Transversity studies with a polarized 3He target

TL;DR

This paper reviews the theoretical control of nuclear effects in 3He(e,e'pi)X scattering for neutron studies, introduces a covariant Light-Front nuclear model, and derives relations among Transverse-Momentum Dependent distributions.

Contribution

It presents a novel Poincare9 covariant Light-Front approach for 3He, extending spectral functions and deriving new relations among TMDs.

Findings

Nuclear effects are well-understood within the Impulse Approximation.

A new Light-Front covariant model for 3He is developed.

Three exact relations among leading-twist TMDs are obtained.

Abstract

A realistic study of the SiDIS process 3He(e,e'\pi)X in the Bjorken limit is briefly reviewed, showing that the nuclear effects, present in the extraction of the neutron information, are largely under theoretical control, within an Impulse-Approximation approach. In view of the forthcoming experimental data, we shortly present a novel Poincare' covariant description of the nuclear target, implementing a Light-Front analysis at finite Q^2, within the Bakamijan-Thomas construction of the Poincare' generators. Furthermore, as a by-product of the introduction of a Light-Front spin-dependent spectral function for a J=1/2 system, we straightforwardly extend our analysis to the quark-quark correlator, obtaining three new exact relations between the six leading-twist Transverse-Momentum Dependent distributions.