Punch-through jets in $A+A$ collisions at RHIC/LHC

TL;DR

This paper investigates high transverse momentum jet production and suppression in heavy-ion collisions at RHIC and LHC, highlighting the role of punch-through jets and their sensitivity to medium properties and initial parton distributions.

Contribution

It introduces a combined analysis of single and dihadron spectra using NLO pQCD with jet quenching, revealing the significance of punch-through jets at LHC.

Findings

Dihadron suppression is more sensitive to medium effects than single hadron suppression at RHIC.

Punch-through jets dominate high pT dihadron production at LHC.

Dihadron spectra are more affected by initial parton distributions than single hadron spectra.

Abstract

High $p_T$ single and dihadron production is studied within a NLO pQCD parton model with jet quenching in high energy $A+A$ collisions at the RHIC/LHC energy. A simultaneous $\chi^2$-fit to both single and dihadron spectra can be achieved within a narrow range of energy loss parameter. Punch-through jets are found to result in the dihadron suppression factor slightly more sensitive to medium than the single hadron suppression factor at RHIC. Such jets at LHC are found to dominate high $p_T$ dihadron production and the resulting dihadron spectra are more sensitive to the initial parton distribution functions than the single hadron spectra.