Abstract
We study the transverse momentum dependent light-front correlator for gluons. At the operator level this is expressed as a matrix element containing nonlocal field strength operators and gauge links bridging the nonlocality. We parametrize the leading (twist-2) gluon–gluon correlator in terms of transverse momentum dependent distribution functions for unpolarized, vector and tensor polarized targets (the latter being relevant for spin-1 targets). For a tensor polarized target there are eleven functions among which two are time reversal odd. We discuss bounds on some functions which might become useful for future applications.
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Cotogno, S. Parametrization of the Transverse Momentum Dependent Light-Front Correlator for Gluons. Few-Body Syst 58, 92 (2017). https://doi.org/10.1007/s00601-017-1254-x
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DOI: https://doi.org/10.1007/s00601-017-1254-x