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Title: Search for Lepton Flavor Violation in ϒ ( 3 S ) e ± μ

Journal Article · · Physical Review Letters
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We report on the first search for electron-muon lepton flavor violation (LFV) in the decay of a b quark and b antiquark bound state. We look for the LFV decay Υ(3S) → e±μ in a sample of 118 million Υ(3S) mesons from 27 fb-1 of data collected with the BABAR detector at the SLAC PEP-II e+e- collider operating with a 10.36 GeV center-of-mass energy. No evidence for a signal is found, and we set a limit on the branching fraction $$\mathscr{B}$$[Υ(3S) → e±μ ] < 3.6 x 10-7 at 90% C. L. This result can be interpreted as a limit ΛNP/g$$^2_{NP}$$ > 80 TeV on the energy scale ΛNP divided by the coupling-squared g$$^2_{NP}$$ of relevant new physics (NP).

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
BABAR Collaboration; BARBAR Collaboration
Grant/Contract Number:
AC02-76SF00515; AC02-05CH11231
OSTI ID:
1847196
Alternate ID(s):
OSTI ID: 1866834; OSTI ID: 1959788
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Vol. 128 Journal Issue: 9; ISSN 0031-9007
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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