Approaches to inclusive semileptonic B(s)-meson decays from Lattice QCD
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 tension between the inclusive and exclusive determinations of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements |Vcb| and |Vub|. We present results from a pilot lattice computation for Bs→Xclνl, 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.
hep-lat, hep-ph
Barone, Alessandro
6101b472-6a3f-4f75-81c5-1987eeb455db
Hashimoto, Shoji
2b3be047-9e76-42d7-ba7e-50f230e88446
Jüttner, Andreas
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
Kaneko, Takashi
c02e60bd-618e-4c8a-b0e1-22a19d877c50
Kellermann, Ryan
e648d747-545c-4371-b656-7638b10ac138
18 July 2023
Barone, Alessandro
6101b472-6a3f-4f75-81c5-1987eeb455db
Hashimoto, Shoji
2b3be047-9e76-42d7-ba7e-50f230e88446
Jüttner, Andreas
a90ff7c5-ae8f-4c8e-9679-b5a95b2a6247
Kaneko, Takashi
c02e60bd-618e-4c8a-b0e1-22a19d877c50
Kellermann, Ryan
e648d747-545c-4371-b656-7638b10ac138
Barone, Alessandro, Hashimoto, Shoji, Jüttner, Andreas, Kaneko, Takashi and Kellermann, Ryan
(2023)
Approaches to inclusive semileptonic B(s)-meson decays from Lattice QCD.
JHEP, 2023, [145].
(doi:10.1007/JHEP07(2023)145).
Abstract
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 |Vcb| and |Vub|. We present results from a pilot lattice computation for Bs→Xclνl, 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.
Text
2305.14092v2
- Author's Original
Text
JHEP07(2023)145
- Version of Record
More information
Submitted date: 23 May 2023
Accepted/In Press date: 4 July 2023
Published date: 18 July 2023
Keywords:
hep-lat, hep-ph
Identifiers
Local EPrints ID: 478297
URI: http://eprints.soton.ac.uk/id/eprint/478297
ISSN: 1126-6708
PURE UUID: 42f5debd-5b1c-4598-bced-c439828056fe
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Date deposited: 27 Jun 2023 17:22
Last modified: 12 Jul 2024 02:04
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Author:
Shoji Hashimoto
Author:
Takashi Kaneko
Author:
Ryan Kellermann
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