Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 71: Theorie: Flavorphysik

T 71.1: Talk

Wednesday, March 27, 2019, 16:00–16:15, H11

B → π, K, D and B → ρ, K^*, D^* Form Factors from B-Meson Light-Cone Sum Rules — •Nico Gubernari, Danny Van Dyk, and Ahmet Kokulu — Technische Universität München, München, Germany

Our understanding of semileptonic B decays depends on accurate estimates of hadronic matrix elements. The latter are usually expressed in terms of form factors, which are functions of the momentum transfer. We calculate the B → π, K, D and B → ρ, K^*, D^* form factors in the framework of QCD Light-Cone Sum Rules (LCSRs) with B-meson distribution amplitudes. Our calculation improves upon previous studies by including higher twist contributions and the full set of the three-particle distribution amplitudes. Our LCSR results are complementary to present and future Lattice QCD studies. Finally, we discuss selected phenomenological implications of our results, giving predictions for the Lepon-Flavour Universality ratios R(D) and R(D^*).