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, Tomasz 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

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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 1987
Externally publishedYes

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

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