Initial-state cold nuclear matter energy loss effects on inclusive jet production in p+A collisions at RHIC and LHC

TL;DR

This paper investigates how initial-state cold nuclear matter energy loss explains the observed nuclear modifications in inclusive jet production in p+A collisions at RHIC and LHC, showing good agreement in central collisions.

Contribution

It demonstrates that cold nuclear matter energy loss, including radiative corrections, can account for jet suppression in central p+A collisions at high energies.

Findings

Theoretical models with energy loss describe jet suppression in central collisions.

Scaling behavior of nuclear modification factor is explained by cold nuclear matter effects.

Peripheral collision enhancement suggests other mechanisms beyond cold nuclear matter effects.

Abstract

Recent measurements of the centrality and rapidity dependence of single inclusive jet production in p+Pb collisions at the LHC have revealed large and non-trivial nuclear modification of the production cross section for this process. In this paper, we explore to what extent such nuclear modification can be understood by the framework of standard cold nuclear matter effects, in particular initial-state cold nuclear matter energy loss. We demonstrate quantitatively that theoretical calculations which include medium-induced radiative corrections can describe rather reasonably the attenuation of the jet production yields in the large transverse momentum region in d+Au collisions at RHIC and p+Pb collisions at the LHC for central to semi-central collisions. We further show that the observed scaling behavior of the nuclear modification factor as a function of the total jet energy $p_T\, {\cosh} (y)$ for various rapidity intervals has a natural explanation in the picture of cold nuclear matter energy loss. On the other hand, the observed enhancement in peripheral collisions is not described in this picture and could have a different origin.