Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-11-02
Acta Phys.Polon.B36:635-656,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
Presented at the 34th International Symposium on Multiparticle Dynamics (ISMD 2004), Sonoma State University, Rohnert Park, Ca
Scientific paper
It is usually assumed -- following the parton model -- that the leading-twist structure functions measured in deep inelastic lepton-proton scattering are simply the probability distributions for finding quarks and gluons in the target nucleon. In fact, gluon exchange between the outgoing quarks and the target spectators effects the leading-twist structure functions in a profound way, leading to diffractive leptoproduction processes, shadowing and antishadowing of nuclear structure functions, and target spin asymmetries, physics not incorporated in the light-front wavefunctions of the target computed in isolation. In particular, final-state interactions from gluon exchange lead to single-spin asymmetries in semi-inclusive deep inelastic lepton-proton scattering which are not power-law suppressed in the Bjorken limit. The shadowing and antishadowing of nuclear structure functions in the Gribov-Glauber picture is due respectively to the destructive and constructive interference of amplitudes arising from the multiple-scattering of quarks in the nucleus. The effective quark-nucleon scattering amplitude includes Pomeron and Odderon contributions from multi-gluon exchange as well as Reggeon quark-exchange contributions. Part of the anomalous NuTeV result for $\sin^2\theta_W$ could be due to the non-universality of nuclear antishadowing for charged and neutral currents. Detailed measurements of the nuclear dependence of individual quark structure functions are thus needed to establish the distinctive phenomenology of shadowing and antishadowing and to make the NuTeV results definitive. I also discuss diffraction dissociation as a tool for resolving hadron substructure Fock state by Fock state and for producing leading heavy quark systems.
No associations
LandOfFree
Novel QCD Aspects of Hard Diffraction, Antishadowing, and Single-Spin Asymmetries does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Novel QCD Aspects of Hard Diffraction, Antishadowing, and Single-Spin Asymmetries, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Novel QCD Aspects of Hard Diffraction, Antishadowing, and Single-Spin Asymmetries will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-340087