Y dipion transitions at energies near the Y(4S)

Y dipion transitions at energies near the Y(4S)

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Using a 4.19 fb-1 data sample collected with the CLEO II detector at the Cornell Electron Storage Ring, we have searched for dipion transitions between pairs of Y resonances at center of mass energies Ec.m. = 10.58 GeV and Ec.m. = 10.52GeV. We obtain the 90% confidence level upper limits B(Y(4S) →Y(...

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Bibliographic Details
Main Authors: Glenn, S, Kwon, Y, Lyon, A, Roberts, S, Thorndike, E, Jessop, C, Lingel, K, Marsiske, H, Perl, M, Savinov, V, Ugolini, D, Zhou, X, Coan, T, Fadeyev, V, Korolkov, I, Maravin, Y, Narsky, I, Stroynowski, R, Ye, J, Wlodek, T, Artuso, M, Dambasuren, E, Kopp, S, Moneti, G, Mountain, R
Format: Journal article
Language:English
Published: 1999
Description
Summary:Using a 4.19 fb-1 data sample collected with the CLEO II detector at the Cornell Electron Storage Ring, we have searched for dipion transitions between pairs of Y resonances at center of mass energies Ec.m. = 10.58 GeV and Ec.m. = 10.52GeV. We obtain the 90% confidence level upper limits B(Y(4S) →Y(2S)π+π-)<3.9×10-4 and B(Y(4S)→Y(1S)π+π-)<1.2×10 -4. We also observe the transitions Y(3S)→Y(1S)π+π-, Y(3S)→Y(2S)π+π-, and Y(2S)→Y(1S)π+π-, from which we measure the cross sections for the radiative processes e+e-→Y(3S)γ and e+e-→Y(2S)γ. We obtain σee→Y(3S)γ = (17.8±3.0±1.7) pb and σee→Y(2S)γ=(15.5±1.3±1.4) pb at Ec.m. = 10.58 GeV, and σee→Y(3S)γ=(27.3±5.0±2.6) pb and σee→Y(2S)γ=(16.3±1.8±1.5) pb at Ec.m. = 10.52 GeV, which we compare with theoretical predictions. ©1999 The American Physical Society.

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