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Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/24218
Title: Search for Charged Lepton Flavor Violation in Narrow Gamma Decays
Authors: Babar Collaboration; Azzolini, Virginia; López-March, Neus; Martínez-Vidal, Fernando; Milanés, Diego A.; Oyanguren, Arantza; Aubert, B.; Lees, J. P.
Issue Date: 16-Apr-2010
Publisher: American Physical Society
Citation: Physical Review Letters 104 (15): 151802 (2010)
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 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
URI: http://hdl.handle.net/10261/24218
DOI: 10.1103/PhysRevLett.104.151802
ISSN: 0031-9007
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