Search for Lepton Flavor Violation in Υ(3<i>S</i>) → e<SUP>±</SUP>μ<SUP>∓</SUP>

Lees, JP, Poireau, V, Tisserand, V, Grauges, E, Palano, A, Eigen, G, Brown, DN, Kolomensky, Yu G, Fritsch, M, Koch, H
et al (show 232 more authors) (2022) Search for Lepton Flavor Violation in Υ(3<i>S</i>) → e<SUP>±</SUP>μ<SUP>∓</SUP>. PHYSICAL REVIEW LETTERS, 128 (9). 091804-.

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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 B[ϒ(3S)→e^{±}μ^{∓}]<3.6×10^{-7} at 90% C. L. This result can be interpreted as a limit Λ_{NP}/g_{NP}^{2}>80  TeV on the energy scale Λ_{NP} divided by the coupling-squared g_{NP}^{2} of relevant new physics (NP).

Item Type: Article
Uncontrolled Keywords: <i>BABAR</i> Collaboration
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 17 May 2022 15:50
Last Modified: 17 Oct 2023 20:25
DOI: 10.1103/PhysRevLett.128.091804
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