• Open Access

Form-factor-independent test of lepton universality in semileptonic heavy meson and baryon decays

Stefan Groote, Mikhail A. Ivanov, Jürgen G. Körner, Valery E. Lyubovitskij, Pietro Santorelli, and Chien-Thang Tran
Phys. Rev. D 103, 093001 – Published 11 May 2021

Abstract

In the semileptonic decays of heavy mesons and baryons, the lepton-mass dependence factors out in the quadratic cos2θ coefficient of the differential cosθ distribution. We call the corresponding normalized coefficient the convexity parameter. This observation opens the path to a test of lepton universality in semileptonic heavy meson and baryon decays that is independent of form-factor effects. By projecting out the quadratic rate coefficient, dividing out the lepton-mass-dependent factor, and restricting the phase space integration to the τ lepton phase space, one can define optimized partial rates which, in the Standard Model, are the same for all three (e,μ,τ) modes in a given semileptonic decay process. We discuss how the identity is spoiled by new physics effects. We discuss semileptonic heavy meson decays such as B¯0D(*)+ν¯ and BcJ/ψ(ηc)ν¯ and semileptonic heavy baryon decays such as ΛbΛcν¯ for each =e, μ, τ.

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  • Received 25 February 2021
  • Accepted 4 April 2021

DOI:https://doi.org/10.1103/PhysRevD.103.093001

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

Stefan Groote1,*, Mikhail A. Ivanov2,†, Jürgen G. Körner3,‡, Valery E. Lyubovitskij4,5,6,7,§, Pietro Santorelli8,9,∥, and Chien-Thang Tran8,9,10,¶

  • 1Füüsika Instituut, Tartu Ülikool, W. Ostwaldi 1, EE-50411 Tartu, Estonia
  • 2Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
  • 3PRISMA+ Cluster of Excellence, Institut für Physik, Johannes Gutenberg-Universität, D-55099 Mainz, Germany
  • 4Institut für Theoretische Physik, Universität Tübingen, Kepler Center for Astro and Particle Physics, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
  • 5Departamento de Física y Centro Científico Tecnológico de Valparaíso-CCTVal, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile
  • 6Department of Physics, Tomsk State University, 634050 Tomsk, Russia
  • 7Tomsk Polytechnic University, 634050 Tomsk, Russia
  • 8Dipartimento di Fisica “E. Pancini,” Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, Via Cintia, Edificio 6, 80126 Napoli, Italy
  • 9Istituto Nazionale di Fisica Nucleare, Sezione di Napoli, 80126 Napoli, Italy
  • 10Department of Physics, Faculty of Applied Sciences, HCMC University of Technology and Education, Vo Van Ngan 1, Thu Duc, Ho Chi Minh City, Vietnam

  • *stefan.groote@ut.ee
  • ivanovm@theor.jinr.ru
  • jukoerne@uni-mainz.de
  • §valeri.lyubovitskij@uni-tuebingen.de
  • Pietro.Santorelli@na.infn.it
  • thangtc@hcmute.edu.vn

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Vol. 103, Iss. 9 — 1 May 2021

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