Observation of B^{\pm} \to χ_{c1} π^{\pm} and Search for Direct CP Violation

Details Observation of B^{\pm} \to χ_{c1} π^{\pm} and Search for Direct CP Violation Observation of B^{\pm} \to χ_{c1} π^{\pm} and Search for Direct CP Violation

2006-07-07

arxiv.org/abs/hep-ex/0607008v2

Phys.Rev.D74:051103,2006

Physics

High Energy Physics

High Energy Physics - Experiment

5 Pages, 4 figures, BELLE-CONF-0644 (ICHEP06), Submitted to PRD(RC)

Scientific paper

10.1103/PhysRevD.74.051103

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 $\mathcal {B}(B^{\pm} \to \chi_{c1} \pi^{\pm}) = (2.2\pm 0.4\pm 0.3)\times 10^{-5}$ and $\mathcal{A}_{\pi} = 0.07 \pm 0.18\pm 0.02$, respectively. We also determine the ratio $\mathcal {B}(B^{\pm} \to \chi_{c1} \pi^{\pm})/\mathcal {B}(B^{\pm} \to \chi_{c1} K^{\pm}) = (4.3\pm 0.8\pm 0.3) %$.

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