Direct calculation of the triple-pomeron coupling for diffractive deep inelastic scattering and real photoproduction
- Universita de Torino (Italy)
- KFA Juelich (Germany)
The authors present a unified direct evaluation of the triple-pomeron coupling A{sub 3P}(Q{sup 2}) for diffractive real photoproduction (Q{sup 2} = 0) and deep inelastic scattering at large Q{sup 2} in the framework of the dipole approach to the generalized BFKL pomeron. They demonstrate how the reaction mechanism changes from diffraction excitation of the constituent quarks of the photon at Q{sup 2} = 0 to excitation of the octet-octet color dipole state of the virtual photon at large Q{sup 2}. The small phenomenological value of A{sub 3P}(0), which was a mystery, is related to the small nonperturabative correlation radius R{sub c}{approx}0.3 fm for the perturbative gluons. The authors confirm the early expectations of weak Q{sup 2} dependence of the dimensional coupling A{sub 3P}(Q{sup 2}) and predict that it rises by the factor {approximately}1.6 from real photoproduction to deep inelastic scattering. 23 refs., 1 fig.
- OSTI ID:
- 508571
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 108, Issue 4; Other Information: PBD: Oct 1995; TN: Translated from Zhurnal Eksperimental`noi i Teoreticheskoi Fiziki; 108, 1155-1163(Oct 1995)
- Country of Publication:
- United States
- Language:
- English
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