Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-04-27
Phys.Rev.D65:114025,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
35 pages, 8 figures. Discussion of physical consequences of final state interactions amplified. Material on light-cone gauge c
Scientific paper
10.1103/PhysRevD.65.114025
The common view that structure functions measured in deep inelastic lepton scattering are determined by the probability of finding quarks and gluons in the target is not correct in gauge theory. We show that gluon exchange between the fast, outgoing partons and target spectators, which is usually assumed to be an irrelevant gauge artifact, affects the leading twist structure functions in a profound way. This observation removes the apparent contradiction between the projectile (eikonal) and target (parton model) views of diffractive and small x_{Bjorken} phenomena. The diffractive scattering of the fast outgoing quarks on spectators in the target causes shadowing in the DIS cross section. Thus the depletion of the nuclear structure functions is not intrinsic to the wave function of the nucleus, but is a coherent effect arising from the destructive interference of diffractive channels induced by final state interactions. This is consistent with the Glauber-Gribov interpretation of shadowing as a rescattering effect.
Brodsky Stanley J.
Hoyer Paul
Marchal Nils
Peigne Stéphane
Sannino Francesco
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