Precision Spin Structure Functions for the Proton and Deuteron with CLAS

Journal Article · Thu Dec 17 04:00:00 EST 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3293877· OSTI ID:21325699

Biselli, Angela ^[1]

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1. Fairfield University, Fairfield, CT 06828 (United States)

An extensive experimental program to measure the spin structure of the nucleon has been carried out in in Hall B at Jefferson Lab with the CEBAF Large Acceptance Spectrometer (CLAS). Using a longitudinally polarized beam scattering off longitudinally polarized NH{sub 3} and ND{sub 3} targets, the double spin asymmetry A{sub parallel} was measured over a large range in Q{sup 2} and W, providing data of impressive high precision that will give a better understanding of the structure of the nucleon in the Deep Inelastic Scattering and the valence quarks regions. Using a world data parameterization of A{sub 2} and F{sub 1}, the virtual photon asymmetry A{sub 1} and the structure function g{sub 1} were extracted in a Q{sup 2} range from 0.05 to 5 GeV{sup 2} and a W range from 1.08 to 3.0 GeV. As a result of the extended kinematical range, first moments of structure functions were measured over a large range in Q{sup 2} and duality was tested. Finally, using the large kinematical overlap of different beam energies, A{sub 2} was extracted.

• OSTI ID: 21325699
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1182; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMMONIA
ASYMMETRY
CEBAF ACCELERATOR
DEEP INELASTIC SCATTERING
DEUTERIDES
DUALITY
FOUR MOMENTUM TRANSFER
GEV RANGE
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE KINEMATICS
PHOTONS
POLARIZED BEAMS
PROTONS
QUARKS
SPIN
STRUCTURE FUNCTIONS