The photon energy spectrum in $B\to X_s\gamma$ at N${}^3$LL${}^{\prime }$

Bahman Dehnadi, Ivan Novikov, Frank J. Tackmann

We present predictions for the photon energy spectrum in inclusive $B\to X_s\gamma$ decays mediated by the electromagnetic penguin operator $O_7$ to N${}^3$LL${}^{\prime }$. We use soft-collinear ef…