22-26 July 2019
Ecole Nationale Supérieure de Chimie
Europe/Paris timezone

Differences on the Jaffe-Manohar and Ji angular momentum in the scalar diquark model.

22 Jul 2019, 18:45
Amphi Friedel (Ecole Nationale Supérieure de Chimie)

Amphi Friedel

Ecole Nationale Supérieure de Chimie

11 Rue Pierre et Marie Curie, 75005 Paris


Dr David Arturo Amor Quiroz (CPHT, Ecole Polytechnique)


Along with the development of Deep Inelastic Scattering experiments, there has been a growing interest to fully understand the nucleons structure. In particular, there is nowadays a great interest in the decomposition of its total angular momentum into orbital angular momentum (OAM) and intrinsic spin, as well as identifying contributions from valence quarks, sea quarks and gluons.

The most common decompositions of OAM are the Jaffe-Manohar (canonical) and Ji (kinetic) decompositions, which differ in the way contributions are attributed to either quarks or gluons. Using perturbation theory, explicit one-loop calculations have found that the difference between such decompositions vanishes in QED. We show within the scalar diquark model in QED that the discrepancy appears at two-loop level, supporting the interpretation of such inequality as originating from the torque exerted by the spectator system on the struck quark.

Primary authors

Dr David Arturo Amor Quiroz (CPHT, Ecole Polytechnique) Cédric Lorcé (Ecole Politechnique) Matthias Burkardt (Department of Physics, New Mexico State University)

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