Ridge from jet-medium interaction in p-Pb collisions at $\sqrt{s_{NN} }$ = 5.02 TeV

TL;DR

This paper investigates the origin of the ridge-like structure in high-multiplicity p-Pb collisions at 5.02 TeV, attributing it to jet-medium interactions modeled with EPOS 3, which incorporates hydrodynamics, jets, and flux tube dynamics.

Contribution

It introduces a detailed EPOS 3 model analysis showing how core-corona interactions contribute to the ridge phenomenon in p-Pb collisions.

Findings

Core-corona correlations significantly influence the ridge.

Higher flux tube density increases core-corona interactions.

The model reproduces the multiplicity evolution of the ridge.

Abstract

In this paper we report the effect of the jet-medium interplay as implemented in EPOS 3 on the ridge like structure observed in high multiplicity p-Pb collisions at $\sqrt{s_{NN}} = $ 5.02 TeV. EPOS 3 takes into account hydrodynamically expanding bulk matter, jets and the jet-medium interaction. The basis of this model is multiple scatterings where each scattering finally produces flux tube / string. In the higher multiplicity event classes where the flux tube/string density is higher, there is a finite probability that the strings will pick up quarks and antiquarks (or diquarks) from the bulk (core) for flux tube breaking to produce jet hadrons (corona) instead of producing them via usual Schwinger mechanism. This will eventually create a correlation between core and corona and also influence the corona-corona correlation as the corona particles containing quarks and antiquarks (or diquarks) from the bulk also carry the fluid information. We report the relative contributions of the core-core, core-corona, corona-core and corona-corona correlations towards the ridge in the high and low multiplicity p-Pb collisions at $\sqrt{s_{NN}} = $ 5.02 TeV using the data generated by EPOS 3. The multiplicity evolution of the ridges in all the cases is also reported.