First measurement of unpolarized semi-inclusive deep-inelastic scattering cross sections from a He3 target [First measurement of unpolarized SIDIS cross section from a ³He target

Here, 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 < x_bj < 0.45,1 < Q² < 4(GeV/c)²,0.45 < z_h < 0.65, and 0.05 < P_t < 0.55GeV/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.