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Hard Diffraction from Parton Rescattering in QCD.

DE2004833032

Publication Date	2004
Personal Author	Brodsky, S. J.; Enberg, R.; Hoyer, P.; Ingelman, G.
Page Count	14
Abstract	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.
Keywords	Quantum chromodynamics Rescattering Diffraction Pomeranchuk particles Partons Targets Amplitudes Color Deep inelastic scattering Distribution functions Protons Multiple scattering
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, CA.; Deutsches Elektronen-Synchrotron, Hamburg (Germany, F.R.).; Helsinki Univ. (Finland).; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Helsinki Univ. (Finland). and Deutsches Elektronen-Synchrotron, Hamburg (Germany, F.R.). Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200513

Hard Diffraction from Parton Rescattering in QCD.

Hard Diffraction from Parton Rescattering in QCD.
DE2004833032

Publication Date	2004
Personal Author	Brodsky, S. J.; Enberg, R.; Hoyer, P.; Ingelman, G.
Page Count	14
Abstract	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.
Keywords	Quantum chromodynamics Rescattering Diffraction Pomeranchuk particles Partons Targets Amplitudes Color Deep inelastic scattering Distribution functions Protons Multiple scattering
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Stanford Linear Accelerator Center, CA.; Deutsches Elektronen-Synchrotron, Hamburg (Germany, F.R.).; Helsinki Univ. (Finland).; Department of Energy, Washington, DC.
Supplemental Notes	Prepared in cooperation with Helsinki Univ. (Finland). and Deutsches Elektronen-Synchrotron, Hamburg (Germany, F.R.). Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200513