Observation of Upsilon(4S) decays to pi(+)pi(-)Upsilon(1S) and pi(+)pi(-)Upsilon(2S)

Observation of Upsilon(4S) decays to pi(+)pi(-)C and pi(+)pi(-)Upsilon(2S)We present the first measurement of Upsilon(4S) decays to pi(+)pi(-)Upsilon(1S) based on a sample of 230 x 106(4S) mesons collected with the BABAR detector. We measure the product branching fractions Beta(Upsilon(4S) --> pi...

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Veröffentlicht in:	Physical review letters 2006-06, Vol.96 (23), p.232001-232001, Article 232001
Hauptverfasser:	Aubert, B, Barate, R, Bona, M, Boutigny, D, Couderc, F, Karyotakis, Y, Lees, J P, Poireau, V, Tisserand, V, Zghiche, A, Grauges, E, Palano, A, Chen, J C, Qi, N D, Rong, G, Wang, P, Zhu, Y S, Eigen, G, Ofte, I, Stugu, B, Abrams, G S, Battaglia, M, Brown, D N, Button-Shafer, J, Cahn, R N, Charles, E, Gill, M S, Groysman, Y, Jacobsen, R G, Kadyk, J A, Kerth, L T, Kolomensky, Yu G, Kukartsev, G, Lynch, G, Mir, L M, Oddone, P J, Orimoto, T J, Pripstein, M, Roe, N A, Ronan, M T, Wenzel, W A, Barrett, M, Ford, K E, Harrison, T J, Hart, A J, Hawkes, C M, Morgan, S E, Watson, A T, Goetzen, K, Held, T, Koch, H, Lewandowski, B, Pelizaeus, M, Peters, K, Schroeder, T, Steinke, M, Boyd, J T, Burke, J P, Cottingham, W N, Walker, D, Cuhadar-Donszelmann, T, Fulsom, B G, Hearty, C, Knecht, N S, Mattison, T S, McKenna, J A, Khan, A, Kyberd, P, Saleem, M, Teodorescu, L, Blinov, V E, Bukin, A D, Druzhinin, V P, Golubev, V B, Onuchin, A P, Serednyakov, S I, Skovpen, Yu I, Solodov, E P, Todyshev, K Yu, Best, D S, Bondioli, M, Bruinsma, M, Chao, M, Curry, S, Eschrich, I, Kirkby, D, Lankford, A J, Lund, P, Mandelkern, M, Mommsen, R K, Roethel, W, Stoker, D P, Abachi, S, Buchanan, C, Foulkes, S D, Gary, J W, Long, O, Shen, B C, Wang, K, Zhang, L
Format:	Artikel
Sprache:	eng
Schlagworte:	Experiments Física de partícules High Energy Physics - Experiment Particle physics Physics
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Zusammenfassung:	Observation of Upsilon(4S) decays to pi(+)pi(-)C and pi(+)pi(-)Upsilon(2S)We present the first measurement of Upsilon(4S) decays to pi(+)pi(-)Upsilon(1S) based on a sample of 230 x 106(4S) mesons collected with the BABAR detector. We measure the product branching fractions Beta(Upsilon(4S) --> pi(+)pi(-)Upsilon(1S)) x BetaUpsilon(1S) --> mu(+)mu(-) = (2.23 +/- 0.25(stat) +/- 0.27(syst))x 10(-6) and Beta(Upsilon(4S) --> pi(+)pi(-)Upsilon(2S) x Beta(Upsilon(2S) --> mu(+)mu(-))=(1.69 +/-0.26(stat) +/- 0.20(syst)) x 10(-)6, from which we derive the partial widths Gamma(Upsilon(4S) --> pi(+)pi(-)Upsilon(1S))=(1.8 +/-0.4) keV and Gamma(Upsilon(4S) --> pi(+)pi(-)Upsilon(2S))=(2.7 +/- 0.8) keV.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.96.232001