Search for Direct CP Violation in B -> K pi Decays

Details Search for Direct CP Violation in B -> K pi Decays Search for Direct CP Violation in B -> K pi Decays

2001-06-27

arxiv.org/abs/hep-ex/0106095v1

Phys.Rev.D64:071101,2001

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to PRD Rapid Communications

Scientific paper

10.1103/PhysRevD.64.071101

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.

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