Year: 2003
Type: article
Abstract: We examine the total cross section of virtual photons on protons, ${\ensuremath{\sigma}}_{{\ensuremath{\gamma}}^{*}p}{(W}^{2}{,Q}^{2}),$ at low $x\ensuremath{\cong}{Q}^{2}{/W}^{2}\ensuremath{\ll}1$ and its connection with ``elastic'' diffractive production ${\ensuremath{\gamma}}_{T,L}^{*}\stackrel{\ensuremath{\rightarrow}}{p}{X}_{T,L}^{J=1}p$ in the two-gluon exchange dynamics for the virtual forward Compton scattering amplitude. Solely based on the generic structure of two-gluon exchange, we establish that the cross section is described by the (imaginary part of the) amplitude for forward scattering of $q\overline{q}$ vector states, $(q\overline{q}{)}_{T,L}^{J=1}\stackrel{\ensuremath{\rightarrow}}{p}(q\overline{q}{)}_{T,L}^{J=1}p.$ The generalized vector dominance picture is accordingly established to only rest on the two-gluon-exchange generic structure. This is explicitly seen by the sum rules that allow one to directly relate the total cross section to the cross section for elastic diffractive forward production, ${\ensuremath{\gamma}}_{T,L}^{*}\stackrel{\ensuremath{\rightarrow}}{p}(q\overline{q}{)}_{T,L}^{J=1}p,$ of vector states.
Authors: Masaaki Kuroda, Dieter Schildknecht
Institutions: Meiji Gakuin University, Ferris University, Bielefeld University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1980518591