We discuss a T-even, twist-3 transverse momentum dependent parton distribution for unpolarized proton. We review its general, model-independent and gauge-independent decomposition, which follows from the QCD equations of motion and it is given in terms of a lower-twist distribution, a pure twist-3 distribution and singular terms.
Then we present the results for the twist-3 distribution, using a light-front wave function (LFWF) overlap representation and taking into account
the contribution from the three-quark and the three-quark plus a gluon proton's Fock-states.
Predictions are obtained using a model for the LFWFs, based on the conformal expansion of the proton distribution amplitudes.
The parameters of the LFWFs are fixed to reproduce phenomenological parametrizations of the collinear twist-two unpolarized parton distribution.
Volume 346 -
23rd International Spin Physics Symposium (SPIN2018) -
Parallel Session: Structure of the Nucleon: TMDs (A. Bacchetta, J. Drachenberg and B. Parsamyan)
Quark-gluon correlations in the twist-3 TMD using light-front wave functions.
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Pre-published on:
August 19, 2019
Published on:
August 23, 2019
Abstract
DOI: https://doi.org/10.22323/1.346.0061
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Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
Copyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.