Statistical description of the proton spin with a large gluon helicity distribution

Claude Bourrely (1) , Jacques Soffer (2)

1 CPT - Centre de Physique Théorique - UMR 7332
2 Physics Department

The quantum statistical parton distributions approach proposed more than one decade ago is revisited by considering a larger set of recent and accurate Deep Inelastic Scattering (DIS) experimental results. It enables us to improve the description of the data by means of a new determination of the parton distributions. We will see that a large gluon polarization emerges, giving a significant contribution to the proton spin.

Mots clés: Gluon polarization; Proton spin; Statistical distributions; POLARIZED PARTON DISTRIBUTIONS

Domaines: Physique [physics]

Claude Bourrely, Jacques Soffer. Statistical description of the proton spin with a large gluon helicity distribution. Physics Letters B, 2015, 740, pp.168-171. ⟨10.1016/j.physletb.2014.11.044⟩. ⟨hal-01230963⟩