Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-09
PoS LC2010:051,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
invited talk at LC2010, valencia, Spain, June 2010
Scientific paper
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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