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

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).

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

References in corpus (8)

• QCD Factorization in B -> pi K, pi pi Decays and Extraction of Wolfenstein Parameters
• Observation of Large CP Violation in the Neutral B Meson System
• Observation of CP violation in the B^0 meson system
• Charming Penguins Strike Back
• Measurement of Branching Fractions for B->ππ, Kπand KK Decays
• Improving Bounds on Penguin Pollution in B -> pi pi
• Implications of CP Asymmetry Limits for $B\to K\pi$ and $B\to \pi \pi$
• Study of CP-violating asymmetries in B^0 --> pi^+pi^-, K^+pi^- decays

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• Evidence for CP-Violating Asymmetries in B0->pi+pi- Decays and Constraints on the CKM Angle phi2
• Lifetime Differences in Heavy Mesons With Time Independent Measurements
• Indication for Large Rescatterings in Charmless Rare B Decays
• Observing Direct CP Violation in Untagged B-Meson Decays
• Improved Measurement of the Partial-Rate CP Asymmetry in B+ -> K0pi+ and B- -> K0bar pi- Decays
• Constraint on the CKM angle alpha from the experimental measurements of CP violation in B_d^0 --> pi^+ pi^- decay
• Highlights from Five Years at the B Factories