Hard diffraction from parton rescattering in QCD
| Autor: | Rikard Enberg, Stanley J. Brodsky, Paul Hoyer, Gunnar Ingelman |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Quark
gap [rapidity] Nuclear and High Energy Physics Particle physics pair production [jet] Nuclear Theory diffraction FOS: Physical sciences Virtual particle Parton momentum spectrum [parton] 01 natural sciences hard scattering Pomeron High Energy Physics - Phenomenology (hep-ph) inclusive reaction [photon p] 0103 physical sciences inclusive reaction [hadron hadron] ddc:530 interaction [color] Rapidity Nuclear Experiment 010306 general physics Physics Quantum chromodynamics 010308 nuclear & particles physics High Energy Physics::Phenomenology final-state interaction [quark] Deep inelastic scattering High Energy Physics - Phenomenology Color model deep inelastic scattering [electron p] High Energy Physics::Experiment |
| Zdroj: | Physical review / D 71(7), 074020 (2005). doi:10.1103/PhysRevD.71.074020 |
| ISSN: | 1550-2368 1550-7998 |
| DOI: | 10.1103/physrevd.71.074020 |
| Popis: | We analyze the QCD dynamics of diffractive deep inelastic scattering. The presence of a rapidity gap between the target and diffractive system requires that the target remnant emerges in a color singlet state, which we show is made possible by the soft rescattering of the struck quark. This rescattering is described by the path-ordered exponential (Wilson line) in the expression for the parton distribution function of the target. The multiple scattering of the struck parton via instantaneous interactions in the target generates dominantly imaginary diffractive amplitudes, giving rise to an "effective pomeron" exchange. The pomeron is not an intrinsic part of the proton but a dynamical effect of the interaction. This picture also applies to diffraction in hadron-initiated processes. Due to the different color environment the rescattering is different in virtual photon- and hadron-induced processes, explaining the observed non-universality of diffractive parton distributions. This framework provides a theoretical basis for the phenomenologically successful Soft Color Interaction model which includes rescattering effects and thus generates a variety of final states with rapidity gaps. We discuss developments of the SCI model to account for the color coherence features of the underlying subprocesses. 12 pages, 9 figures, REVTeX4. Somewhat expanded and modified version, two new subsections added. To appear in PRD |
| Databáze: | OpenAIRE |
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