Study of CP-Violating Asymmetries in B0 -> pi+pi- Decays

Details Study of CP-Violating Asymmetries in B0 -> pi+pi- Decays Study of CP-Violating Asymmetries in B0 -> pi+pi- Decays

2002-04-03

arxiv.org/abs/hep-ex/0204002v2

Phys.Rev.Lett.89:071801,2002

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 2 figures, accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.89.071801

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).

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