Evidence for CP Violation in B0D+D Decays

S. Fratina et al. (Belle Collaboration)
Phys. Rev. Lett. 98, 221802 – Published 31 May 2007

Abstract

We report measurements of the branching fraction and CP violation parameters in B0D+D decays. The results are based on a data sample that contains 535×106 BB¯ pairs collected at the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e collider. We obtain [1.97±0.20(stat)±0.20(syst)]×104 for the branching fraction of B0D+D. The measured values of the CP violation parameters are S=1.13±0.37±0.09, A=0.91±0.23±0.06, where the first error is statistical and the second is systematic. We find evidence of CP violation in B0D+D at the 4.1σ confidence level. While the value of S is consistent with expectations from other measurements, the value of the parameter A favors large direct CP violation at the 3.2σ confidence level, in contradiction to standard model expectations.

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  • Received 19 February 2007

DOI:https://doi.org/10.1103/PhysRevLett.98.221802

©2007 American Physical Society

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Vol. 98, Iss. 22 — 1 June 2007

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