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Title: A challenge to lepton universality in B-meson decays

One of the key assumptions of the standard model of particle physics is that the interactions of the charged leptons, namely electrons, muons and taus, differ only because of their different masses. Whereas precision tests comparing processes involving electrons and muons have not revealed any definite violation of this assumption, recent studies of B-meson decays involving the higher-mass tau lepton have resulted in observations that challenge lepton universality at the level of four standard deviations. Here, a confirmation of these results would point to new particles or interactions, and could have profound implications for our understanding of particle physics.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Nikhef National Inst. for Subatomic Physics, Amsterdam (The Netherlands)
  2. Univ. of California, Santa Barbara, CA (United States)
  3. Univ. of Maryland, College Park, MD (United States)
  4. Univ. of Victoria, BC (Canada)
  5. Ludwig Maximilians Univ., Munich (Germany)
  6. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Nagoya Univ. (Japan). Kobayashi-Maskawa Inst.
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Nature (London)
Additional Journal Information:
Journal Name: Nature (London); Journal Volume: 546; Journal Issue: 7657; Journal ID: ISSN 0028-0836
Publisher:
Nature Publishing Group
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF); Japan Society for the Promotion of Science (JSPS); Natural Sciences and Engineering Research Council of Canada (NSERC); Organisation for Scientific Research (NWO)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1369396

Ciezarek, Gregory, Franco Sevilla, Manuel, Hamilton, Brian, Kowalewski, Robert, Kuhr, Thomas, Lüth, Vera, and Sato, Yutaro. A challenge to lepton universality in B-meson decays. United States: N. p., Web. doi:10.1038/nature22346.
Ciezarek, Gregory, Franco Sevilla, Manuel, Hamilton, Brian, Kowalewski, Robert, Kuhr, Thomas, Lüth, Vera, & Sato, Yutaro. A challenge to lepton universality in B-meson decays. United States. doi:10.1038/nature22346.
Ciezarek, Gregory, Franco Sevilla, Manuel, Hamilton, Brian, Kowalewski, Robert, Kuhr, Thomas, Lüth, Vera, and Sato, Yutaro. 2017. "A challenge to lepton universality in B-meson decays". United States. doi:10.1038/nature22346. https://www.osti.gov/servlets/purl/1369396.
@article{osti_1369396,
title = {A challenge to lepton universality in B-meson decays},
author = {Ciezarek, Gregory and Franco Sevilla, Manuel and Hamilton, Brian and Kowalewski, Robert and Kuhr, Thomas and Lüth, Vera and Sato, Yutaro},
abstractNote = {One of the key assumptions of the standard model of particle physics is that the interactions of the charged leptons, namely electrons, muons and taus, differ only because of their different masses. Whereas precision tests comparing processes involving electrons and muons have not revealed any definite violation of this assumption, recent studies of B-meson decays involving the higher-mass tau lepton have resulted in observations that challenge lepton universality at the level of four standard deviations. Here, a confirmation of these results would point to new particles or interactions, and could have profound implications for our understanding of particle physics.},
doi = {10.1038/nature22346},
journal = {Nature (London)},
number = 7657,
volume = 546,
place = {United States},
year = {2017},
month = {6}
}