Study of the Suppressed Decays B^± →[K^∓π^±]_DK^± at Belle

2004/08/25 by Abe, K.
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)

paper · doi:10.48550/arxiv.hep-ex/0408129

Abstract

We report a study of the suppressed decay B^- → [K⁺π^-]_DK^-(and its charge-conjugate mode) at Belle, where [K⁺π^-]_D indicates that the K⁺π^- pair originates from a neutral D meson. A data sample containing 274 million BB pairs recorded at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric e⁺e^- storage ring is used. This decay mode can be used to extract the CKM angle ϕ₃ using the so-called Atwood-Dunietz-Soni method. The signal for B^- → [K⁺π^-]_DK^- has 2.7σ statistical significance, and we set a limit on the ratio of B decay amplitudes r_B < 0.28 at the 90% confidence level. We observe a signal with 5.8σ statistical significance in the related mode, B^- → [K⁺π^-]_Dπ^-.

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