• Open Access

R(J/ψ) and BcJ/ψν¯l Lepton Flavor Universality Violating Observables from Lattice QCD

Judd Harrison, Christine T. H. Davies, and Andrew Lytle (HPQCD Collaboration)
Phys. Rev. Lett. 125, 222003 – Published 24 November 2020

Abstract

We use our lattice QCD computation of the BcJ/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(BcJ/ψτν¯τ)/B(BcJ/ψμν¯μ). We find R(J/ψ)=0.2582(38) 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 BD*ν, to BcJ/ψν and make predictions for their values under different new physics scenarios.

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  • Received 22 July 2020
  • Accepted 15 October 2020

DOI:https://doi.org/10.1103/PhysRevLett.125.222003

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & Fields

Authors & Affiliations

Judd Harrison1,*, Christine T. H. Davies1,†, and Andrew Lytle2 (HPQCD Collaboration)

  • 1SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, United Kingdom
  • 2INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica 1, 00133 Roma RM, Italy

See Also

BcJ/ψ form factors for the full q2 range from lattice QCD

Judd Harrison, Christine T. H. Davies, and Andrew Lytle (HPQCD Collaboration)
Phys. Rev. D 102, 094518 (2020)

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Vol. 125, Iss. 22 — 27 November 2020

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