Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1995-10-26
Nucl.Phys. A597 (1996) 515-542
Physics
Nuclear Physics
Nuclear Theory
44 pages RevTeX, 9 uuencoded figures, accepted for publication in Nucl. Phys. A
Scientific paper
10.1016/0375-9474(95)00434-3
We present a model description of the nucleon valence structure function applicable over the entire region of the Bjorken variable x, and above moderate values of Q**2 (> 1 GeV**2). We stress the importance of describing the complete spectrum of intermediate states which are spectator to the deep-inelastic collision. At a scale of 1 GeV**2 the relevant degrees of freedom are constituent quarks and pions. The large-x region is then described in terms of scattering from constituent quarks in the nucleon, while the dressing of constituent quarks by pions plays an important role at intermediate x values. The correct small-x behavior, which is necessary for the proper normalization of the valence distributions, is guaranteed by modeling the asymptotic spectator mass spectrum according to Regge phenomenology.
Kulagin S. A.
Melnitchouk Wally
Weigl T.
Weise Wolfram
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