Effects of threshold resummation

TL;DR

This paper examines the impact of threshold resummation on QCD predictions for jet production, highlighting the need for improved resummation methods to match experimental data.

Contribution

It provides a quantitative analysis of threshold resummation effects and emphasizes the importance of developing more accurate resummation formalisms.

Findings

Threshold resummation enhances NLO QCD jet predictions.

Enhancement is determined by small N behavior where current methods are unreliable.

More precise resummation formalism is needed for better predictions.

Abstract

We investigate effects of threshold resummation of logarithmic corrections $\ln N$ in Mellin space quantitatively. Threshold resummation leads to enhancement of next-to-leading-order QCD predictions for jet production at large jet transverse energy, which is in the trend indicated by experimental data. We show that this enhancement is completely determined by the behavior of threshold resummation at small $N$, the region where hierachy among different powers of $\ln N$ is lost and current next-to-leading-logarithm resummation is not reliable. Our analysis indicates that more accurate threshold resummation formalism should be developed in order to obtain convincing predictions.