Measurement of Time-Dependent CP-Violating Parameters in B0 -> K0S K0S decays

Details Measurement of Time-Dependent CP-Violating Parameters in B0 -> K0S K0S decays Measurement of Time-Dependent CP-Violating Parameters in B0 -> K0S K0S decays

2007-12-27

arxiv.org/abs/0712.4234v1

Phys.Rev.Lett.100:121601,2008

Physics

High Energy Physics

High Energy Physics - Experiment

5pages, 2figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.100.121601

We report a measurement of the CP-violating parameters in B0->K0S K0S decays based on a data sample of 657 million BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. In this study, one neutral B meson is fully reconstructed in the B0->K0S K0S decay mode, and the flavor of the accompanying B meson is identified by its decay products. The CP-violating parameters are measured from the asymmetry in the distributions of the proper-time interval between the two B decays: S = -0.38 +0.69-0.77(stat) +-0.09(syst) and A = -0.38 +-0.38(stat) +-0.05(syst).

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