Measurements of time-dependent CP violation in B^0 -> psi(2S) K_S decays

Details Measurements of time-dependent CP violation in B^0 -> psi(2S) K_S decays Measurements of time-dependent CP violation in B^0 -> psi(2S) K_S decays

2007-08-20

arxiv.org/abs/0708.2604v4

Phys.Rev.D77:091103,2008

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 4 figures, presented at 2007 Lepton-Photon Symposium (BELLE-CONF-0770). Modified version published in PRD(RC)

Scientific paper

10.1103/PhysRevD.77.091103

We report improved measurements of time-dependent CP violation parameters for B^0(\bar{B}^0) -> psi(2S) K_S. This analysis is based on a data sample of 657x10^6 BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e- collider. We fully reconstruct one neutral B meson in the psi(2S) K_S CP-eigenstate decay channel, and the flavor of the accompanying B meson is identified to be either B^0 or \bar{B}^0 from its decay products. CP violation parameters are obtained from the asymmetries in the distributions of the proper-time intervals between the two B decays: S (psi(2S) K_S) = +0.72 +/- 0.09(stat) +/- 0.03(syst), A (psi(2S) K_S) = +0.04 +/- 0.07(stat) +/- 0.05(syst). These results are in agreement with results from measurements of B^0 -> J/psi K^0.

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