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

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

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 ( 3 S ) → e ± μ ∓ in a sample of 118 million Υ ( 3 S ) mesons from 27     fb − 1 of data collected with the BABAR detector at the SLAC PEP-...

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Hauptverfasser: Grauges, E, Cheaib, R, Hearty, C, Mattison, T.S, Golubev, V.B, Kozyrev, E.A, Kravchenko, E.A, Dey, B, Gary, J.W, Long, O, Eisner, A.M, Lockman, W.S, Chao, D.S, Lin, D.X, Oyang, J, Porter, F.C, Röhrken, M, Huard, Z, Smith, J.G, Bernard, D, Bozzi, C, Calabrese, R, Garzia, I, Luppi, E, Finocchiaro, G, Martellotti, S, Piccolo, M, Rotondo, M, Zallo, A, Patrignani, C, Cochran, J, Prell, S, Gritsan, A.V, Arnaud, N, Wormser, G, Hutchcroft, D.E, Payne, D.J, Touramanis, C, Denig, A.G, Gradl, W, Griessinger, K, Schubert, K.R, Barlow, R.J, Cenci, R, Roberts, D.A, Robertson, S.H, Summers, D.J, Taras, P, Jessop, C.P, Honscheid, K, Kass, R, Gaz, A, Posocco, M, Simonetto, F, Akar, S, Ben-Haim, E, Calderini, G, Marchiori, G, Biasini, M, Manoni, E, Carpinelli, M, Giorgi, M.A, Oberhof, B, Zani, L, Smith, A.J.S, Anulli, F, Pilloni, A, Piredda, G, Bünger, C, Dittrich, S, Grünberg, O, Emery, S, Dorfan, J, Field, R.C, Hast, C, Macfarlane, D.B, Muller, D.R, Neal, H, Roodman, A, Sullivan, M.K, Wilson, J.R, Randle-Conde, A, Ahmed, H, Alam, M.S, Spanier, S.M, Schwitters, R.F, Izen, J.M, Lou, X.C, Bianchi, F, Filippi, A, Lanceri, L, Vitale, L, Martinez-Vidal, F, Oyanguren, A, Albert, J, Beaulieu, A, King, G.J, Kowalewski, R, Nugent, I.M, Wu, S.L
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Zusammenfassung: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 ( 3 S ) → e ± μ ∓ in a sample of 118 million Υ ( 3 S ) 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 ( 3 S ) → e ± μ ∓ ] < 3.6 × 10 − 7 at 90% C. L. This result can be interpreted as a limit Λ NP / g 2 NP > 80     TeV on the energy scale Λ NP divided by the coupling-squared g 2 NP of relevant new physics (NP).