We argue that the t dependence of the two-gluon form factor of the nucleon should be given by Γ (t)= (1 -t/m2g2)-2 with m2g2≈1 GeV2. We demonstrate that this form provides a good description of the t depen dence of the cross section of the elastic photoproduction of J/ψ mesons between the threshold region of Eγ = 11 GeV (Cornell), Eγ= 19 GeV (SLAC) and Eγ= 100 GeV (Fermilab), including the strong energy dependence of the t slope. It is also well matched with the recent DESY HERA data. The same assumption explains also the t dependence of φ-meson electroproduction near threshold at W=2.3 GeV, Q2 = 1.0 GeV2.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Aug 1 2002|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Physics and Astronomy (miscellaneous)