Ridge Structure associated with the Near-Side Jet in the (Delta phi)-(Delta eta) Correlation

TL;DR

This paper explains the ridge structure in near-side jet correlations in heavy-ion collisions using the momentum kick model, suggesting it can probe the parton momentum distribution and temperature at the collision moment.

Contribution

It introduces the momentum kick model as a mechanism for the ridge structure, linking it to medium partons and their properties during jet-parton collisions.

Findings

Ridge structure can be explained by medium partons receiving a momentum kick.

Parton temperature at collision is slightly higher than at the end of the collision.

Rapidity width of partons is substantially greater at the collision moment.

Abstract

In the (Delta phi)-(Delta eta) correlation associated with a near-side jet observed by the STAR Collaboration in heavy-ion collisions at RHIC [Ref. 1-6], the ridge structure can be explained by the momentum kick model in which the ridge particles are identified as medium partons which suffer a collision with the jet and acquire a momentum kick along the jet direction. If this is indeed the correct mechanism, the ridge structure associated with the near-side jet may be used to probe the parton momentum distribution at the moment of the jet-parton collision, leading to the result that at that instant the parton temperature is slightly higher and the rapidity width substantially greater than corresponding quantities of their evolution product inclusive particles at the end point of the nucleus-nucleus collision.