Exclusive photoproduction of Upsilon: from HERA to Tevatron

Understand

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.