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Direct photon production at the ψ

D. L. Scharre, M. S. Alam*, A. M. Boyarski, M. Breidenbach, D. L. Burke, J. Dorenbosch, J. M. Dorfan, G. J. Feldman, M. E. B. Franklin et al.

G. S. Abrams, C. A. Blocker, W. C. Carithers, M. W. Coles, S. Cooper, W. E. Dieterle, J. B. Dillon, M. W. Eaton, G. Gidal et al.

G. Hanson, K. G. Hayes, T. Himel†, D. G. Hitlin‡, R. J. Hollebeek, W. R. Innes, J. A. Jaros, P. Jenni†, V. Lüth, M. L. Perl, B. Richter, A. Roussarie, R. H. Schindler†, R. F. Schwitters§, J. L. Siegrist, H. Taureg†, M. Tonutti∥, R. A. Vidal, J. M. Weiss, and H. Zaccone

  • Stanford Linear Accelerator Center, Stanford University, Stanford, California 94305

G. Goldhaber, A. D. Johnson, J. A. Kadyk, A. J. Lankford, R. E. Millikan, M. E. Nelson, C. Y. Pang, J. F. Patrick, J. Strait, G. H. Trilling, E. N. Vella, and I. Videau

  • Lawrence Berkeley Laboratory and Department of Physics, University of California, Berkeley, California 94720

  • *Present address: Vanderbilt University, Nashville, Tennessee 37235.
  • †Present address: CERN, Geneva, Switzerland.
  • ‡Present address: California Institute of Technology, Pasadena, California 91125.
  • §Present address: Harvard University, Cambridge, Massachusetts 02138.
  • ∥Present address: Universität Boon, D-53 Bonn, Federal Republic of Germany.
  • Present address: Centre d'Etudes Nucléaires de Saclay, F-91190 Gif-sur-Yvette, France.
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Phys. Rev. D 23, 43 – Published 1 January, 1981

DOI: https://doi.org/10.1103/PhysRevD.23.43

Abstract

We present results of a detailed analysis of inclusive direct photon production at the ψ(3095). The direct-photon momentum distribution for x>0.4 is presented and compared with the leading-order quantum-chromodynamic prediction. The total production rate is found to be consistent with theoretical expectations, but the observed momentum distribution is considerably softer. Results of an analysis of some inclusive properties of the hadronic system recoiling against the direct photon are presented. The mean charged-particle and Ks multiplicities are presented as functions of the invariant mass of the hadronic system. These data agree well with the corresponding mean multiplicities measured in e+e− annihilations at center-of-mass energies comparable to the invariant mass of the hadronic system.

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Phys. Rev. D 23, 43– Published 1 January, 1981
  • Received 15 July 1980

© 1981 American Physical Society

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