The main focus of project C1b are lifetimes and inclusive decays of B and D mesons. Based on the Heavy Quark Expansion a systematic expansion of the physical quantities are obtained as an expansion in the inverse heavy quark mass. Several matching coefficient are computed to higher order in perturbative QCD and their phenomenological implications are studied.
Project Topics
Γq12 to NNLO for mc=0
will reduce perturbative uncertainty of leading-power contribution to ΔΓs from ∼10% to ∼3%
requires solution of new three-loop integral families
Γq12 at order αs/mb
needed to reduce overall uncertainty in ΔΓq/ΔMq well below 10\%
τ(B+)/τ(Bd) and τ(Ξ0b)/τ(Ξ−b) at orders α2s and αs/mb
tests the formalism (HQE and lattice calculations)
Charm hadron lifetimes
tests the HQE at order 1/mQ
τ(Bs)/τ(Bd) and τ(Λb)/τ(Ξ0b)
probes new physics in penguin coefficients
Γq12 to NNLO at order m2c/m2b
NNLO accuracy for adfs, which probes new physics in e.g. b→dˉqq decays
Phenomenological studies
devise judicious combinations to reduce hadronic uncertainties
propose new observables
Related publications
P3H-24-085
Title: Towards a SM prediction for CP violation in charm
Type: Paper
Authors: Alexander Lenz, Maria Laura Piscopo, Aleksey V. Rusov
Info: Contribution to the Proceedings of the 20th International Conference on B-Physics at Frontier Machines (Beauty 2023), 3-7 July 2023, Clermont-Ferrand, France
P3H-24-084
Title: Lifetimes of b-hadrons and mixing of neutral B-mesons: theoretical and experimental status
Type: Paper
Authors: Johannes Albrecht, Florian Bernlochner, Alexander Lenz, Aleksey Rusov
Info: Published in Phys.Rev.Lett. 129 (2022) 10, 102001
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