Hard Diffractive Processes in QCD and Color-Dipole Nucleon Dynamics at Low-x
スポンサーリンク
概要
- 論文の詳細を見る
We study the hard color dipole-nucleon cross section within perturbative QCD and discuss its relation to observables in diffractive leptoproduction of heavy quarkonimn. The dipole cross section calculated with the unintegrated gluon density of the nucleon substantially differs from the well-known perturbative form σ_<dip>〜b^2 for b > 0.3 fm. where b is the transverse separation of the dipole. We show the measured ratio of ψ' to J/ψ photo-production cross sections constrains the dipole cross section at intermediate b, and in fact excludes the simple σ_<dip>〜b^2 behavior. We also calculate the t-slopes of the diffractive J/ψ,ψ' productions. We emphasize the difference of t-slopes. B_<J/ψ> - B_<ψ'>, is dominated by the dipole-nucleon dynamics. This difference is found to be about 0.3GeV^<-2> with our dipole cross section.
- 2002-01-31