JLab E07-011: Precision measurements of g{sub 1}{sup d} using ND{sub 3} and LiD

Journal Article · Mon Jul 27 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3203296· OSTI ID:21344403

Bosted, P ^[1]

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1. Jefferson Lab, Newport News, VA 23606 (United States)

We plan to make definitive measurements of the deuteron spin structure function g{sub 1}{sup d}/F{sub 1}{sup d} in the deep-inelastic kinematics accessible with a 6 GeV beam at JLab. The principal goal is to provide the low Q{sup 2} anchor points for NLO pQCD plus higher twist fits to g{sub 1}{sup d}/F{sub 1}{sup d}, which is particularly sensitive to DELTAG(x)(the polarized gluon density of the nucleon) and the sum of up and down quark polarizations. By spanning a factor of typically two in the Q{sup 2}-range at nine values of x, the new data will strongly constrain the higher twist contribution to the fits, with a corresponding reduction in the polarized PDF uncertainties. The proposed measurements, when combined with existing and planned world data at higher Q{sup 2}, will provide the theoretically cleanest determination of DELTAG(x) in the moderate to high x region, and will provide a necessary complement to the low x program of RHIC-spin.The experiment will use both {sup 6}LiD and ND{sub 3} as a source of polarized deuterons, with approximately equal running times for both to constrain the nuclear effects in {sup 6}LiD, the target used by the higher Q{sup 2} experiments at SLAC and CERN. Both the target and low current (nA scale) 6 GeV electron beam will be longitudinally polarized. Electrons scattered at angles from about 18 deg. to 45 deg. will be detected. Additional measurements at lower Q{sup 2} will be made using a 4.8 GeV beam energy.

• OSTI ID: 21344403
• Journal Information: AIP Conference Proceedings, Vol. 1155, Issue 1; Conference: Workshop on spin structure at long distance, Newport News, VA (United States), 2-23 Mar 2009; Other Information: DOI: 10.1063/1.3203296; (c) 2009 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
BROOKHAVEN RHIC
CEBAF ACCELERATOR
D QUARKS
DEEP INELASTIC SCATTERING
DEUTERIDES
DEUTERIUM TARGET
DEUTERONS
ELECTRON REACTIONS
ELECTRON-NUCLEON INTERACTIONS
ELECTRONS
FOUR MOMENTUM TRANSFER
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SPIN
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CHARGED-PARTICLE REACTIONS
DEUTERIUM COMPOUNDS
ELEMENTARY PARTICLES
ENERGY RANGE
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LEPTON-NUCLEON INTERACTIONS
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NATIONAL ORGANIZATIONS
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PARTICLE INTERACTIONS
PARTICLE PROPERTIES
QUANTUM FIELD THEORY
QUARKS
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STORAGE RINGS
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