Abstract
We analyze the structure of generalized off-diagonal and transverse-momentum dependent quark-quark and gluon-gluon correlators for a spin-1/2 hadron. Using the light-front formalism, we provide a parametrization in terms of the parton generalized transverse-momentum dependent distributions that emphasizes the multipole structure of the correlator. The results for the quark-quark correlation functions are consistent with an alternative parametrization given in terms of Lorentz covariant structures. The parametrization for the gluon-gluon generalized correlator is presented for the first time and allows one to introduce new correlation functions which can be relevant for phenomenological applications.
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Lorcé, C., Pasquini, B. Structure analysis of the generalized correlator of quark and gluon for a spin-1/2 target. J. High Energ. Phys. 2013, 138 (2013). https://doi.org/10.1007/JHEP09(2013)138
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DOI: https://doi.org/10.1007/JHEP09(2013)138