Observation of B^{\pm} \to χ_{c1} π^{\pm} and Search for Direct CP Violation
@article{RKumar2006ObservationOB,
title={Observation of B^\{\pm\} \to χ_\{c1\} π^\{\pm\} and Search for Direct CP Violation},
author={The Belle Collaboration R.Kumar and J. Singh and K. Abe and E. al.},
journal={Physical Review D},
year={2006}
}We report the first observation of $B^{\pm} \to \chi_{c1} \pi^{\pm}$, the Cabibbo- and color-suppressed decay in a data sample of $386\times 10^6$~$B\bar B$ events collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We observe $55\pm10$ signal events with a statistical significance of $6.3\sigma$ including systematic uncertainties. The measured branching fraction and charge-asymmetry is $\mathcal {B}(B^{\pm} \to \chi_{c1} \pi^{\pm… CONTINUE READING
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