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Quark Initial State Interaction in Deep Inelastic Scattering and the Drell-Yan process

O. Linnyk·S. Leupold·U. Mosel
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Abstract

We pursue a phenomenological study of higher twist effects in high energy processes by taking into account the off-shellness (virtuality) of partons bound in the nucleon. The effect of parton off-shellness in deep inelastic ep->eX scattering and the Drell-Yan process (pp->l+ l- X) is examined. Assuming factorization and a single-parameter Breit-Wigner form for the parton spectral function, we develop a model to calculate the corresponding off-shell cross sections. Allowing for a finite parton width of the order of 100 MeV, we reproduce the data of both DIS and the triple differential Drell-Yan cross section without an additional K-factor. The results are compared to those from perturbative QCD and the intrinsic-kT approach.

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O. Linnyk, S. Leupold, U. Mosel. 2005-01-27. Quark Initial State Interaction in Deep Inelastic Scattering and the Drell-Yan process. https://doi.org/10.1103/physrevd.71.034009%2010.1103%2Fphysrevd.75.059901

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