sin2phi1 with 45 Million BBbar Pairs at Belle
High Energy Physics - Experiment
2007-05-23 v2
Abstract
We present an improved measurement of the standard model CP violation parameter sin2phi1 (also known as sin2beta) based on a sample of 45 x 10^6 BBbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEK asymmetric-energy e^+e^- collider. One neutral B meson is reconstructed in a J/psi Ks, psi(2s) Ks, chi_c1 Ks, eta_c Ks, J/psi K*, or J/psi KL CP-eigenstate decay channel and the flavor of accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain sin2phi1 = 0.82 +/- 0.12(stat) +/- 0.05(syst).
Cite
@article{arxiv.hep-ex/0207075,
title = {sin2phi1 with 45 Million BBbar Pairs at Belle},
author = {Masashi Hazumi},
journal= {arXiv preprint arXiv:hep-ex/0207075},
year = {2007}
}
Comments
8 pages, Talk presented at Flavor Physics and CP Violation (FPCP), Philadelphia, U.S.A., May 16-18, 2002