Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-05-06
Phys.Lett.B668:126-132,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
14 pages, 8 figures; predictions for LHC included
Scientific paper
10.1016/j.physletb.2008.08.022
The forward photoproduction amplitude for gamma p to Upsilon p is calculated in a pQCD k_t-factorization approach with an unintegrated gluon distribution constrained by inclusive deep-inelastic structure functions. The total cross section for diffractive Upsilons is compared with a recent HERA data. We also discuss the 2S/1S ratio in diffractive Upsilon-production. The amplitude is used to predict the cross section for exclusive Upsilon production in hadronic reactions. Differential distributions for the exclusive p pbar to p Upsilon pbar process are calculated for Tevatron energies. We also show predictions for LHC. Absorption effects are included.
Rybarska Anna
Schäfer Wolfgang
Szczurek Antoni
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