Observation of $B^{\pm} \to ψ(2S) π^{\pm}$ and search for direct CP-violation

Details Observation of $B^{\pm} \to ψ(2S) π^{\pm}$ and search for direct CP-violation Observation of $B^{\pm} \to ψ(2S) π^{\pm}$ and search for direct CP-violation

2008-07-14

arxiv.org/abs/0807.2170v2

Phys.Rev.D78:051104,2008

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 3 figures, submitted to PRD(RC)

Scientific paper

10.1103/PhysRevD.78.051104

We report the first observation of $B^{\pm}\to\psi(2S)\pi^{\pm}$, a Cabibbo- and color-suppressed decay. This analysis is based on $657\times10^{6}$ $B\overline B$ events collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB energy-asymmetric $e^+e^-$ collider. The measured branching fraction is ($2.44 \pm 0.22 \pm 0.20$)$\times 10^{-5}$ and the charge asymmetry is $\mathcal{A}=0.022 \pm 0.085 \pm 0.016$. The ratio of the branching fractions $\mathcal {B}(B^{\pm} \to \psi(2S) \pi^{\pm})$$/ \mathcal {B}(B^{\pm} \to \psi(2S) K^{\pm})$ $ = (3.99 \pm 0.36\pm 0.17)%$ is also determined.

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