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

Autor: W. Walk, M. Scheer, David R. Williams, B. Monteleoni, B. Niczyporuk, P. Zschorsch, Grzegorz Nowak, T. Kloiber, U. Volland, R. Nernst, D. Coyne, R. Lee, M. Cavalli-Sforza, D. Marlow, Z. Jakubowski, T. Matsui, W. J. Metzger, S. Lowe, T. Skwarnicki, J. Schotanus, K. Strauch, S. Cooper, J. Tompkins, R. Lekebusch, G. Folger, J. K. Bienlein, R. Cabenda, S. Leffler, P. G. Pelfer, K. Königsmann, H. Wegener, H. J. Trost, K. Wacker, P. Schmitt, P. Ratoff, R. W. Kraemer, D. Gelphman, A. M. Litke, U. Strohbusch, J. Gaiser, Elliott D. Bloom, I. C. Brock, J. Irion, W. Lockman, F. Messing, W. Koch, F. C. Porter, A. Engler, H. Kilian, D. Antreasyan, C. W. Peck, G. Conforto, C. Edwards, R. T. Van de Walle, D. Prindle, C. Rippich, Hans J. Vogel, R. Cowan, F. H. Heimlich, B. Lurz, Robert Hofstadter, D. Sievers, B. Pollock, D. Besset, A. M. Cartacci, A. C. König, B. Renger, I. Kirkbride, A. Fridman, G. Godfrey, A. Schwarz, S. Keh, W. Maschmann, R. Clare
Rok vydání: 1987
Předmět:
Zdroj: Zeitschrift für Physik C Particles and Fields. 36:383-388
ISSN: 1434-6052
0170-9739
Popis: Using the Crystal Ball detector at thee +e− storage ring DORIS-II, we have searched for the hadronic transitions Υ(2S)→ηΥ(1S) and Υ(2S)→π0Υ(1S) in exclusive decays where the Υ(1S) decays into ane +e− or aµ + 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 ratiosB(Υ(2S)→ηΥ(1S))
Databáze: OpenAIRE
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