Photoproduction of Inelastic and Elastic $$J/\psi$$ Vector Mesons

Thesis/Dissertation · Mon Jun 01 04:00:00 EDT 1992

DOI:https://doi.org/10.2172/1425820· OSTI ID:1425820

Stundzia, Audrius Bronius ^[1]

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1. Toronto U.

Results and analysis on the inelastic and elastic photoproduction of $$J /\psi$$ vector mesons by Fermilab experiment E691 are presented. The inelastic, deep inelastic, coherent elastic and incoherent elastic cross sections were measured at ($$E_{\gamma}$$) = 145 GeV. The $$d\sigma / dzdp^2_{\tau}$$} distribution and the photon energy dependence of the cross sections for these production processes were also measured. The deep inelastic $$J /\psi$$ was analyzed in the colour-singlet photon-gluon-fusion model. It was found that the $$d\sigma / dzdp^2_{\tau}$$ distribution and the the rise of the cross section with $$E\gamma$$ are both well described by a relatively soft gluon distribution [xG( x) $$\alpha$$ ($$1 - x )^{ng}$$, where $$n_g$$ = 6.5 ± 1.1 (stat.)$$^{+1.0}_{-0.6}$$(syst.)].

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1425820
• Report Number(s): FERMILAB-THESIS-1992-46; 348156
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS