Spin Structure of the Deuteron--New Results from CLAS

Journal Article · Tue Aug 04 04:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3215652· OSTI ID:21316916

Guler, Nevzat ^[1]

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1. Old Dominion University, Department of Physics, Norfolk, VA (United States)

Double spin asymmetries for the proton and the deuteron have been measured in the EG1B experiment using the CLAS detector at Jefferson Lab. Longitudinally polarized electrons at energies 1.6, 2.5, 4.2 and 5.75 GeV were scattered from longitudinally polarized NH{sub 3} and ND{sub 3} targets. The double spin asymmetry A{sub ||} for the proton and the deuteron has been extracted from these data as a function of W and Q{sup 2} with unprecedented precision. The virtual photon asymmetry A{sub 1} and the spin structure function g{sub 1} can be calculated from these measurements by using parametrization to the world data for the virtual photon asymmetry A{sub 2} and the unpolarized structure functions F{sub 1} and R. The large kinematic coverage of the experiment (0.05 GeV{sup 2}<Q{sup 2}<0.5 GeV{sup 2} and 1.08 GeV<W<3.0 GeV) helps us to better understand the spin structure of the nucleon, especially in the transition region between hadronic and quark-gluon degrees of freedom. The results on A{sub 1}, g{sub 1} and {gamma}{sub 1} using the entire data set for the deuteron data are presented.

• OSTI ID: 21316916
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1149; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
CEBAF ACCELERATOR
DEEP INELASTIC SCATTERING
DEUTERIUM TARGET
DEUTERONS
ELECTRON BEAMS
ELECTRON REACTIONS
FOUR MOMENTUM TRANSFER
GEV RANGE
GLUONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE STRUCTURE
PHOTONS
POLARIZED BEAMS
POLARIZED TARGETS
PROTONS
QUARKS
SPIN
STRUCTURE FUNCTIONS