Study of CP-Violating Asymmetries in B0 -> pi+pi- Decays
High Energy Physics - Experiment
2008-11-26 v2
Abstract
We present a measurement of CP-violating asymmetries in B0 -> pi+pi- decays based on a 41.8 fb-1 data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We fully reconstruct one neutral B meson as a B0 -> pi+pi- CP eigenstate and identify the flavor of the accompanying B meson from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we obtain the CP-violating asymmetry parameters Spipi = -1.21 +0.38/-0.27(stat) +0.16/-0.13(syst) and Apipi = +0.94 +0.25/-0.31(stat) +/- 0.09(syst).
Cite
@article{arxiv.hep-ex/0204002,
title = {Study of CP-Violating Asymmetries in B0 -> pi+pi- Decays},
author = {The Belle Collaboration and K. Abe},
journal= {arXiv preprint arXiv:hep-ex/0204002},
year = {2008}
}
Comments
9 pages, 2 figures, accepted for publication in Physical Review Letters