Jet-parton inelastic interaction beyond eikonal approximation

TL;DR

This paper investigates the limitations of the eikonal approximation in jet quenching models, demonstrating that non-eikonal effects cause notable suppression in moderate and low momentum jet processes, impacting hadronic spectra predictions.

Contribution

It introduces a relaxation of the eikonal approximation for 2-->3 processes, revealing significant non-eikonal effects on jet scattering angular distributions and cross-sections.

Findings

15-20% suppression in differential cross-section for moderate jets due to non-eikonal effects

Forbidden scattering angles wider than ±0.52π for qq' --> qq'g process

Angular range for gg --> ggg process remains ±π, unaffected by non-eikonal effects

Abstract

Most of the models of jet quenching generally assumes that a jet always travels in a straight eikonal path, which is indeed true for sufficiently hard jet but may not be a good one for moderate and low momentum jet. In this article an attempt has been made to relax part of this approximation for 2 --> 3 processes and found a (15-20)% suppression in the differential cross-section for moderately hard jets because of the noneikonal effects. In particular, for the process qq' --> qq'g in the centre of momentum frame the scattering with an angle wider than \pm 0.52\pi, is literally forbidden unlike the process gg --> ggg that allows an angular range \pm \pi. This may have consequence on the suppression of hadronic spectra at low transverse momenta.