Measurement of the Time-Dependent CP-Violating Asymmetry in B0KS0π0γ Decays

Y. Ushiroda et al. (Belle Collaboration)
Phys. Rev. Lett. 94, 231601 – Published 16 June 2005

Abstract

We present a new measurement of CP-violation parameters in B0KS0π0γ decay based on a sample of 275×106 BB¯ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB energy-asymmetric e+e collider. One of the B mesons is fully reconstructed in the B0KS0π0γ decay. The flavor of the accompanying B meson is identified from its decay products. CP-violation parameters are obtained from the asymmetry in the distribution of the proper time intervals between the two B decays. We obtain SKS0π0γ=0.580.38+0.46(stat)±0.11(syst) and AKS0π0γ=+0.03±0.34(stat)±0.11(syst), for the KS0π0 invariant mass covering the full range up to 1.8GeV/c2. We also measure the CP-violation parameters for the case B0K*0(KS0π0)γ and obtain SK*0γ=0.790.50+0.63(stat)±0.10(syst) for AK*0γ fixed at 0.

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  • Received 3 March 2005

DOI:https://doi.org/10.1103/PhysRevLett.94.231601

©2005 American Physical Society

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Vol. 94, Iss. 23 — 17 June 2005

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