NLL Corrections for B-Meson Radiative Exclusive Decays

TL;DR

This paper computes next-to-leading order corrections to the B→K*γ decay, reducing theoretical uncertainties and improving agreement with experimental data by about 10%.

Contribution

It provides the first detailed calculation of NLL corrections for this decay, refining theoretical predictions.

Findings

Corrections increase the branching ratio by ~10%.

Reduced renormalization scale dependence.

Results remain consistent with experimental measurements.

Abstract

We calculate the next-to-leading corrections to the branching ratio of exclusive $B\to K^* \gamma$ decay. The renormalization scale dependence is reduced compared to the leading logarithmic result but there remains a dependence on a cutoff parameter of the hadronic model. The calculated corrections increase the predicted branching ratio by about 10%, but it remains in agreement with the experimental value.