The $Q_{1,2} – Q_7$ interference contributions to b → sγ at $O(α^2_s )$ for the physical value of $m_c$

Abstract

The $$\bar{B}\rightarrow X_s\gamma $$ branching ratio is currently measured with around $$5%$$ accuracy. Further improvement is expected from Belle II. To match such a precision on the theoretical side, evaluation of $${\mathcal O}(\alpha _{\mathrm s}^2)$$ corrections to the partonic decay $$b \rightarrow X_s^\textrm{part}\gamma $$ are necessary, which includes the $$b \rightarrow s \gamma $$, $$b \rightarrow s g\gamma $$, $$b \rightarrow s gg\gamma $$, $$b \rightarrow sq\bar{q}\gamma $$ Show more