pA--Modification of hard scattering

• Assume only one hard parton-parton collision.

• Enhancement of high Pt spectra (Cronin effect )

  • decrease with 1/pt2 and
  • ?A(b) is number of scatteringassume hard sphere distribution
  • ?2 is the soft Kt kick, it has following form

• Modification of nuclear structure function (Shadowing)

  • assume parton distribution:

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