Observation of $Υ(4S) decays to $π^+pi^-Υ(1S)$ and $π^+pi^-Υ(2S)

Details Observation of $Υ(4S) decays to $π^+pi^-Υ(1S)$ and $π^+pi^-Υ(2S) Observation of $Υ(4S) decays to $π^+pi^-Υ(1S)$ and $π^+pi^-Υ(2S)

2006-04-14

arxiv.org/abs/hep-ex/0604031v1

Phys.Rev.Lett.96:232001,2006

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages,, 3 figures,submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.96.232001

We present the first measurement of $\Upsilon(4S)$ decays to $\pi^+pi^-\Upsilon(1S)$ and $\pi^+pi^-\Upsilon(2S)$ based on a sample of 230$\times10^6$ $\Upsilon(4S)$ mesons collected with the BABAR detector. We measure the product branching fractions ${\cal B}(\Upsilon(4S)\to \pi^+pi^-\Upsilon(1S))\times{\cal B}(\Upsilon(1S)\to\mu^+\mu^-)=(2.23\pm0.25_{stat} \pm0.27_{sys})\times 10^{-6}$ and ${\cal B}(\Upsilon(4S)\to \pi^+pi^-\Upsilon(2S))\times{\cal B}(\Upsilon(2S)\to\mu^+\mu^-)=(1.69\pm0.26_{stat}\pm0.20_{sys})\times 10^{-6}$, from which we derive the partial widths $\Gamma(\Upsilon(4S)\to \pi^+pi^-\Upsilon(1S))=(1.8\pm0.4)$~keV and $\Gamma(\Upsilon(4S)\to \pi^+pi^-\Upsilon(2S))=(2.7\pm0.8)$~keV.

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