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

S. Glenn, Youngjoon Kwon, A. L. Lyon, S. Roberts, E. H. Thorndike, C. P. Jessop, K. Lingel, H. Marsiske, M. L. Perl, V. Savinov, D. Ugolini, X. Zhou, T. E. Coan, V. Fadeyev, I. Korolkov, Y. Maravin, I. Narsky, R. Stroynowski, J. Ye, T. WlodekM. Artuso, E. Dambasuren, S. Kopp, G. C. Moneti, R. Mountain, S. Schuh, T. Skwarnicki, S. Stone, A. Titov, G. Viehhauser, J. C. Wang, J. Bartelt, S. E. Csorna, K. W. McLean, S. Marka, Z. Xu, R. Godang, K. Kinoshita, I. C. Lai, P. Pomianowski, S. Schrenk, G. Bonvicini, D. Cinabro, R. Greene, L. P. Perera, G. J. Zhou, S. Chan, G. Eigen, E. Lipeles, J. S. Miller, M. Schmidtler, A. Shapiro, W. M. Sun, J. Urheim, A. J. Weinstein, F. Würthwein, D. E. Jaffe, G. Masek, H. P. Paar, E. M. Potter, S. Prell, V. Sharma, D. M. Asner, J. Gronberg, T. S. Hill, D. J. Lange, R. J. Morrison, H. N. Nelson, T. K. Nelson, D. Roberts, B. H. Behrens, W. T. Ford, A. Gritsan, H. Krieg, Krieg J. Roy, J. G. Smith, J. P. Alexander, R. Baker, C. Bebek, B. E. Berger, K. Berkelman, V. Boisvert, D. G. Cassel, D. S. Crowcroft, M. Dickson, S. Von Dombrowski, P. S. Drell, K. M. Ecklund, R. Ehrlich, A. D. Foland, P. Gaidarev, R. S. Galik, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, P. I. Hopman, J. Kandaswamy

Research output: Contribution to journalArticle

Abstract

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 E c.m. = 10.58 GeV and E c.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 σ ee→Y(3S)γ = (17.8±3.0±1.7) pb and σ ee→Y(2S)γ =(15.5±1.3±1.4) pb at E c.m. = 10.58 GeV, and σ ee→Y(3S)γ =(27.3±5.0±2.6) pb and σ ee→Y(2S)γ =(16.3±1.8±1.5) pb at E c.m. = 10.52 GeV, which we compare with theoretical predictions.

Original languageEnglish
Article number052003
JournalPhysical Review D
Volume59
Issue number5
Publication statusPublished - 1999 Dec 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Glenn, S., Kwon, Y., Lyon, A. L., Roberts, S., Thorndike, E. H., Jessop, C. P., Lingel, K., Marsiske, H., Perl, M. L., Savinov, V., Ugolini, D., Zhou, X., Coan, T. E., Fadeyev, V., Korolkov, I., Maravin, Y., Narsky, I., Stroynowski, R., Ye, J., ... Kandaswamy, J. (1999). Y dipion transitions at energies near the Y(4S). Physical Review D, 59(5), [052003].