Accès ouvert déclaré
2011
article
Evidence for the h b(1P) meson in the decay ?(3S) →π 0h b(1P)
Jp Lees, V Poireau, E Prencipe, V Tisserand, J Garra Tico, E Grauges, M Martinelli, DA Milanes, A Palano, M Pappagallo, G Eigen, B Stugu, L Sun, DN Brown, LT Kerth, YG Kolomensky, G Lynch, I L Osipenkov, H Koch, T Schroeder, Dj Asgeirsson, C Hearty, Ts Mattison, JA McKenna, A Khan, VE Blinov, AR Buzykaev, VP Druzhinin, VB Golubev, EA Kravchenko, AP Onuchin, SI Serednyakov, YI Skovpen, Ep Solodov, KY Todyshev, AN Yushkov, M Bondioli, S Curry, D Kirkby, AJ Lankford, M Mandelkern, Dp Stoker, H Atmacan, JW Gary, F Liu, O Long, G. Vitug, C Campagnari, TM Hong, D Kovalskyi, JD Richman, CA West, AM Eisner, J Kroseberg, WS Lockman, AJ Martinez, T Schalk, BA Schumm, A Seiden, CH Cheng, DA Doll, B Echenard, KT Flood, DG Hitlin, P Ongmongkolkul, FC Porter, AY Rakitin, R Andreassen, MS Dubrovin, BT Meadows, MD Sokoloff, Pc Bloom, WT Ford, A Gaz, M Nagel, U Nauenberg, JG Smith, SR Wagner, R Ayad, WH Toki, H Jasper, A Petzold, B Spaan, MJ Kobel, KR Schubert, R Schwierz, D Bernard, M Verderi, PJ Clark, S Playfer, JE Watson, D Bettoni, C Bozzi, R Calabrese, G Cibinetto, E Fioravanti, I Garzia, E Luppi, M Munerato, M Negrini
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Le résumé fourni par la source
Using a sample of 122×106 Υ(3S) events recorded with the BABAR detector at the PEP-II asymmetric-energy e +e - collider at SLAC, we search for the h b(1P) spin-singlet partner of the P-wave χ bJ(1P) states in the sequential decay Υ(3S) →π0h b(1P), h b(1P) →γη b(1S). We observe an excess of events above background in the distribution of the recoil mass against the π0 at mass 9902±4(stat)±2(syst)MeV/c2. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1σ, including systematic uncertainties. We obtain the value (4.3±1.1(stat) ±0.9(syst))×10 -4 for the product branching fraction B(Υ(3S)→π0h b)×B(h b→γη b). © 2011 American Physical Society.
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Les sujets associés
Quantum Chromodynamics and Particle InteractionsParticle physics theoretical and experimental studiesNeutrino Physics Research