First measurement of unpolarized semi-inclusive deep-inelastic scattering cross sections from a 3He target
The unpolarized semi-inclusive deep-inelastic scattering (SIDIS) differential cross sections in 3He(e ,e'π±)X have been measured for the first time in Jefferson Lab experiment E06-010 with a 5.9 GeV e- beam on a 3He gas target. The experiment focuses on the valence quark region, covering a kinematic range 0.12 <xb j<0.45 ,1 <Q2<4 (GeV/ c ) 2,0.45 <zh<0.65 , and 0.05 <Pt<0.55 GeV /c . The extracted SIDIS differential cross sections of π± production are compared with existing phenomenological models while the 3He nucleus approximated as two protons and one neutron in a plane-wave picture, in multidimensional bins. Within the experimental uncertainties, the azimuthal modulations of the cross sections are found to be consistent with zero.