A confinement model calculation of h_1(x)
  The transverse polarization distribution of quarks $h_1(x)$ is computed in a confinement model, the chiral chromodielectric model. The flavor structure of $h_1$, its $Q^2$ evolution and Soffer's inequality are studied. The Drell--Yan double transverse asymmetry $A_{TT}$ is evaluated and found to be one order of magnitude smaller than the double longitudinal asymmetry. 
V. Barone (Dipartimento di Fisica Teorica and INFN, Torino), T.   Calarco and A. Drago (Dipartimento di Fisica and INFN, Fer...