Search for Charged Lepton Flavor Violation in Narrow Gamma Decays
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Lees-2010-Search for Charged L.pdf
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Author(s)
Dujmic, Denis
Henderson, Shawn Wesley
Sciolla, Gabriella
Yamamoto, R. K.
Zhao, M.
Cowan, Ray F
Fisher, Peter H
Spitznagel, Michael A
Date Issued
April 2010
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
BABAR Collaboration et al. “Search for Charged Lepton Flavor Violation in Narrow Upsilon Decays.” Physical Review Letters 104.15 (2010): 151802. © 2010 The American Physical Society
Version
Final published version
Abstract
Charged-lepton flavor-violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of 99×10[superscript 6]Υ(2S) decays and 117×10[superscript 6]Υ(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions B(Υ(nS)→e[superscript ±]τ[superscript ∓]) and B(Υ(nS)→μ[superscript ±]τ[superscript ∓]) (n=2,3) at the 10[superscript -6] level and use these results to place lower limits of order 1 TeV on the mass scale of charged-lepton flavor-violating effective operators.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.104.151802
