Studies of $B^0 \to ρ^\pm π^\mp$ and Evidence of $B^0 \to ρ^0 π^0$

Details Studies of $B^0 \to ρ^\pm π^\mp$ and Evidence of $B^0 \to ρ^0 π^0$ Studies of $B^0 \to ρ^\pm π^\mp$ and Evidence of $B^0 \to ρ^0 π^0$

2003-07-28

arxiv.org/abs/hep-ex/0307077v1

Physics

High Energy Physics

High Energy Physics - Experiment

Submitted to International Europhysics Conference on High Energy Physics, July 2003, Aachen, Germany

Scientific paper

We report studies of $B^0 \to \pi^+ \pi^- \pi^0$, using $78 {\rm fb}^{-1}$ of data collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric $e^+e^-$ storage ring. We measure the branching fraction for $B^0 \to \rho^\pm \pi^\mp$ to be ${\mathcal B}(B^0 \to \rho^\pm \pi^\mp) = (29.1 ^{+5.0}_{-4.9}({\rm stat}) \pm 4.0({\rm syst})) \times 10^{-6}$, and find an untagged charge asymmetry ${\mathcal A} = -0.38^{+0.19}_{-0.21} ({\rm stat}) ^{+0.04}_{-0.05} ({\rm syst})$. We find the first evidence for $B^0 \to \rho^0 \pi^0$ with $3.1\sigma$ statistical significance and with a branching fraction of ${\mathcal B}(B^0 \to \rho^0\pi^0) = (6.0 ^{+2.9}_{-2.3} ({\rm stat}) \pm 1.2 ({\rm syst})) \times 10^{-6}$.

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