Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-08-26
Eur.Phys.J. A19 (2004) S203-S205
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk presented on "IV international conference on Perspectives in Hadronic Physics", to be published in the proceedings, 6 pag
Scientific paper
Non-perturbative corrections to the LO cross section formulae for DIS and the Drell-Yan process were calculated. The interaction of partons was taken into account via dressing the incoming quark lines with spectral functions. We found the effect of ground state correlation in DIS to be large in the region of small Bjorken x and low momentum transfer Q. For a quark width of the order of 200 MeV, the deviation from parton model cross section reaches as much as 50% for Q^2=10 GeV^2. On the other hand, for the values of Q well above the resonance region, the effect of ISI turned out to be small in DIS, but still substantial for the triple differential Drell-Yan cross section. Our calculations show that the shape of the high mass Drell-Yan pair transverse momentum distribution is fully determined by quark off-shellness. From comparison to the resent data on the Drell-Yan cross section from NuSea collaboration, we obtained for the quark width in the nucleon the value about 200 MeV.
Leupold Stefan
Linnyk Olena
Mosel Ulrich
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