Evidence for the Suppressed Decay B- -> DK-, D -> K+pi-

Abstract

The suppressed decay chain B- -> DK-, D -> K+pi-, where D indicates a anti-D0 or D0 state, provides important information on the CP-violating angle phi_3. We measure the ratio R_{DK} of the decay rates to the favored mode B- -> DK-, D -> K-pi+ to be R_{DK} = [1.63^{+0.44}_{-0.41}(stat)^{+0.07}_{-0.13}(syst)] x 10^{-2}, which indicates the first evidence of the signal with a significance of 4.1sigma. We also measure the asymmetry A_{DK} between the charge-conjugate decays to be A_{DK} = -0.39^{+0.26}_{-0.28}(stat)^{+0.04}_{-0.03}(syst). The results are based on the full 772 x 10^6 B anti-B pair data sample collected at the Upsilon(4S) resonance with the Belle detector.

6 pages, 2 figures, 2 tables, accepted by Physical Review Letters

References in corpus (9)

• Enhanced CP Violation with $B\to K{D}^0({\overline{D}}^0)$ Modes and Extraction of the CKM Angle gamma
• Determining $\gamma$ using $B^{\pm }\to D{K}^{\pm }$ with multibody D decays
• Improved Methods for Observing CP Violation in B+/- --> K+/- D0 and Measuring the CKM Phase gamma
• Evidence for B0->pi0pi0
• Neutral B Flavor Tagging for the Measurement of Mixing-induced CP Violation at Belle
• Study of B+- --> D_CP K+- and D^*_CP K+- decays
• Observation of the Decay B+ --> K+K-pi+
• Measurement of CP observables in B+- --> D_CP K+- decays and constraints on the CKM angle gamma
• Study of the suppressed B meson decay B^- -> D K^-, D -> K^+ π^-

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