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Approaches to inclusive semileptonic B$_{(s)}$-meson decays from Lattice QCD

We address the nonperturbative calculation of the inclusive decay rate of semileptonic B$_{(s)}$-meson decays from lattice QCD. Precise Standard-Model predictions are key ingredients in searches for new physics, and this type of computation may eventually provide new insight into the long-standing t...

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Detalles Bibliográficos
Autores principales: Barone, Alessandro, Hashimoto, Shoji, Jüttner, Andreas, Kaneko, Takashi, Kellermann, Ryan
Lenguaje:eng
Publicado: 2023
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP07(2023)145
http://cds.cern.ch/record/2862890
Descripción
Sumario:We address the nonperturbative calculation of the inclusive decay rate of semileptonic B$_{(s)}$-meson decays from lattice QCD. Precise Standard-Model predictions are key ingredients in searches for new physics, and this type of computation may eventually provide new insight into the long-standing tension between the inclusive and exclusive determinations of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements |V$_{cb}$| and |V$_{ub}$|. We present results from a pilot lattice computation for B$_{s}$ → X$_{c}$lν$_{l}$, where the initial b quark described by the relativistic-heavy-quark (RHQ) formalism on the lattice and the other valence quarks discretised with domain-wall fermions are simulated approximately at their physical quark masses. We compare two different methods for computing the decay rate from lattice data of Euclidean n-point functions, namely Chebyshev and Backus-Gilbert approaches. We further study how much the ground-state meson dominates the inclusive decay rate and indicate our strategy towards a computation with a more comprehensive systematic error budget.