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  • Letter
  • Open Access

Universal lepton universality violation in exclusive processes

Lin Dai1,*, Chul Kim2,†, and Adam K. Leibovich3,‡

  • 1Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
  • 2Institute of Convergence Fundamental Studies and School of Liberal Arts, Seoul National University of Science and Technology, Seoul 01811, Korea
  • 3Pittsburgh Particle Physics Astrophysics and Cosmology Center (PITT PACC) Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA

  • *dail@post.bgu.ac.il
  • †chul@seoultech.ac.kr
  • ‡akl2@pitt.edu
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Phys. Rev. D 105, L031301 – Published 3 February, 2022

DOI: https://doi.org/10.1103/PhysRevD.105.L031301

Abstract

In high energy exclusive processes involving leptons, QED corrections can be sensitive to infrared scales like the lepton mass and the soft photon energy cut, resulting in large logarithms that need to be resummed to all order in α. When considering the ratio of the exclusive processes between two different lepton flavors, the ratio R can be expressed in terms of factorized functions in the decoupled leptonic sectors. While some of the functional terms cancel, there remain the large logarithms due to the lepton mass difference and the energy cut. This factorization process can be universally applied to the exclusive processes such as Z→l+l− and B−→l−ν¯l, where the resummed result in the ratio gives significant deviations from the naive expectation from lepton universality.

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Phys. Rev. D 105, L031301– Published 3 February, 2022
  • Received 11 March 2021
  • Accepted 6 January 2022
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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.

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