Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 29: Flavour Physics II
T 29.8: Talk
Tuesday, March 17, 2026, 18:00–18:15, KH 01.011
B-meson decay width up to 1/mb3 corrections within and beyond the Standard Model — •Ali Mohamed1, Alexander Lenz1, Martin Lang1, Maria Laura Piscopo2,3, and Alexey Rusov4 — 1Siegen University, Siegen, Germany — 2Nikhef, Amsterdam, Netherlands — 3Vrije Universiteit Amsterdam, Amsterdam, Netherlands — 4Technische Universität München, München, Germany
We determine subleading power corrections to heavy-hadron decay rates within and beyond the Standard Model. In the SM, we compute previously unknown penguin-induced contributions to the chromomagnetic (1/mQ2) and Darwin (1/mQ3) operators in the Heavy Quark Expansion, improving predictions for B-hadron lifetimes.
Motivated by tensions in colour-allowed non-leptonic decays, we extend the analysis to a general BSM framework and provide complete contributions to the Wilson coefficients of the chromomagnetic and Darwin operators, including the calculation of BSM Weak Annihilation contributions. This completes the dimension-six BSM operator basis for non-leptonic decays.
Our results enable precise global SM analyses and model-independent new physics searches using lifetime observables such as τ(Bs)/τ(Bd), closing a critical gap in the theoretical description of these quantities.
Keywords: B-Meson decays; Heavy Quark Expansion; Flavour Physics; model independent BSM; Penguin Operators