Direct calculation of the triplepomeron coupling for diffractive deep inelastic scattering and real photoproduction
Abstract
We present a unified direct calculation of the triplepomeron coupling $A_{3\Pom}(Q^{2})$ for diffractive real photoproduction ($Q^{2}=0$) and deep inelastic scattering at large $Q^{2}$ in the framework of the dipole approach to the generalized BFKL pomeron. The small phenomenological value of $A_{3\Pom}(0)\approx 0.16$\,GeV$^{2}$, which was a mystery, is related to the small correlation radius $R_{c}\approx 0.3$\,fm for the perturbative gluons. We confirm the early expectations of weak $Q^{2}$ dependence of the dimensionfull coupling $A_{3\Pom}(Q^{2})$ and predict that it rises by the factor $\sim 1.6$ from real photoproduction to deep inelastic scattering.
 Publication:

Soviet Journal of Experimental and Theoretical Physics
 Pub Date:
 October 1995
 arXiv:
 arXiv:hepph/9410272
 Bibcode:
 1995JETP...81..633G
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 14 pages, 1 figure (request from kph154@zam001.zam.kfajuelich.de), Juelich preprint KFAIKP(Th)199436