Nucleon Spin Structure Program started in 1991:  proposal to measure g 1 and g 2 on protons and deuterons at SLAC: E143  followed by E155 and E155x at.

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Presentation transcript:

Nucleon Spin Structure Program started in 1991:  proposal to measure g 1 and g 2 on protons and deuterons at SLAC: E143  followed by E155 and E155x at SLAC, and NMC at CERN  all with UVA co-spx. Ten Letters with over 1880 citations. Moved to JLab:  CLAS eg1a and eg1b (2002), eg1-dvcs (2009): g 1  Hall C Resonances Spin S. (2002) and SANE (2009): g 1 and g 2  All with UVA co-spx. Four lett., 265 cites + two lett., 30 cites

Nucleon Spin Structure Period 2010 to April 2013  Analysis of Spin Asymmetries of the Nucleon Expt. - SANE  Double spin proton DIS asymmetries with spin at 180° and 80° electrons detected in non-magnetic telescope BETA, Hall C HMS  Inclusive and e-p coincidence elastic asymmetries for G E /G M  Preliminary results at APS Spring 2012, JLab Users Workshop, SPIN2012, DIS 2013 and other conferences  Three Ph. D. thesis defended: J. Maxwell, UVA; J. Mulholland, UVA; A. Liyanage, Hampton U.  In preparation: H. Kang, Seoul National U., and W. Armstrong, Temple U.

SANE Status and Plans SANE goals  DIS g T p = g 1 + g 2 – shown at conferences  Moments of g 1, g 2, twist-3 matrix element d 2 working on extending x range, low x systematics, optimized binning  Spin Asymmetries A 1, A 2 – shown at conferences, parameterizing W and Q 2 dependence for world data fits  HMS inelastic asymmetries – preliminary results shown at DIS 2013 extend RSS PRL 105 (2010) low x range for B-C sum rule, d 2  elastic form factors – publication in preparation Long paper draft in progress

Deuteron Tensor S. F. b 1 Spin structure beyond ½ h-bar  Deuteron tensor b 1 due to nuclear spin 1 h-bar  could be due to rescattering at small Bjorken x  reproducing HERMES non- zero b 1 (x ~ 0.4) important Measure tensor asymmetry A zz = - (2/3) b 1 /F 1 d  use tensor polarized ND3 target  PR to JLab PAC40 (From E. Long)