Dijet azimuthal decorrelations for $\Delta \phi_{\rm dijet} < 2\pi/3$ in perturbative QCD

TL;DR

This paper identifies and corrects an inconsistency in perturbative QCD predictions for dijet azimuthal decorrelations at certain angles, improving the accuracy and data agreement of the theoretical calculations.

Contribution

The authors reveal a key inconsistency in previous perturbative QCD calculations and propose modifications that enhance prediction accuracy and reduce scale dependence.

Findings

Corrected predictions show smaller scale dependence.

Improved agreement with experimental data.

Recommendations for future measurement definitions.

Abstract

We point out an inconsistency in perturbative QCD predictions previously used for dijet azimuthal decorrelations for azimuthal angles of $\Delta\phi_{\rm dijet} < 2\pi/3$ between the two jets. We show how the inconsistency arises and how the calculations can be modified to provide more accurate results that exhibit a smaller scale dependence and give a better description of the data than the inconsistent results. We also explain how the quality of the predictions strongly depends on a perceivedly minor detail in the definition of the dijet phase space and give recommendations for future measurements.