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Lees, J P; Tisserand, V; Schroeder, T; Mattison, T S; McKenna, J A; Kravchenko, E A; Onuchin, A P; Skovpen, Yu I; Todyshev, K Yu; Lankford, A J; Panduro Vazquez, W; Echenard, B; Kim, J; Ongmongkolkul, P; Röhrken, M; Meadows, B T; Pushpawela, B G; Sokoloff, M D; Verderi, M; Bettoni, D; Bozzi, C; Garzia, I; Luppi, E; Santoro, V; Calcaterra, A; Piccolo, M; Zallo, A; Shuve, B J; Lacker, H M; Chen, C; Prell, S; Gritsan, A V; Arnaud, N; Lutz, A M; Coleman, J P; Gabathuler, E; Payne, D J; Bevan, A J; Lafferty, G D; Cowan, R; Robertson, S H; Cremaldi, L; Summers, D J; De Nardo, G; LoSecco, J M; Honscheid, K; Gaz, A; Posocco, M; Simi, G; Simonetto, F; Stroili, R; Bomben, M; Calderini, G; Marchiori, G; Ocariz, J; Biasini, M; Rossi, A; Batignani, G; Bettarini, S; Chrzaszcz, M; Oberhof, B; Faccini, R; Ferrarotto, F; Pilloni, A; Piredda, G; Bünger, C; Grünberg, O; Waldi, R; Adye, T; Emery, S; Dorfan, J; Graham, M T; Innes, W R; Luitz, S; MacFarlane, D B; Ratcliff, B N; Va'vra, J; Wisniewski, W J; Purohit, M V; Wilson, J R; Randle-Conde, A; Bellis, M; Burchat, P R; Ernst, J A; Gorodeisky, R; Guttman, N; Peimer, D R; Soffer, A; Spanier, S M; Ritchie, J L; Schwitters, R F; Izen, J M; Bianchi, F; Gamba, D; Oyanguren, A; Bernlochner, F U; King, G J; Lueck, T; Harrison, P F; Latham, T E
Physical review letters, 2020-Dec-11, Letnik: 125, Številka: 24Journal Article
We report on a precision measurement of the ratio R_{τμ}^{ϒ(3S)}=B(ϒ(3S)→τ^{+}τ^{-})/B(ϒ(3S)→μ^{+}μ^{-}) using data collected with the BABAR detector at the SLAC PEP-II e^{+}e^{-} collider. The measurement is based on a 28 fb^{-1} data sample collected at a center-of-mass energy of 10.355 GeV corresponding to a sample of 122 million ϒ(3S) mesons. The ratio is measured to be R_{τμ}^{ϒ(3S)}=0.966±0.008_{stat}±0.014_{syst} and is in agreement with the standard model prediction of 0.9948 within 2 standard deviations. The uncertainty in R_{τμ}^{ϒ(3S)} is almost an order of magnitude smaller than the only previous measurement.
