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The relations between TMDs and PDFs are obtained from the symmetryrequirement: relativistic covariance combined with rotationally symmetricparton motion in the nucleon rest frame. This requirement is applied in thecovariant parton model. Using the usual PDFs as an input, we are obtainingpredictions for some polarized and unpolarized TMDs.

Quark intrinsic motion and the link between TMDs and PDFs in covariant approach