Search for Charged Lepton Flavor Violation in Narrow {Upsilon} Decays

Journal Article · Fri Apr 16 00:00:00 EDT 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.104.151802· OSTI ID:21410712

Lees, J P; Poireau, V; Prencipe, E; Tisserand, V ^[1]; Garra Tico, J; Grauges, E ^[2]; Martinelli, M; Palano, A; Pappagallo, M ^[3]; Eigen, G; Stugu, B; Sun, L ^[4]; Battaglia, M; Brown, D N; Hooberman, B; Kerth, L T; Kolomensky, Yu G; Lynch, G; Osipenkov, I L; Tanabe, T ^[5]

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1. Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Universite de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. INFN Sezione di Bari, I-70126 Bari (Italy)
4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)

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 99x10{sup 6{Upsilon}}(2S) decays and 117x10{sup 6{Upsilon}}(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions B({Upsilon}(nS){yields}e{sup {+-}{tau}{+-}}) and B({Upsilon}(nS){yields}{mu}{sup {+-}{tau}{+-}}) (n=2,3) at the 10{sup -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.

• OSTI ID: 21410712
• Journal Information: Physical Review Letters, Vol. 104, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.104.151802; (c) 2010 The American Physical Society; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BRANCHING RATIO
FLAVOR MODEL
INVARIANCE PRINCIPLES
LEPTONS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PEP STORAGE RINGS
STANDARD MODEL
SUPERSYMMETRY
TEV RANGE
COMPOSITE MODELS
DECAY
DIMENSIONLESS NUMBERS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FIELD THEORIES
GRAND UNIFIED THEORY
MATHEMATICAL MODELS
PARTICLE MODELS
QUANTUM FIELD THEORY
QUARK MODEL
STORAGE RINGS
SYMMETRY
UNIFIED GAUGE MODELS