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T: Fachverband Teilchenphysik

T 31: Flavour physics II

T 31.10: Vortrag

Dienstag, 16. März 2021, 18:15–18:30, Tf

QED effects and factorization in charmless B decays — Martin Beneke¹, Philipp Böer¹, •Jan-Niklas Toelstede¹, and Keri Vos² — ¹Technical University of Munich — ²Maastricht University

In the heavy-quark limit, hadronic matrix elements of B-meson decays into two light charmless final-state mesons factorize to all orders in the strong coupling into universal hadronic quantities (form factors and light-cone distribution amplitudes) as well as process-dependent hard-scattering kernels. Within the framework of Soft-Collinear Effective Theory, we generalize the QCD factorization to include QED corrections and show that it retains its QCD form. However, the presence of electrically charged final state mesons requires to introduce modified hadronic functions that become process-dependent to a certain extent as soft photons do not decouple completely. It further leads to interesting and qualitatively new features, in particular regarding the renormalization group of these objects, that will be discussed in this presentation, as well as the size of QED corrections on selected observables for π K final states.