Measurement of sin2phi_1 at Belle

Abstract

With 6.2 fb^-1 of data collected on the Upsilon(4S), Belle reports its first measurement of sin 2ϕ_1 = 0.45^{+0.43}_{-0.44}(stat)^{+0.07}_{-0.09}(sys). The result was obtained by fitting the proper time distribution of flavor tagged and fully reconstructed neutral B mesons decays to five different charmonia plus a Kshort or Klong channels. In this paper the analysis and results will be described briefly.

arXiv commentFive pages, four figures. This paper is a writeup of a talk given at the DPF2000 Conference held in Columbus Ohio in August 2000. The proceedings will be published in the "Internation Journal of Modern Physics A", by World Scientific