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Article Dans Une Revue European Physical Journal C: Particles and Fields Année : 2021

Potential linear and angular momentum in the scalar diquark model

Résumé

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.

Dates et versions

hal-03122278 , version 1 (26-01-2021)

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Citer

David Arturo Amor-Quiroz, Matthias Burkardt, William Focillon, Cédric Lorcé. Potential linear and angular momentum in the scalar diquark model. European Physical Journal C: Particles and Fields, 2021, 81 (7), pp.589. ⟨10.1140/epjc/s10052-021-09345-9⟩. ⟨hal-03122278⟩
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