Sudakov Resummation Effects in Prompt-Photon Hadroproduction

TL;DR

This paper investigates the impact of soft-gluon resummation at next-to-leading-logarithmic accuracy on prompt-photon production in fixed-target experiments, showing it reduces theoretical uncertainties and aligns well with experimental data.

Contribution

It introduces a detailed calculation of soft-gluon resummation effects at NLL level in prompt-photon hadroproduction, improving theoretical predictions.

Findings

Large corrections at high renormalization scales

Reduced scale dependence of predictions

Good agreement with experimental measurements

Abstract

We compute the effects of soft-gluon resummation, at the next-to-leading-logarithmic level, in the fixed-target hadroproduction cross section for prompt photons. We find in general that the corrections to the fixed next-to-leading-order results are large for large renormalization scales, and small for small scales. This leads to a significant reduction of the scale dependence of the results for most experimental configurations of interest. We compare our results to the recent measurements by the E706 and UA6 collaborations.