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)

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

Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
169715		Phenomenology from Lattice QCD and collider physics	Christine Davies	Science and Technology Facilities Council (STFC)	ST/L000466/1	P&S - Physics & Astronomy
173809		Phenomenology from Lattice QCD and Collider Physics	Christine Davies	Science and Technology Facilities Council (STFC)	ST/P000746/1	P&S - Physics & Astronomy