Measurement of Branching Fractions for $B\to {\eta }_c{K}^{(\ast )}$ Decays

Abstract

We report measurements of branching fractions for charged and neutral $B\to {\eta }_{c}K$ decays where the ${\eta }_c$ meson is reconstructed in the $K_S^0{K}^{\pm }{\pi }^{\mp },K^{+}{K}^{-}{\pi }^0,K^{\ast 0}{K}^{-}{\pi }^{+}$ and $p\bar{p}$ decay channels. The neutral $B^0$ channel is a CP eigenstate and can be used to measure the CP violation parameter $\sin 2{\varphi }_1$. We also report the first observation of the $B^0\to {\eta }_c{K}^{\ast 0}$ mode. The results are based on an analysis of 29.1 fb${}^{-1}$ of data collected by the Belle detector at KEKB.

arXiv commentTo appear in Physical Review Letters

References in corpus (8)

• A Unified Approach to the Classical Statistical Analysis of Small Signals
• Observation of Large CP Violation in the Neutral B Meson System
• A Measurement of the Branching Fraction for the Inclusive B --> X(s) gamma Decays with the Belle Detector
• Improved Measurement of Mixing-induced CP Violation in the Neutral B Meson System
• Measurement of Branching Fractions for B->ππ, Kπand KK Decays
• Study of B Decays to Charmonium States $B\to {\eta }_{c}K$ and $B\to {\chi }_{C0}K$
• Exclusive and Semi-Inclusive B Decays Based on \hspace{0.3cm} b $\to$ s \hspace{0.01cm}${\eta }_c$ \hspace{0.3cm} Transition
• Factorization and SU(2) Heavy Flavor Symmetry for B-Meson Decays Producing Charmonium

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