Diffractive heavy quarkonium photoproduction and electroproduction in QCD
- School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv (Israel)
- Department of Physics, The Ohio State University, Columbus, Ohio 43210 (United States)
- Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
Hard diffractive photoproduction and electroproduction of heavy vector mesons (J/{psi} and {Upsilon}) is evaluated within the leading {alpha}{sub s}ln(Q{sup 2}/{Lambda}{sub QCD}{sup 2}) approximation of QCD. Different from our earlier work on that subject, also the production of transversely polarized vector mesons is calculated. Special emphasis is placed on the role of the vector meson{close_quote}s q{bar q} light-cone wave function. In that context, conventional nonrelativistic quarkonium models and a light-front QCD bound state calculation are critically examined and confronted with QCD expectations. Our numerical analysis finds a significant high momentum tail in the latter wave functions and a deviation from the expected asymptotic behavior of {phi}{sub V}(z,b=0){proportional_to}z(1{minus}z). We then design an interpolation to match the quarkonium models at large interquark separations with QCD expectations at small distances. We use these results to compare our predictions for the forward differential cross section of J/{psi} photoproduction and electroproduction with recent experimental results from DESY HERA. In addition, our earlier discussion of {rho}{degree} electroproduction is updated in light of recent experimental and theoretical enhancements. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 566151
- Journal Information:
- Physical Review, D, Journal Name: Physical Review, D Journal Issue: 1 Vol. 57; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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