Göttingen 2025 – scientific programme
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T: Fachverband Teilchenphysik
T 31: Flavour physics II
T 31.4: Talk
Tuesday, April 1, 2025, 17:00–17:15, VG 1.104
Heavy-to-light form factors to three loops — Matteo Fael1, Tobias Huber2, Fabian Lange3,4, •Jakob Müller2, Kay Schönwald3, and Matthias Steinhauser5 — 1Theoretical Physics Department, CERN — 2Theoretische Physik 1, CPPS, Universität Siegen — 3Physik-Institut, Universität Zürich — 4Paul Scherrer Institut, Villingen — 5Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology
In this talk, we discuss the computation of form factors for decays of heavy into light quarks at third order in QCD for various currents. We describe the different steps of the calculation and use the results to compute the hard matching coefficients in Soft-Collinear Effective Theory for all currents. Further, we extract the hard function in B → Xs γ to three loops using the tensor coefficients at light-like momentum transfer and study the impact of three-loop QCD corrections on partial decay rates in charged-current semi-leptonic B → Xu l ν decays, where the newly computed corrections to the vector and axialvector coefficients constitute an essential ingredient to carry out this analysis.