Experimental upper limits for the hadronic transitions Υ(2 S)→ηΥ(1 S) and Υ(2 S)→π0Υ(1 S)

B. Lurz, D. Antreasyan, D. Besset, J. K. Bienlein, E. D. Bloom, I. Brock, R. Cabenda, A. Cartacci, M. Cavalli-Sforza, R. Clare, G. Conforto, S. Cooper, R. Cowan, D. Coyne, C. Edwards, A. Engler, G. Folger, A. Fridman, J. Gaiser, D. GelphmanG. Godfrey, F. H. Heimlich, R. Hofstadter, J. Irion, Z. Jakubowski, S. Keh, H. Kilian, I. Kirkbride, T. Kloiber, W. Koch, A. C. König, K. Königsmann, R. W. Kraemer, R. Lee, S. Leffler, R. Lekebusch, A. M. Litke, W. Lockman, S. Lowe, D. Marlow, W. Maschmann, T. Matsui, F. Messing, W. J. Metzger, B. Monteleoni, R. Nernst, B. Niczyporuk, G. Nowak, C. Peck, P. G. Pelfer, B. Pollock, F. C. Porter, D. Prindle, P. Ratoff, B. Renger, C. Rippich, M. Scheer, P. Schmitt, J. Schotanus, A. Schwarz, D. Sievers, T. Skwarnicki, K. Strauch, U. Strohbusch, J. Tompkins, H. J. Trost, R. T. Van de Walle, H. Vogel, U. Volland, K. Wacker, W. Walk, H. Wegener, D. Williams, P. Zschorsch

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Using the Crystal Ball detector at the e+e- storage ring DORIS-II, we have searched for the hadronic transitions Υ(2 S)→ηΥ(1 S) and Υ(2 S)→π0Υ(1 S) in exclusive decays where the Υ(1 S) decays into an e+e- or a μ+μ- pair and the η and π0 are detected by their decay modes η→γγ, η→γγ and π0→γγ. From the number of observed events we derive, after consideration of possible background sources, upper limits on the branching ratios B(Υ(2 S)→ηΥ(1 S))<0.7% and B(Υ(2S)→π0Υ(1 S))<0.8% at the 90% confidence level.

Original languageEnglish (US)
Pages (from-to)383-388
Number of pages6
JournalZeitschrift für Physik C Particles and Fields
Volume36
Issue number3
DOIs
StatePublished - Sep 1 1987
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Lurz, B., Antreasyan, D., Besset, D., Bienlein, J. K., Bloom, E. D., Brock, I., Cabenda, R., Cartacci, A., Cavalli-Sforza, M., Clare, R., Conforto, G., Cooper, S., Cowan, R., Coyne, D., Edwards, C., Engler, A., Folger, G., Fridman, A., Gaiser, J., ... Zschorsch, P. (1987). Experimental upper limits for the hadronic transitions Υ(2 S)→ηΥ(1 S) and Υ(2 S)→π0Υ(1 S). Zeitschrift für Physik C Particles and Fields, 36(3), 383-388. https://doi.org/10.1007/BF01573932