Decays of B-mesons play an important role in precision tests of the flavour-structure of the Standard Model of particle physics, as well as in indirect searches for novel "New Physics" phenomena. On the one hand, precise theoretical predictions for B-meson decays are inevitable to draw reliable conclusions from the expected high-precision measurements by the LHCb and BELLE II experiments. On the other hand, the non-perturbative hadronic environment makes these particularly challenging tasks. A first principles approach for the theoretical description of B-meson decays into light and energetic final-state particles is the so-called factorization approach, which in the modern language of effective field theories is formalized as the Soft-Collinear Effective Theory. In this talk we will discuss recent developments on how subdominant effects can be systematically included within this framework. First, we will discuss how a factorization theory of electromagnetic effects can be achieved for non-leptonic decay amplitudes, and the second part focusses on power-corrections in the large mass/energy expansion for the purely radiative decay into two photons.
Online via ZOOM:
Meeting ID: 984 5733 2925
Peter Thirolf (LMU) / Norbert Kaiser (TUM)