Study of J/psi pi+ pi- states produced in B0 --> J/psi pi+ pi- K0 and B- --> J/psi pi+ pi- K-

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  • 21 July 2005
Abstract
We present results of a search for the X(3872) in B0 --> X(3872) K0_S, X(3872) --> J/\psi pi+ pi-, improved measurements of B- --> X(3872) K-, and a study of the J/psi pi+ pi- mass region above the X(3872). We use 232 million BBbar pairs collected at the Upsilon(4S) resonance with the BaBar detector at the PEP-II e+e- asymmetric-energy storage rings. The results include the 90% confidence interval 1.34 x 10^{-6} < BR(B0 --> X(3872)K0, X --> J/psi pi+ pi-) < 10.3 x 10^{-6} and the branching fraction BR(B- --> X(3872)K-, X --> J/psi pi+ pi-)=(10.1\pm 2.5\pm 1.0) x 10^{-6}. We observe a (2.7\pm 1.3 \pm 0.2) MeV/c^2 mass difference of the X(3872) produced in the two decay modes. Furthermore, we find an excess of J/psi pi+ pi- events with an invariant mass just above 4.2 GeV/c^2 that is consistent with recent observations in initial state radiation events.

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