PoS - Proceedings of Science
Volume 284 - QCD Evolution 2016 (QCDEV2016) - Monday, May 30, 2016 - Afternoon 1
GPDs and Orbital Angular Momentum
M. Burkardt
Full text: pdf
Pre-published on: February 10, 2017
Published on: March 28, 2017
Generalized Parton Distributions (GPDs) provide information on the distribution of quarks in impact paarmeter space. For transversely polarized nucleons, these impact parameter distributions are transversely distorted and this deviation from axial symmetry leads on average to a net transverse force from the spectators on the active quark in a DIS experiment. %The strength of that force can be related to twist-3 PDFs.
This force when acting along the whole trajectory of the active quark leads to transverse single-spin asymmetries. For a longitudinally polarized nucleon target,
the transverse force implies a torque acting on the quark
Orbital Angular Momentum (OAM). The resulting change in OAM as the quark leaves the target equals the difference between the Jaffe-Manohar and Ji OAMs. In the context of the scalar diquark model we demonstrate that the
effect from that torque contributes at the same order as single-spin asymmetries
DOI: https://doi.org/10.22323/1.284.0006
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