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Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
Phys Rev Lett. 2004 Jul 23;93(4):041801. doi: 10.1103/PhysRevLett.93.041801. Epub 2004 Jul 21.
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 B[B +/- -->X(3872)K+/- -->J/psietaK+/-] < 7.7 x 10(-6) at 90% confidence level.
我们报告了使用在SLAC PEP-II e⁺e⁻非对称能量储存环上的BABAR探测器，在Υ(4S)共振处收集的90×10⁶个BB⁻事件，对B介子衰变B⁺/⁻→J/ψηK⁺/⁻的观测以及对衰变B⁰→J/ψηK⁰S的证据。我们得到B(B⁺/⁻→J/ψηK⁺/⁻) = [10.8±2.3(统计)±2.4(系统)]×10⁻⁵和B(B⁰→J/ψηK⁰S) = [8.4±2.6(统计)±2.7(系统)]×10⁻⁵的分支比。我们在衰变B⁺/⁻→X(3872)K⁺/⁻、X(3872)→J/ψη中寻找最近由Belle合作组报道的新的窄质量态X(3872)，并在90%置信水平下确定B[B⁺/⁻→X(3872)K⁺/⁻→J/ψηK⁺/⁻] < 7.7×10⁻⁶的上限。
