$Υ$ Dipion Transitions at Energies Near the $Υ(4S)$

Details $Υ$ Dipion Transitions at Energies Near the $Υ(4S)$ $Υ$ Dipion Transitions at Energies Near the $Υ(4S)$

1998-08-11

arxiv.org/abs/hep-ex/9808008v1

Phys.Rev.D59:052003,1999

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages, postscript file also available through http://w4.lns.cornell.edu/public/CLNS

Scientific paper

10.1103/PhysRevD.59.052003

Using a data sample collected with the CLEO II detector at CESR, we have searched for dipion transitions between pairs of $\Upsilon$ resonances at energies near the $\Upsilon(4S)$. We obtain upper limits $B(\Upsilon(4S)\to \Upsilon(2S)\pi^+\pi^-) < 3.9 \times 10^{-4}$ and $B(\Upsilon(4S)\to \Upsilon(1S)\pi^+\pi^-) < 1.2 \times 10^{-4}$. We also observe the transitions $\Upsilon(3S)\to \Upsilon(1S)$, $\Upsilon(3S)\to \Upsilon(2S)$, and $\Upsilon(2S)\to \Upsilon(1S)$, from which we measure the cross-sections for the radiative processes $e^+e^- \to \Upsilon(3S)\gamma$ and $e^+e^- \to \Upsilon(2S)\gamma$.

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