5 research outputs found
Azimuthal asymmetries in -meson and jet production at the EIC
We study the azimuthal asymmetries in back-to-back leptoproduction of
-meson and jet to probe the gluon TMDs in an unpolarized and transversely
polarized electron-proton collision at the kinematics of EIC. We give
predictions for unpolarized cross-sections within the TMD factorization
framework. In -meson and jet formation, the only leading order contribution
comes from the photon gluon fusion process. We give numerical estimates of the
upper bound on the azimuthal asymmetries with the saturation of positivity
bounds; also, we present the asymmetries using a Gaussian parameterization of
TMDs. We obtain sizable asymmetries in the kinematics that will be accessible
at EIC.Comment: 19 pages, 13 figures, the version to be published in PR
Orbital Angular Momentum Distribution of Gluons at Small- : Analytic interpolation between Ji and Jaffe-Manohar
We introduced a generalized Wilson line gauge link that reproduces both
staple and near straight links in different limits. We then studied the
gauge-invariant bi-local orbital angular momentum operator with such a general
gauge link, in the framework of Chen et. al. decomposition of gauge fields. At
the appropriate combination of limits, the operator reproduces both
Jaffe-Manohar and Ji's operator structure and offers a continuous analytical
interpolation between the two in the small- limit. We also studied the
potential OAM which is defined as the difference between the two, and how it
depends on the geometry or orientation of the gauge links