Transver Momentum and Azimuthal Dependence of semi-inclusive DIS at JLab

The transverse-momentum and azimuthal dependence of semi-inclusive deep inelastic scattering (SIDIS) is sensitive to both the intrinsic momentum distribution of the quarks in nucleons as well as the details of the hadronization process. We report on spin-averaged SIDIS production of both positively and negatively charged pions from both proton and deuteron targets using a 10.6 GeV electron beam at Jefferson Lab. Scattered electrons were detected in the HMS spectrometer, covering a kinematic range of 0.3< x< 0.5 and 22<5 GeV². Pions were detected in the SHMS spectrometer, covering the range 0.3t<0.6 GeV. The multiplicity results were fit with an overall magnitude, Gaussian width in t>², and a distribution in cos(Φ). The P_t widths show a moderate z-dependance and slightly larger values for negative pions than for positive pions. No significant difference is observed between proton and deuteron targets. The azimuthal distributions are very closer to zero, strongly contradicting the dominance of the Cahn twist-2 target mas correction. When folded into global analyses, the 20,000 data points of the present experiment will help pin down the 3D structure of the nucleon.