New physics contributions to moments of inclusive b → c semileptonic decays

A bstract Inclusive semileptonic B → X c ℓ ν ¯ ℓ decays, where ℓ = μ, e , are by now standard candles in the determination of the CKM element | V cb |. These determinations rely on the heavy-quark expansion and use moments of decay spectra to extract the non-perturbative parameters directly from dat...

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Bibliographic Details
Published in:The journal of high energy physics 2023-02, Vol.2023 (2), p.86-29, Article 86
Main Authors: Fael, Matteo, Rahimi, Muslem, Vos, K. Keri
Format: Article
Language:English
Subjects:
Approximation
Bottom Quarks
Classical and Quantum Gravitation
Decay
Elementary Particles
High energy physics
Leptons
Other Weak Scale BSM Models
Particle physics
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quarks
Regular Article - Theoretical Physics
Relativity Theory
Semi-Leptonic Decays
String Theory
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Summary:A bstract Inclusive semileptonic B → X c ℓ ν ¯ ℓ decays, where ℓ = μ, e , are by now standard candles in the determination of the CKM element | V cb |. These determinations rely on the heavy-quark expansion and use moments of decay spectra to extract the non-perturbative parameters directly from data under the standard model assumption. At the same time, new physics could influence the moments of the inclusive decay. In this paper, we compute power-corrections and next-to-leading order corrections in the strong coupling constant using the full basis of dimension-six new physics operators for the inclusive B → X c ℓ ν ¯ decay. We provide predictions for lepton energy, hadronic and leptonic invariant mass moments, and perform a phenomenological study to show the possible impact of new physics. Our results could be used to perform a global fit including new physics contributions.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP02(2023)086