Search for B+ --> X(3872) K+, X(3872) --> J/psi gamma

Details Search for B+ --> X(3872) K+, X(3872) --> J/psi gamma Search for B+ --> X(3872) K+, X(3872) --> J/psi gamma

2006-07-25

arxiv.org/abs/hep-ex/0607050v1

Phys.Rev.D74:071101,2006

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 postscript figues, submitted to PRD-RC

Scientific paper

10.1103/PhysRevD.74.071101

In a study of B+ --> J/psi gamma K+ decays, we find evidence for the radiative decay X(3872) --> J/psi gamma with a statistical significance of 3.4 sigma. We measure the product of branching fractions BF(B+ --> X(3872) K+).BF(X(3872) --> J/psi gamma) = (3.3 +/- 1.0 +/- 0.3) x 10^-6, where the uncertainties are statistical and systematic, respectively. We also measure the branching fraction BF(B+ --> chi_c1 K+) = (4.9 +/- 0.2 +/- 0.4) x 10^-4. These results are obtained from (287+/-3) million BBar decays collected at the Y(4S) resonance with the BaBar detector at the PEP-II B Factory at SLAC.

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