Measurement of proton polarized structure functions in the energy range from 1.6 to 5.75 GeV using CLAS

Details Measurement of proton polarized structure functions in the energy range from 1.6 to 5.75 GeV using CLAS Measurement of proton polarized structure functions in the energy range from 1.6 to 5.75 GeV using CLAS

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apru10006p&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

Deep inelastic scattering (DIS) using polarized nucleon targets and polarized charged lepton beams allows the extraction of the structure functions g1 and g2 which provide information on the spin structure of the nucleon. A program designed to study such processes has been underway in Jefferson Lab since 1998. A polarized electron beam, solid polarized NH3 and ND3 targets and the Cebaf Large Acceptance Spectrometer (CLAS) in Hall B were used to accumulate 3 billion events with the two beam energies of 2.5 and 4.2 Gev. These first measurements have been greatly enhanced during the second run which was completed in the spring of 2001, and has accumulated over 19 billion events with 4 different beam energies of 1.6, 2.5, 4.2 and 5.7 Gev. The improvements made for the second run and the consequent improvements expected in the quality of the physics analysis will be discussed. Some preliminary results on the measured experimental spin asymmetries at 5.7 Gev will be presented.

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