Measurement of the decay of the Υ(1 S) and Υ(2 S) resonances to muon pairs

M. Kobel, D. Antreasyan, H. W. Bartels, D. Besset, Ch Bieler, J. K. Bienlein, A. Bizetti, E. D. Bloom, I. Brock, K. Brockmüller, R. Cabenda, A. Cartacci, M. Cavalli-Sforza, R. Clare, A. Compagnucci, G. Conforto, S. Cooper, R. Cowan, D. Coyne, A. EnglerK. Fairfield, G. Folger, A. Fridman, J. Gaiser, D. Gelphman, G. Glaser, G. Godfrey, K. Graaf, F. H. Heimlich, F. H. Heinsius, R. Hofstadter, J. Irion, Z. Jakubowski, H. Janssen, K. Karch, S. Keh, T. Kiel, H. Kilian, I. Kirkbride, T. Kloiber, W. Koch, A. C. König, K. Königsmann, R. W. Kraemer, S. Krüger, G. Landi, R. Lee, S. Leffler, R. Lekebusch, T. Lesiak, A. M. Litke, W. Lockman, S. Lowe, B. Lurz, D. Marlow, H. Marsiske, W. Maschmann, P. McBride, F. Messing, W. J. Metzger, H. Meyer, B. Monteleoni, B. Muryn, R. Nernst, B. Niczyporuk, G. Nowak, C. Peck, P. G. Pelfer, B. Pollock, F. C. Porter, D. Prindle, P. Ratoff, M. Reidenbach, B. Renger, C. Rippich, M. Scheer, P. Schmitt, J. Schotanus, J. Schütte, A. Schwarz, D. Sievers, T. Skwarnicki, V. Stock, K. Strauch, U. Strohbusch, J. Tompkins, H. J. Trost, B. van Uitert, R. T. Van de Walle, H. Vogel, A. Voigt, U. Volland, K. Wachs, K. Wacker, W. Walk, H. Wegener, D. A. Williams, P. Zschorsch

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9 Scopus citations

Abstract

Using the Crystal Ball detector at the e+e- storage ring DORIS II, we have measured the branching fraction to muon pairs Bμμ of the Υ(1 S) and Υ(2 S) resonances and for the first time the product of the muonic partial width Γμμ and the branching fraction to electrons Bee for both resonances. We obtain {Mathematical expression} and {Mathematical expression} Inserting the present world average value of Bee(1 S)=(2.52±0.17)%, we determine the muonic partial width of the Υ(1 S) as {Mathematical expression} In addition, we present the first indication of the expected interference between μ-pair production in the continuum and in Υ(1 S) decays.

Original languageEnglish (US)
Pages (from-to)193-205
Number of pages13
JournalZeitschrift für Physik C Particles and Fields
Volume53
Issue number2
DOIs
StatePublished - Jun 1992

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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