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T: Fachverband Teilchenphysik

T 8: Flavour Physics I

T 8.4: Vortrag

Montag, 16. März 2026, 17:00–17:15, KH 01.011

One-loop improved modelling of hadronic light-cone distributions amplitudes in HQET — Riccardo Bartocci¹, Philipp Böer², Max Ferré³, Thorsten Feldmann⁴, Nico Gubernari⁵, and •Daniel Vladimirov⁴ — ¹Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — ²CERN, Theoretical Physics Department, CH-1211 Geneva 23, Switzerland — ³PRISMA+ Cluster of Excellence & Mainz Institute for Theoretical Physics, Johannes Gutenberg University, D-55099 Mainz, Germany — ⁴Center for Particle Physics Siegen, Universität Siegen, 57068 Siegen, Germany — ⁵Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115 Bonn, Germany

Light-cone distribution amplitudes (LCDAs) parametrize the relevant hadronic information in factorization-based predictions for exclusive reactions with large energy/momentum transfer. In this talk we focus on the LCDAs of heavy hadrons containing one heavy b-quark in the framework of heavy-quark effective theory (HQET). We explain how theoretical information about the so-called ”radiative tail” in fixed-order perturbation theory can be consistently implemented in the construction of models or generic parametrizations of the LCDAs. As a specific example, we apply our approach to a generalized 3-particle LCDA of the B-meson, where the light quark and gluon field are separated along opposite light-cone directions, and briefly discuss the phenomenological relevance for rare exclusive B-meson decays.

Keywords: Heavy flavours; QCD factorization; Heavy quark effective theory