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Nuclear Physics Seminars
Nuclear
Tuesday, March 11, 2003
3:30 PM
Physics Building, Room 204

Prof. Stanly J. Brodsky
[Host: Xiaotong Song]
SLAC
"The Unexpected Effects of FinalState Interactions in QCD"

ABSTRACT:
It is usually assumed that the structure functions measured in deep
inelastic leptonproton scattering are the probability distributions
for finding quarks and gluons in the target nucleon. In fact, gluon
exchange between the fast, outgoing partons and the target spectators,
which is usually assumed to be an irrelevant gauge artifact, affects
the leadingtwist structure functions in a profound way, leading to
diffractive leptoproduction processes, shadowing of nuclear structure
functions, and target spin asymmetries. In particular, finalstate
interactions from gluon exchange leads to singlespin asymmetries in
semiinclusive deep inelastic leptonproton scattering which are not
powerlaw suppressed at large photon virtuality Q^2 at fixed x_{bj}. 



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