IWHSS09, Apr 1 1 Harut Avakian (JLab) Mainz, April 1, 2009 SIDIS results from JLAB IWHSS09, Apr 1 2 Outline Describe the complex nucleon structure in terms of partonic degrees of freedom of QCD Physics motivation Transverse Momentum Distributions (TMDs) of quarks and spin- azimuthal asymmetries in semi-inclusive DIS SIDIS results from JLab at 6 GeV Tests of the applicability of the partonic picture Studies of spin-orbit correlations with CLAS Measurements of TMDs at 6 GeV Longitudinally polarized proton target measurements (E05-113) Transversely polarized 3 He (E06-010/011) and proton targets (E08-015) Summary IWHSS09, Apr 1 3 z sin2 moment of the cross section for unpolarized beam and longitudinal target U unpolarized L long.polarized T trans.polarized SIDIS kinematical plane and observables Transverse spin effects are observable as correlations of transverse spin and transverse momentum of quarks. IWHSS09, Apr 1 4 Structure of the Nucleon GPDs/IPDs d2kTd2kT d2kTd2kT TMD PDFs f 1 u (x,k T ),.. h 1 u (x,k T ) Gauge invariant definition (Belitsky,Ji,Yuan 2003) Universality of k T -dependent PDFs (Collins,Metz 2003) Factorization for small k T. (Ji,Ma,Yuan 2005) W p u (k,r T ) Mother Wigner distributions d2rTd2rT PDFs f 1 u (x),.. h 1 u (x) quark polarization IWHSS09, Apr 1 5 CLAS at JLAB Electron beam energy 6 GeV Lumi ~10 34 cm -2 sec -1 IWHSS09, Apr 1 6 Scattering of 5.7 GeV electrons off unpolarized and polarized proton and deuteron targets SIDIS with CLAS at 6 GeV DIS kinematics, Q 2 >1 GeV 2, W 2 >4 GeV 2, yz>0.7, M X 2 >2 GeV 2 2 eXeX e 1)Polarized NH3/ND3 (~5 days) 2)Polarized H days (2001/2005) IWHSS09, Apr 1 7 multiplicities in SIDIS epe X +/- multiplicities at large z diverge from SIDIS predictions 0 multiplicities less affected by higher twists 0.4