University of Illinois Urbana-Champaign

High energy photoproduction of the p and p' vector mesons

Bronstein, John Michael

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Description

Title
High energy photoproduction of the p and p' vector mesons
Author(s)
Bronstein, John Michael
Issue Date
1977
Doctoral Committee Chair(s)
Gormley, M.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • high energy photoproduction
  • photoproduction
  • phi vector mesons
  • broad band beam
Language
en
Abstract
In an experiment in the broad band photon beam at Fermilab we observe diffractive production of 21T =and 41T =states from Be, AI. Cu and Pb targets. The 21T=data is dominated by the p(770) and the 41T=is dominated by the p'(1500). We measure the energy dependence of p photoproduction from Be and see no evidence for energy variation of the forward cross section in the range 30 to 160 GeV. The forward cross section is consistent with its average value dT / dt ~= 3.42=0.28 ub/GeV2 over the entire range. We obtain for the p' a mass of 1487+/-20 MeV and a width of 675+/-60 MeV. All quoted errors are statistical. A standard optical model analysis of the A dependence of the p and p' photoproduction yields the following results. [equations] Our results for the photon coupling constants are in good agreement with GVMD and with the e+e -storage ring results. The approximate equality of the p-nucleon and p'-nucleon total cross sections is inconsistent with the diagonal version of GVMD and provides strong motivation for including transitions between different vector mesons in GVMD.
Type of Resource
text
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http://hdl.handle.net/2142/25611
Copyright and License Information
1977 John Michael Bronstein

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