The Nuclear Suppression Factor for P_T increasing towards the Kinematic Limit

TL;DR

This paper investigates how the nuclear suppression factor R_AA behaves at very high transverse momentum P_T, especially near the kinematic limit, exploring mechanisms that prevent it from approaching unity.

Contribution

It provides model predictions and discusses mechanisms affecting R_AA at the P_T limit, highlighting complexities beyond simple expectations.

Findings

R_AA may not approach 1 at high P_T due to multiple mechanisms.

Different models predict varying P_T dependence near the kinematic limit.

Predictions are made for RHIC and LHC energies.

Abstract

The suppression of high transverse momentum P_T hadron production in ultrarelativistic heavy-ion (A-A) collisions as compared to the scaled expectation from proton-proton (p-p) collisions expressed as the nuclear modification factor R_AA is experimentally well established and can be traced back to interactions between the hard parton shower and the soft bulk matter. Physical intuition suggests that the medium modification should cease to be important when the hard scale of parton production is much larger than the typical momentum scale in the medium (e.g. the temperature T) and that consequently R_AA(P_T) -> 1 for P_T >> T. However, R_AA is not a 'simple' observable, but rather results from many different mechanisms which influence what happens when P_T increases. In particular, R_AA does not necessarily approch unity even if the hadron momentum is probed at the kinematic limit of the reaction. The aim of this work is to identify and discuss such mechanisms and to present different model expectations of what one would find if one could measure suppression out to the kinematic limit for hard hadron production and give predictions for the P_T dependence at both RHIC and LHC.