Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apru10002z&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Experiment E99-117(Jlab E99-117, J. P. Chen, Z. -E. Meziani, P. Souder,et al. al.); hspace2cm http://hallaweb.jlab.org/physics/experiments/he3/A1n/ in Hall A of the Thomas Jefferson National Accelerator Facility (Jefferson Lab) measured the neutron spin asymmetry A_1^n in the large Bjorken x region. A_1^n is predicted to be 0 by the basic SU(6) quark model. In broken SU(6) constituent quark models and perturbative QCD, A_1^n is predicted to approach 1 as xarrow1, and should be positive for large x (N. Isgur, Phys. Rev.) D59 (1999) 034013.. All present data above x=0.4 have large statistical errors and are consistent with A_1^n<= 0. Experiment E99-117 has the sensitivity to determine if this prediction is valid. To extract A_1^n, longitudinal and transverse spin asymmetries have been measured for inclusive (\overrightarrow^3He(\overrightarrowe,e') ) scattering in the deep-inelastic region. This experiment used a polarized electron beam at JLab with the highest available energy of 5.7 GeV, together with a high-density polarized ( ^3 )He target at Hall A, which provide the highest polarized luminosity of the world. Precise data were obtained at three x values (0.33, 0.47, and 0.61), with reasonably high Q^2 (2.8<= Q^2<= 4.8 GeV^2). Preliminary results of A_1^n will be presented.
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