arXiv (Cornell University) · 2001 · 10 citations · 0 references
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Natural SciencesPhysicsNuclear PhysicsParticle PhysicsTheoretical PhysicsCp ViolationFlavor PhysicsHadron SpectroscopyNuclear DecayRadioactive DecayCp AsymmetriesCp Violation In B Meson DecaysCp Violation In DecaysDirect Cp ViolationFlavor IdentificationRare Kaon DecaysStrong Cp ViolationWeak Cp Violation
We search for direct CP violation in flavor specific B -> K pi decays by measuring the rate asymmetry between charge conjugate modes. The search is performed on a data sample of 11.1 million B B bar events recorded on the Upsilon(4S) resonance by the Belle experiment at KEKB. We measure 90% confidence intervals in the partial rate asymmetry A_CP of -0.25 < A_CP(K-/+ pi+/-) < 0.37, -0.40 < A_CP(K-/+ pi^0) < 0.36, and -0.53 < A_CP(K^0 pi-/+) < 0.82. By combining the K-/+ pi+/- and K-/+ pi^0 final states, we conclude that -0.22 < A_CP[K-/+(pi+/- + pi^0)] < 0.25 at the 90% confidence level.