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Potential linear and angular momentum in the scalar diquark model

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arxiv 2010.13451 v1 pith:KVB2MIQV submitted 2020-10-26 hep-ph

classification hep-ph
keywords angularmomentumpotentialdiquarklinearmodelscalarcalculation
verification ladder T0 review T1 audit T2 compute T3 formal
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We present an analytic two-loop calculation within the scalar diquark model of the potential linear and angular momenta, defined as the difference between the Jaffe-Manohar and Ji notions of linear and angular momenta. As expected by parity and time-reversal symmetries, a direct calculation confirms that the potential transverse momentum coincides with the Jaffe-Manohar (or canonical) definition of average quark transverse momentum, also known as the quark Sivers shift. We examine whether initial/final-state interactions at the origin of the Sivers asymmetry can also generate a potential angular momentum in the scalar diquark model.

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  1. Gluon contribution to the angular momentum distribution of a dressed quark state

    hep-ph 2024-11 accept novelty 6.0 of 10

    Gluon angular momentum densities in a dressed quark model are computed for canonical, kinetic, and Belinfante decompositions, and the spin sum rule is verified.

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