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Observation of the decay B-->J/psietaK and search for X(3872)-->J/psieta |
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| Authors: | Aubert B Barate R Boutigny D Couderc F Gaillard J M Hicheur A Karyotakis Y Lees J P Tisserand V Zghiche A Palano A Pompili A Chen J C Qi N D Rong G Wang P Zhu Y S Eigen G Ofte I Stugu B Abrams G S Borgland A W Breon A B Brown D N Button-Shafer J Cahn R N Charles E Day C T Gill M S Gritsan A V Groysman Y Jacobsen R G Kadel R W Kadyk J Kerth L T Kolomensky Yu G Kukartsev G LeClerc C Levi M E Lynch G Mir L M Oddone P J Orimoto T J Pripstein M Roe N A Ronan M T Shelkov V G Telnov A V Wenzel W A Ford K Harrison T J Hawkes C M Morgan S E Watson A T Watson N K Fritsch M Goetzen K Held T Koch H |
| Institution: | Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France. |
| Abstract: | We report the observation of the B meson decay B+/- -->J/psietaK+/- and evidence for the decay B0-->J/psietaK0S, using 90 x 10(6) BB; events collected at the Upsilon(4S) resonance with the BABAR detector at the SLAC PEP-II e+e- asymmetric-energy storage ring. We obtain branching fractions of B(B+/- -->J/psietaK+/-) = 10.8 +/- 2.3(stat) +/- 2.4(syst)] x 10(-5) and B(B0-->J/psietaK0S) = 8.4 +/- 2.6(stat) +/- 2.7(syst)] x 10(-5). We search for the new narrow mass state, the X(3872), recently reported by the Belle Collaboration, in the decay B+/- -->X(3872)K+/-,X(3872)-->J/psieta and determine an upper limit of BB +/- -->X(3872)K+/- -->J/psietaK+/-] < 7.7 x 10(-6) at 90% confidence level. |
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