Imaging the Transverse (Spin) Structure of Hadrons |
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Authors: | Matthias Burkardt |
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Institution: | 1. Department of Physics, New Mexico State University, Las Cruces, NM, 88003, USA
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Abstract: | Parton distributions in impact parameter space, which are obtained by Fourier transforming GPDs, exhibit a significant deviation from axial symmetry when the target and/or quark are transversely polarized. Connections between this deformation and transverse single-spin asymmetries as well as with quark–gluon correlations are discussed. The sign of transverse deformation of impact parameter dependent parton distributions in a transversely polarized target can be related to the sign of the contribution from that quark flavor to the nucleon anomalous magnetic moment. Therefore, the signs of the Sivers function for u and d quarks, as well as the signs of quark–gluon correlations embodied in the polarized structure function g 2 can be understood in terms of the proton and neutron anomalous magnetic moments. |
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