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Using a data sample collected with the CLEO II detector at CESR, we havesearched for dipion transitions between pairs of $\Upsilon$ resonances atenergies 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 forthe radiative processes $e^+e^- \to \Upsilon(3S)\gamma$ and $e^+e^- \to\Upsilon(2S)\gamma$.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Υ dipion transitions at energies near theΥ(4S)