QCD Corrections to the Radiative Decay B -> X_s gamma

TL;DR

This paper reviews the calculation of advanced QCD corrections to the B -> X_s gamma decay, highlighting recent progress, technical methods, and comparison with experimental data to refine theoretical predictions.

Contribution

It provides a comprehensive overview of the NNLO QCD correction calculations for B -> X_s gamma decay, emphasizing new computational techniques and updated theoretical estimates.

Findings

NNLO QCD corrections significantly improve decay rate predictions

Theoretical estimates now closely match experimental measurements

Residual uncertainties are analyzed and discussed

Abstract

In this short review, the calculation of the next-to-next-to-leading order QCD corrections to the inclusive radiative decay B -> X_s gamma is described. I summarize the salient features of the calculational framework adopted, discuss the results obtained in the last few years, and indicate the technical tools that made the NNLO calculations possible. I conclude by comparing the current NNLO theoretical estimate for the branching ratio with the experimental measurement and by briefly discussing the size and origin of the residual theoretical uncertainty.