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Search for charged lepton flavor violation in narrow [Ypsilon] decays

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 99×106Υ(2S)...

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Main Authors: Lees, Jean-Pierre (Author) , Adametz, Aleksandra (Author) , Marks, Jörg (Author) , Schenk, Sebastian (Author) , Uwer, Ulrich (Author)
Corporate Author: BABAR Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 16 April 2010
In: Physical review letters
Year: 2010, Volume: 104, Issue: 15, Pages: 1-7
ISSN:1079-7114
DOI:10.1103/PhysRevLett.104.151802
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.104.151802
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.104.151802
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Author Notes:J.P. Lees, A. Adametz, J. Marks, S. Schenk, U. Uwer [und 460 weitere Personen] (BABAR Collaboration)

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520 |a 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 99×106Υ(2S) decays and 117×106Υ(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions B(Υ(nS)→e±τ∓) and B(Υ(nS)→μ±τ∓) (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. 
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