Observation of Upsilon(2S)-->etaUpsilon(1S) and search for related transitions

We report the first observation of Upsilon(2S)-->etaUpsilon(1S), with a branching fraction B=(2.1(-0.6)+0.7(stat)+/-0.3(syst)) x 10(-4) and a statistical significance 5.3sigma. Data were acquired with the CLEO III detector at the CESR e+e(-) symmetric collider. This is the first process observed...

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Veröffentlicht in:	Physical review letters 2008-11, Vol.101 (19), p.192001-192001
Hauptverfasser:	He, Q, Insler, J, Muramatsu, H, Park, C S, Thorndike, E H, Yang, F, Artuso, M, Blusk, S, Khalil, S, Li, J, Mountain, R, Nisar, S, Randrianarivony, K, Sultana, N, Skwarnicki, T, Stone, S, Wang, J C, Zhang, L M, Bonvicini, G, Cinabro, D, Dubrovin, M, Lincoln, A, Naik, P, Rademacker, J, Asner, D M, Edwards, K W, Reed, J, Briere, R A, Ferguson, T, Tatishvili, G, Vogel, H, Watkins, M E, Rosner, J L, Alexander, J P, Cassel, D G, Duboscq, J E, Ehrlich, R, Fields, L, Galik, R S, Gibbons, L, Gray, R, Gray, S W, Hartill, D L, Heltsley, B K, Hertz, D, Hunt, J M, Kandaswamy, J, Kreinick, D L, Kuznetsov, V E, Ledoux, J, Mahlke-Krüger, H, Mohapatra, D, Onyisi, P U E, Patterson, J R, Peterson, D, Riley, D, Ryd, A, Sadoff, A J, Shi, X, Stroiney, S, Sun, W M, Wilksen, T, Athar, S B, Patel, R, Yelton, J, Rubin, P, Eisenstein, B I, Karliner, I, Mehrabyan, S, Lowrey, N, Selen, M, White, E J, Wiss, J, Mitchell, R E, Shepherd, M R, Besson, D, Pedlar, T K, Xavier, J V, Cronin-Hennessy, D, Gao, K Y, Hietala, J, Kubota, Y, Klein, T, Lang, B W, Poling, R, Scott, A W, Zweber, P, Dobbs, S, Metreveli, Z, Seth, K K, Tomaradze, A, Libby, J, Martin, L, Powell, A, Wilkinson, G, Ecklund, K M, Love, W, Savinov, V, Mendez, H, Ge, J Y
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Sprache:	eng
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Zusammenfassung:	We report the first observation of Upsilon(2S)-->etaUpsilon(1S), with a branching fraction B=(2.1(-0.6)+0.7(stat)+/-0.3(syst)) x 10(-4) and a statistical significance 5.3sigma. Data were acquired with the CLEO III detector at the CESR e+e(-) symmetric collider. This is the first process observed involving a b-quark spin flip. For related transitions, 90% confidence limits in units of 10(-4) are B(Upsilon(2S)-->pi0Upsilon(1S)) < 1.8, B(Upsilon(3S)-->etaUpsilon(1S)) < 1.8, B(Upsilon(3S)-->pi0Upsilon(1S)) < 0.7, and B(Upsilon(3S)-->pi0Upsilon(2S)) < 5.1.
ISSN:	0031-9007