R(J/ψ) and B−c → J/ ψℓ−¯νl lepton flavor universality violating observables from lattice QCD

Harrison, J., Davies, C. T.H. and Lytle, A. (2020) R(J/ψ) and B−c → J/ ψℓ−¯νl lepton flavor universality violating observables from lattice QCD. Physical Review Letters, 125(22), 222003. (doi: 10.1103/PhysRevLett.125.222003)

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Abstract

We use our lattice QCD computation of the Bc→J/ψ form factors to determine the differential decay rate for the semitauonic decay channel and construct the ratio of branching fractions R(J/ψ)=B(B−c→J/ψτ−ντ)/B(B−c→J/ψμ−νμ). We find R(J/ψ)=\rjpsi and give an error budget. We also extend the relevant angular observables, which were recently suggested for the study of lepton flavor universality violating effects in B→D∗ℓν, to Bc→J/ψℓν and make predictions for their values under different new physics scenarios.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Lytle, Dr Andrew and Harrison, Dr Judd and Davies, Professor Christine
Authors: Harrison, J., Davies, C. T.H., and Lytle, A.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
Published Online:24 November 2020
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Physical Review Letters 125(22):222003
Publisher Policy:Reproduced under a Creative Commons licence

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