Beam time request for E 12 - 10 - 006 : Target Single Spin Asymmetry in Semi - Inclusive Deep - Inelastic ( e , e ′ π ± ) Reaction on a Transversely Polarized 3 He Target

We propose to carry out precision measurements of Single target Spin Asymmetries (SSA) from semi-inclusive electroproduction of charged pions from a 40-cm long transversely polarized He target in Deep-Inelastic-Scattering kinematics using 11 and 8.8 GeV electron beams. We propose to carry out this coincidence experiment in Hall A with a newly proposed solenoid spectrometer (SoLID) and the standard Hall A polarized He target. The full 2π azimuthal angular coverage on the φS angle and large azimuthal angular coverage on the φh angle are essential in controlling the systematic uncertainties in extracting different asymmetries. The proposed experiment will provide precise 4-D (x, z, PT and Q) data on the Collins, Sivers and Pretzelosity asymmetries for the neutron through the azimuthal angular dependence. The results from this experiment, when combined with the future proton Collins asymmetry measurement and the Collins fragmentation function determined from the e+e− collision data, will allow for a flavor separation of the quark tensor charge, and achieve a determination of the tensor charge of d quark to better than 10%. The extracted Sivers and Pretzelosity asymmetry will provide important information to understand the correlation between the quark orbital angular momentum and the nucleon spin. We request a total of 90 days of beam time (polarized) at incident beam energies of 11 and 8.8 GeV and at a beam current of 15 μA. E12-10-006 collaboration list can be found at http://www.tunl.duke.edu/∼mep/pac38/update/E12 10 006 Collaboration.pdf