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Photoproduction of Neutral ρ Mesons

G. McClellan*, N. Mistry, P. Mostek†, H. Ogren‡, A. Silverman, J. Swartz§, and R. Talman

  • Laboratory of Nuclear Studies, Cornell University, Ithaca, New York 14850

  • *Present address: Department of Physics, University of Maryland, College Park, Maryland 20742.
  • †Present address: Western Electric Company, Engineering Center, P.O. Box 900, Princeton, New Jersey 08540.
  • ‡Present address: Laboratori Nazionali di Frascati, Casella Postale N. 70, 00044 Frascati (Roma), Italy.
  • §Present address: Department of Physics, University of Essex, Wivenhoe Park, Colchester, Essex, England.
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Phys. Rev. D 4, 2683 – Published 1 November, 1971

DOI: https://doi.org/10.1103/PhysRevD.4.2683

Abstract

Results are presented on a series of measurements of ρ-photoproduction from hydrogen, deuterium, and complex nuclei ranging up to lead, at photon energies ranging from 4 to 9 GeV. Detailed dipion mass-spectrum fits are presented, using a Drell-type nonresonant background and its interference with the resonant amplitude, with no other arbitrary backgrounds. For hydrogen and deuterium, the inelastic contributions have been subtracted. The A dependence of the cross sections is analyzed to yield values of γρ24π and σρN at average photon energies of 6.1, 6.5, and 8.8 GeV. The hydrogen-to-deuterium ratios indicate the presence of possible nondiffractive amplitudes at low energies which then decrease with energy.

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References (18)

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  6. Omitted endnote

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Phys. Rev. D 4, 2683– Published 1 November, 1971
  • Received 27 May 1971

© 1971 American Physical Society

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