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Title

Search for Charged Lepton Flavor Violation in Narrow Gamma Decays

AuthorsBabar Collaboration; Azzolini, Virginia; López-March, Neus CSIC; Martínez-Vidal, Fernando CSIC ORCID; Milanés, Diego A. CSIC; Oyanguren, Arantza CSIC ORCID; Aubert, B.; Lees, J. P.
Issue Date16-Apr-2010
PublisherAmerican Physical Society
CitationPhysical Review Letters 104 (15): 151802 (2010)
AbstractCharged-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 x 10(6)Gamma(2S) decays and 117 x 10(6)Gamma(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions B(Gamma(nS) --> e(+/-)tau(-/+)) and B(Gamma(n(S) --> mu(+/-)tau(-/+)) (n = 2, 3) at the 10(-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.
Publisher version (URL)http://dx.doi.org/ 10.1103/PhysRevLett.104.151802
URIhttp://hdl.handle.net/10261/24218
DOI10.1103/PhysRevLett.104.151802
ISSN0031-9007
Appears in Collections:(IFIC) Artículos

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