The Ridge Associated with the Near-side Jet in High Energy-Heavy-Ion Collisions

TL;DR

This paper investigates the ridge phenomenon in high-energy heavy-ion collisions, revealing that ridge particles are medium partons kicked by jets, and characterizes their momentum distribution, suggesting flux tube particle production.

Contribution

It provides the first detailed analysis linking ridge particles to medium partons and characterizes their momentum distribution, highlighting a rapidity plateau structure.

Findings

Ridge particles are medium partons kicked by jets.

The parton momentum distribution exhibits a rapidity plateau.

The transverse momentum distribution is thermal-like.

Abstract

The ridge particles associated with a near-side jet are identified as medium partons kicked by the jet near the surface. They carry direct information on the parton momentum distribution at the moment of jet-parton collisions and the magnitude of the longitudinal momentum kick. The extracted early parton momentum distribution has a rapidity plateau structure with a thermal-like transverse momentum distribution. Such a rapidity plateau structure may arise from particle production in flux tubes, as color charges and anti-color charges separate at high energies.