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

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 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.

Authors:
; ; ;  [1]; ;  [2]; ; ;  [3]; ; ;  [4]; ; ; ; ; ; ; ;  [5]
  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)
Publication Date:
OSTI Identifier:
21410712
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 104; Journal Issue: 15; Other Information: DOI: 10.1103/PhysRevLett.104.151802; (c) 2010 The American Physical Society; Journal ID: ISSN 0031-9007
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Lees, J P, Poireau, V, Prencipe, E, Tisserand, V, Garra Tico, J, Grauges, E, Martinelli, M, Palano, A, Pappagallo, M, Dipartimento di Fisica, Universita di Bari, I-70126 Bari, Eigen, G, Stugu, B, Sun, L, Battaglia, M, Brown, D N, Hooberman, B, Kerth, L T, Kolomensky, Yu G, Lynch, G, Osipenkov, I L, and Tanabe, T. Search for Charged Lepton Flavor Violation in Narrow {Upsilon} Decays. United States: N. p., 2010. Web. doi:10.1103/PHYSREVLETT.104.151802.
Lees, J P, Poireau, V, Prencipe, E, Tisserand, V, Garra Tico, J, Grauges, E, Martinelli, M, Palano, A, Pappagallo, M, Dipartimento di Fisica, Universita di Bari, I-70126 Bari, Eigen, G, Stugu, B, Sun, L, Battaglia, M, Brown, D N, Hooberman, B, Kerth, L T, Kolomensky, Yu G, Lynch, G, Osipenkov, I L, & Tanabe, T. Search for Charged Lepton Flavor Violation in Narrow {Upsilon} Decays. United States. https://doi.org/10.1103/PHYSREVLETT.104.151802
Lees, J P, Poireau, V, Prencipe, E, Tisserand, V, Garra Tico, J, Grauges, E, Martinelli, M, Palano, A, Pappagallo, M, Dipartimento di Fisica, Universita di Bari, I-70126 Bari, Eigen, G, Stugu, B, Sun, L, Battaglia, M, Brown, D N, Hooberman, B, Kerth, L T, Kolomensky, Yu G, Lynch, G, Osipenkov, I L, and Tanabe, T. 2010. "Search for Charged Lepton Flavor Violation in Narrow {Upsilon} Decays". United States. https://doi.org/10.1103/PHYSREVLETT.104.151802.
@article{osti_21410712,
title = {Search for Charged Lepton Flavor Violation in Narrow {Upsilon} Decays},
author = {Lees, J P and Poireau, V and Prencipe, E and Tisserand, V and Garra Tico, J and Grauges, E and Martinelli, M and Palano, A and Pappagallo, M and Dipartimento di Fisica, Universita di Bari, I-70126 Bari and Eigen, G and Stugu, B and Sun, L and Battaglia, M and Brown, D N and Hooberman, B and Kerth, L T and Kolomensky, Yu G and Lynch, G and Osipenkov, I L and Tanabe, T},
abstractNote = {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.},
doi = {10.1103/PHYSREVLETT.104.151802},
url = {https://www.osti.gov/biblio/21410712}, journal = {Physical Review Letters},
issn = {0031-9007},
number = 15,
volume = 104,
place = {United States},
year = {Fri Apr 16 00:00:00 EDT 2010},
month = {Fri Apr 16 00:00:00 EDT 2010}
}