twiss (HBT) and Bose enhancement correlated contributions, with the Bose enhancement contribution being suppressed by the number of degrees of freedom with respect to the uncorrelated piece. We show that both the HBT and the Bose enhancement pieces survive the inclusion of higher order contributions in density and that they stem from the quadrupole piece of the two-gluon inclusive cross section. Finally, we illustrate the results using a toy model that allows a simple numerical implementation.

Original languageEnglish
Article number207
JournalJournal of High Energy Physics
Issue number5
StatePublished - 1 May 2018
Externally publishedYes


  • Heavy Ion Phenomenology

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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