Evidence for B+ -> K*0bar K*+

Details Evidence for B+ -> K*0bar K*+ Evidence for B+ -> K*0bar K*+

2009-01-09

arxiv.org/abs/0901.1223v1

Phys.Rev.D79:051102,2009

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 14 postscript figures, submitted to Phys. Rev. D. RC

Scientific paper

10.1103/PhysRevD.79.051102

We present measurements of the branching fraction and fraction of longitudinal polarization for the decay B+ -> K*0bar K*+ with a sample of 467 +/- 5 million BBbar pairs collected with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at the SLAC National Accelerator Laboratory. We obtain the branching fraction Br(B+ -> K*0bar K*+) = (1.2 +/- 0.5 +/- 0.1) x 10^{-6} with a significance of 3.7 standard deviations including systematic uncertainties. We measure the fraction of longitudinal polarization f_L = 0.75+0.16-0.26 +/- 0.03. The first error quoted is statistical and the second is systematic.

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