Observation of B->J/psi K1(1270)

Details Observation of B->J/psi K1(1270) Observation of B->J/psi K1(1270)

2001-05-09

arxiv.org/abs/hep-ex/0105014v1

Phys.Rev.Lett.87:161601,2001

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.87.161601

We report the first observation of the exclusive decay process B->J/psi K1(1270) using a sample of 11.2M BBbar meson pairs collected in the Belle detector at the KEKB asymmetric e+e- collider. We measure branching fractions of Bf(B0 -> J/psi K10(1270) = (1.30 +-0.34 +-0.31)x10^-3 and Bf(B+ -> J/psi K1+(1270) = (1.80 +-0.34 +-0.39)x10-3, where the first error is statistical and the second systematic. These modes constitute approximately 15% of the total number of B -> J/psiX decays. No evidence is seen for B -> J/psi K1(1400) and we set an upper limit on this branching fraction. The K1(1270) -> K0pi+pi- decays have a substantial K0rho0 intermediate state component that may be useful for CP violation studies.

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