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Search for charged Lepton flavor violation in narrow gamma decays

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BABAR Collaboration (Including:

Lees, J. P., Poireau, V., Prencipe, E., Tisserand, V., Garra Tico, J., Grauges, E., Martinelli, M., Palano, A., Pappagallo, M., Eigen, G. et al.
). (2010) Search for charged Lepton flavor violation in narrow gamma decays. Physical Review Letters, Vol.104 (No.15). article no. 151802. ISSN 0031-9007

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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.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Journal or Publication Title: Physical Review Letters
Publisher: American Physical Society
ISSN: 0031-9007
Official Date: 16 April 2010
Volume: Vol.104
Number: No.15
Number of Pages: 7
Page Range: article no. 151802
Identification Number: 10.1103/PhysRevLett.104.151802
Status: Peer Reviewed
Publication Status: Published
Funder: DOE, NSF (U.S.A.), NSERC (Canada), CEA, CNRS-IN2P3 (France), BMBF, DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MES (Russia), MEC (Spain), STFC (United Kingdom), European Union, A.P. Sloan Foundation
URI: http://wrap.warwick.ac.uk/id/eprint/6021

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