Direct CP Violating Asymmetry in B0 -> K+pi- Decays
BaBar Collaboration, B. Aubert
Abstract
We present a measurement of the direct CP violating asymmetry in the decay B0 -> K+pi- using 227 x 106 Y(4S) -> BBbar decays collected with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we observe a total signal yield of n(K-pi+) + n(K+pi-) = 1606 +- 51 decays and measure the asymmetry [n(K-pi+)-n(K+pi-)]/[n(K-p+-)+n(K+pi-)] = -0.133+-0.030 (stat) +- 0.009 (syst). The probability of observing such an asymmetry in the absence of direct CP violation is 1.3 x 10-5, corresponding to 4.2 standard deviations.
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