High energy photoproduction of the p and p' vector mesons

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Bronstein, John Michael

Contributors dc:contributor

• Gormley, M.

• high energy photoproduction
• photoproduction
• phi vector mesons
• broad band beam

Statement dc:rights

• 1977 John Michael Bronstein

Language dc:language

en

Identifier

252671

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/25611