Studies of the decay B+- ---> D(CP)K+-
Jul, 200210 pages
Published in:
- Phys.Rev.Lett. 90 (2003) 131803
e-Print:
- hep-ex/0207012 [hep-ex]
Report number:
- BELLE-PREPRINT-2002-19,
- KEK-PREPRINT-2002-61,
- DPNU-02-20
Experiments:
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Abstract:
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.Note:
- 10 pages, 2 figures, submitted to Physical Review Letters Report-no: BELLE Preprint 2002-19, KEK Preprint 2002-61, DPNU-02-20
- electron positron: colliding beams
- electron positron: annihilation
- Upsilon(10570): electroproduction
- B: pair production
- B: hadronic decay
- B: branching ratio
- D0: hadronic decay
- amplitude analysis: CP
- CP: violation
- BELLE
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