Studies of the Decay B+- -> D_CP K+-

Details Studies of the Decay B+- -> D_CP K+- Studies of the Decay B+- -> D_CP K+-

2002-07-03

arxiv.org/abs/hep-ex/0207012v1

Phys.Rev.Lett.90:131803,2003

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 2 figures, submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.90.131803

We report studies of the decay B+- -> D_CP K+-, where D_CP denotes neutral D mesons that decay to CP eigenstates. The analysis is based on a 29.1/fb data sample of collected at the \Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric e+ e- storage ring. Ratios of branching fractions of Cabibbo-suppressed to Cabibbo-favored processes involving D_CP are determined to be B(B- -> D_1 K-)/B(B- -> D_1 pi-)=0.125 +- 0.036 +- 0.010 and B(B- -> D_2 K-)/B(B- -> D_2 pi-)=0.119 +- 0.028 +- 0.006, where indices 1 and 2 represent the CP=+1 and CP=-1 eigenstates of the D0 - anti D0 system, respectively. We also extract the partial rate asymmetries for B+- -> D_CP K+-, finding A_1 = 0.29 +- 0.26 +- 0.05 and A_2 = -0.22 +- 0.24 +- 0.04.

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