Evidence for $B^0 \to χ_{c1} π^0$ at Belle

Details Evidence for $B^0 \to χ_{c1} π^0$ at Belle Evidence for $B^0 \to χ_{c1} π^0$ at Belle

2008-09-10

arxiv.org/abs/0809.1778v2

Phys.Rev.D78:091104,2008

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 5 figures

Scientific paper

10.1103/PhysRevD.78.091104

We present a measurement of the branching fraction for the Cabibbo- and color-suppressed $B^0 \to \chi_{c1}\pi^0$ decay based on a data sample of $657\times 10^6$ $B\bar B$ events collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We observe a signal of $40\pm9$ events with a significance of $4.7\sigma$ including systematic uncertainties. The measured branching fraction is $\mathcal {B}(B^0 \to \chi_{c1} \pi^0) = (1.12\pm 0.25(\rm {stat.})\pm 0.12({\rm syst.}))\times 10^{-5}$.

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