Role of the Soffer bound in determination of transversity and the tensor charge

Umberto d'Alesio , Carlo Flore (1) , Alexei Prokudin

1 IJCLab - Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

The transversity and the tensor charge of the nucleon, currently under active investigation experimentally and theoretically, are fundamental quantities in hadron physics as well as for our comprehension of the nucleon structure. Some tension between the values of the tensor charge, as computed on the basis of phenomenological extractions and lattice QCD calculations, has been observed. In this letter, by means of an explicit example, we study the role of assumptions, usually adopted in phenomenological parametrizations, and we show that, by relaxing some of them, such a tension could be eased.

Mots clés: transversity function; Soffer bound; tensor charge; QCD; Transversity function; Tensor charge; JLAB-THY-19-3130; charge: tensor; nucleon: charge; transversity; tension; lattice field theory; parametrization; quantum chromodynamics; hadron

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]; Physique des Hautes Energies - Expérience [hep-ex]; Physique des Hautes Energies - Réseau [hep-lat]

Umberto d'Alesio, Carlo Flore, Alexei Prokudin. Role of the Soffer bound in determination of transversity and the tensor charge. Phys.Lett.B, 2020, 803, pp.135347. ⟨10.1016/j.physletb.2020.135347⟩. ⟨hal-02458726⟩