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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 $ep\ensuremath{\rightarrow}eX$ scattering (DIS) and the Drell-Yan process ($pp\ensuremath{\rightarrow}l\overline{l}X$) 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 $\ensuremath{\approx}100\text{ }\text{ }\mathrm{M}\mathrm{e}\mathrm{V}$, 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-${k}_{T}$ approach.
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