Measurement of the direct photon spectrum from the (1S)

S. E. Csorna, M. D. Mestayer, R. S. Panvini, G. B. Word, Xia Yi, A. Bean, G. J. Bobbink, I. Brock, A. Engler, T. Ferguson, R. Kraemer, C. Rippich, R. Sutton, H. Vogel, C. Bebek, K. Berkelman, E. Blucher, D. G. Cassel, T. Copie, R. DesalvoJ. W. Dewire, R. Ehrlich, R. S. Galik, M. G.D. Gilchriese, B. Gittelman, S. W. Gray, A. M. Halling, D. L. Hartill, B. K. Heltsley, S. Holzner, M. Ito, J. Kandaswamy, R. Kowalewski, D. L. Kreinick, Y. Kubota, N. B. Mistry, J. Mueller, E. Nordberg, M. Ogg, D. Peterson, D. Perticone, M. Pisharody, K. Read, D. Riley, A. Silverman, P. C. Stein, S. Stone, A. J. Sadoff, P. Avery, R. Poling

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29 Scopus citations

Abstract

We have observed decays of the '(1S) into hadronic final states containing high-energy photons. These are interpreted as coming from the decay '(1S)'+gluon+gluon. We compare the shape of the observed photon energy spectrum with several theoretical predictions and deduce the value of the strong-coupling constant ±s and the QCD scale parameter MS (MS denotes the modified minimal-subtraction scheme) associated with each prediction.

Original languageEnglish (US)
Pages (from-to)1222-1225
Number of pages4
JournalPhysical review letters
Volume56
Issue number12
DOIs
StatePublished - 1986

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