Two-gluon form factor of the nucleon and $J/\psi$ photoproduction

Abstract

We argue that the t-dependence of the two-gluon form factor of the nucleon should be given by $\Gamma (t)=(1-t/m_{2g}^2{)}^{-2}$ with $m_{2g}^2\approx 1Ge{V}^2$. We demonstrate that this form provides a good description of the t-dependence of the cross section of the elastic photoproduction of $J/\psi$-mesons between the threshold region of $E_{\gamma }=11GeV$ (Cornell), $E_{\gamma }=19GeV$ (SLAC) and $E_{\gamma }=100GeV$ (FNAL) including the strong energy dependence of the t-slope. It is also well matched with the recent HERA data. The same assumption explains also the t-dependence of $\varphi$-meson electroproduction near threshold at $W=2.3GeV,Q^2=1.0Ge{V}^2$.

10 pages, 4 figures

References in corpus (4)

• Hard Exclusive Reactions and the Structure of Hadrons
• Exclusive photoproduction of J/psi mesons at HERA
• Photoproduction of charm near threshold
• Exclusive electroproduction of phi mesons at 4.2 GeV

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