He Target in CLAS12

This talk will present an exciting physics program of spin-dependent study using the CLAS12 spectrometer in Hall B at Jefferson Lab. The proposal will use a 10.6 GeV electron beam incident on a novel polarized ³He target to do high precision measurements for both spin-dependent inclusive and semi-inclusive DIS (π^±, K^±) over a large kinematic range: 0.05 < x < 0.7, 1 < Q² < 9 (GeV/c)², 0.2 < z < 0.9 and 0 < P_T < 1.3 GeV/c. The principal scientific goal of this experiment is to extract the flavor dependence of the quark polarization, in particular determining their transverse momentum dependence. High precision 5-D (x, z, P_T, Q², φ_h) data on the neutron, in a kinematic region inaccessible and complementary to the EIC, will constrain present theoretical ideas of the spin structure of the nucleon described by QCD. In combination with measurement on the Deuteron target, this data will also offer an unprecedented opportunity to study the spin-dependent in-medium hadronization process. 

\footnote{JLab Proposal PR12-20-002 was granted C1 conditional approval and a scientific rating of A^-: {\it A Program of Spin-Dependent Electron Scattering from a Polarized 3He Target in CLAS12}, Co-Spokespeople: H.~Avakian, J.~Maxwell, R.~Milner, D.~Nguyen}