Direct calculation of the triple-pomeron coupling for diffractive deep inelastic scattering and real photoproduction (original) (raw)
We present a unied direct evaluation of the triple-pomeron coupling A 3IP (Q 2 ) for diractive 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. We demonstrate how the reaction mechanism changes from diraction excitation of the constituent quarks of the photon at Q 2 = 0 to excitation of the octet-octet colour dipole state of the virtual photon at large Q 2 . The small phenomenological value of A 3IP (0), which w a s a m ystery, is related to the small non perturbative correlation radius R c 0:3 fm for the perturbative gluons. We conrm the early expectations of weak Q 2 dependence of the dimensionful coupling A 3IP (Q 2 ) and predict that it rises by a factor 1:6 from real photoproduction to deep inelastic scattering. *
Sign up for access to the world's latest research.
checkGet notified about relevant papers
checkSave papers to use in your research
checkJoin the discussion with peers
checkTrack your impact
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.