Speaker
Summary
At JLab12 is starting a wide program to study the neutron's structure, for
instance by extracting the parton transverse-momentum distributions (TMDs)
through polarized Semi-inclusive deep-inelastic scattering (SIDIS) experiments on $^3$He,
where a high-energy pion (or kaon) is detected in coincidence with the
scattered electron.
This will provide, togheter with proton and deuteron data, a sound
flavor decomposition of the TMDs.
Given the expected high statistical accuracy, it is crucial to disentangle
nuclear and partonic degrees of freedom to get an accurate
theoretical description of both initial and final states.
In a recent paper [1,2], we have carried out a study of a SIDIS process on polarized $^3$He where
a spectator nucleon-pair in a deuteron state is detected.
Within a non-relativistic framework,
we have taken into account the very challenging issue of the final state
interaction, between the observed deuteron and the remnant,
through a distorted spin-dependent spectral function, based on a generalized
eikonal approximation. The $^3$He initial state was taken from the careful
calculation with the AV18 NN interaction performed by the Pisa group. In this
contribution, the extension to the standard
SIDIS, where a pion (or a kaon) is detected, and
the recoiling nucleon-pair can be in any state, will be presented
[2] together with preliminary results illustrating the possibility of a reliable
extraction of the neutron TMDs.
This study will be very useful for the JLab experiments on $^3$He target.
In particular the derived distorted spectral function will be included in the MonteCarlo
tools that will be used for the analysis of the forthcoming data.
[1] L. Kaptari, A. Del Dotto, E. Pace, G. Salm`e and S. Scopetta
''Distorted spin-dependent spectral function of an A=3 nucleus and
semi-inclusive deep-inelastic scattering processes'',
Phys. Rev. {\bf C 89}, (2014) 035206.
[2] Emanuele Pace, Alessio Del Dotto, Leonid Kaptari, Matteo Rinaldi,
Giovanni Salmè, Sergio Scopetta
"Light-Front Dynamics and the 3He Spectral Function"
Few-Body Systems , 57, 601-606 (2016) DOI : 10.1007/s00601-016-1067-3
[3] A. Del Dotto, L. Kaptari, E. Pace, G. Salm`e and S. Scopetta,
'' Final state interactions in deep inelastic meson
electroproduction off transversely polarized $^3$He and the extraction of
neutron single spin asymmetries'', in preparation.
