Measurement of Time-Dependent CP Asymmetries in B0D(*)±π Decays and Constraints on sin(2β+γ)

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. Lett. 92, 251801 – Published 22 June 2004

Abstract

We present a measurement of CP-violating asymmetries in fully reconstructed B0D(*)±π decays in approximately 88×106 Υ(4S)BB¯ decays collected with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. From a time-dependent maximum-likelihood fit we obtain the following for the CP-violating parameters: a=0.022±0.038(stat)±0.020(syst), a*=0.068±0.038(stat)±0.020(syst), clep=+0.025±0.068(stat)±0.033(syst), and clep*=+0.031±0.070(stat)±0.033(syst). Using other measurements and theoretical assumptions we interpret the results in terms of the angles of the Cabibbo-Kobayashi-Maskawa unitarity triangle, and find |sin(2β+γ)|>0.69 at 68% confidence level. We exclude the hypothesis of no CP violation [sin(2β+γ)=0] at 83% confidence level.

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  • Received 27 August 2003

DOI:https://doi.org/10.1103/PhysRevLett.92.251801

©2004 American Physical Society

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Vol. 92, Iss. 25 — 25 June 2004

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