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Volume 375 - 14th International Symposium on Radiative Corrections (RADCOR2019) - B Decay
Completing the four-body contributions to $\bar{B}\rightarrow X_s \gamma$ at NLO
L.T. Moos,* T. Huber
*corresponding author
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Pre-published on: 2019 December 19
Published on: 2020 February 18
We report on the status of the ongoing calculation of multiparticle contributions to the inclusive radiative $\bar{B} \rightarrow X_s \gamma$ decay at next-to leading order. This effort amounts to the evaluation of the four-particle process $b\rightarrow s \bar{q} q \gamma$ at the one-loop level, supplemented by the corresponding five-particle tree-level cuts $b\rightarrow s \bar{q} q \gamma + g$ of the gluon bremsstrahlung. Knowledge of these pieces will formally complete the $\bar{B} \rightarrow X_s \gamma$ decay at the next-to-leading order. The different steps such as the generation of the amplitude, its
renormalization, and the treatment of occuring IR-divergences are discussed. Moreover, we elaborate on the subtleties that arise when treating $\gamma_5$ in $D$ dimensions.
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