We establish refactorisation conditions between the subleading O8-O8 contributions to the inclusive Bˉ→Xsγ decay suffering from endpoint divergences and prove a factorisation theorem for these contributions to all orders in the strong coupling constant. This allows for higher-order calculations of the resolved contributions and consistent summation of large logarithms, consequently reducing the recently found large-scale dependence in these contributions. We implement the concept of refactorisation in a heavy flavour application of SCET, which includes nonperturbative functions as additional subtlety not present in collider applications.
@article{arxiv.2301.01739,
title = {Refactorisation in subleading $\bar B \to X_s \gamma$},
author = {Tobias Hurth and Robert Szafron},
journal= {arXiv preprint arXiv:2301.01739},
year = {2023}
}