SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 2: Flavor I
T 2.2: Vortrag
Montag, 20. März 2023, 16:45–17:00, HSZ/0004
Taming New Physics in b → c ū d (s) with τ(B+)/τ(Bd) and asld — Alexander Lenz, •Jakob Müller, Maria Laura Piscopo, and Aleksey V. Rusov — Center for Particle Physics Siegen, Theoretische Teilchenphysik, Universität Siegen
Inspired by the recently observed tensions between the experimental data and the theoretical predictions, based on QCD factorisation, for several colour-allowed non-leptonic B-meson decays, we study the potential size of new physics (NP) effects in the decay channels b → c ū d(s). Starting from the most general effective Hamiltonian describing the b → c ū d(s) transitions, we compute NP contributions to the theoretical predictions of B-meson lifetime and of B-mixing observables. The well-known lifetime ratio τ(B+)/τ(Bd) and the experimental bound on the semi-leptonic CP asymmetry asld, provide strong, complementary constraints on some of the NP Wilson coefficients.