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Lees, J P; Tisserand, V; Palano, A; Schroeder, T; Cheaib, R; So, R Y; Kravchenko, E A; Onuchin, A P; Skovpen, Yu I; Todyshev, K Yu; Lankford, A J; Panduro Vazquez, W; Echenard, B; Kim, J; Porter, F C; Huard, Z; Meadows, B T; Sokoloff, M D; Sun, L; Bernard, D; Verderi, M; Garzia, I; Luppi, E; Santoro, V; de Sangro, R; Martellotti, S; Piccolo, M; Rotondo, M; Gritsan, A V; Arnaud, N; Lutz, A M; Wormser, G; Wright, D M; Coleman, J P; Sacco, R; Cowan, G; Hafner, A; Schubert, K R; Lafferty, G D; Cenci, R; Jawahery, A; Robertson, S H; Neri, N; Taras, P; De Nardo, G; Jessop, C P; Honscheid, K; Margoni, M; Marchiori, G; Ocariz, J; Biasini, M; Manoni, E; Rossi, A; Bettarini, S; Forti, F; Paoloni, E; Rama, M; Rizzo, G; Zani, L; Anulli, F; Faccini, R; Ferrarotto, F; Ferroni, F; Dittrich, S; Leddig, T; Waldi, R; Vasseur, G; Aston, D; Convery, M R; Field, R C; Fulsom, B G; Graham, M T; Hast, C; Innes, W R; Kim, P; Muller, D R; Neal, H; Sullivan, M K; Randle-Conde, A; Ahmed, H; Bellis, M; Puccio, E M T; Alam, M S; Ernst, J A; Guttman, N; Peimer, D R; Soffer, A; Spanier, S M; Ritchie, J L; Schwitters, R F; Bianchi, F; Filippi, A; Vitale, L; Oyanguren, A; Beaulieu, A; Bernlochner, F U; King, G J; Lueck, T; Harrison, P F; Latham, T E
Physical review letters, 2022-Mar-04, Volume: 128, Issue: 9Journal Article
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 Bϒ(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).
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