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Title: Spin structure functions: Proton / deuteron measurements in the resonance region

Abstract

The RSS experiment ran in Hall C at Jefferson Lab and measured the proton and deuteron beam-target asymmetries for parallel and perpendicular target fields over a W range from pion threshold to 1.9 GeV at Q{sup 2} {approx} 1.3 GeV{sup 2}. Preliminary results for the proton spin structure functions g{sub 1} and g{sub 2} are presented.

Authors:
;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
887157
Report Number(s):
JLAB-PHY-05-467; DOE/ER/40150-3988
TRN: US0604214
DOE Contract Number:
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: 1st Workshop on Quark-Hadron Duality and the Transition to pQCD, Frascati, Rome, Italy, 6-8 Jun 2005
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; DEUTERONS; DUALITY; PIONS; PROTONS; RESONANCE; SPIN; STRUCTURE FUNCTIONS; TARGETS

Citation Formats

Mark Jones, and RSS Collaboration. Spin structure functions: Proton / deuteron measurements in the resonance region. United States: N. p., 2006. Web.
Mark Jones, & RSS Collaboration. Spin structure functions: Proton / deuteron measurements in the resonance region. United States.
Mark Jones, and RSS Collaboration. Wed . "Spin structure functions: Proton / deuteron measurements in the resonance region". United States. doi:. https://www.osti.gov/servlets/purl/887157.
@article{osti_887157,
title = {Spin structure functions: Proton / deuteron measurements in the resonance region},
author = {Mark Jones and RSS Collaboration},
abstractNote = {The RSS experiment ran in Hall C at Jefferson Lab and measured the proton and deuteron beam-target asymmetries for parallel and perpendicular target fields over a W range from pion threshold to 1.9 GeV at Q{sup 2} {approx} 1.3 GeV{sup 2}. Preliminary results for the proton spin structure functions g{sub 1} and g{sub 2} are presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}

Conference:
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  • The RSS collaboration has measured the spin structure functions of the proton and the deuteron at Jefferson Lab using the Hall C HMS spectrometer, a polarized electron beam and a polarized solid target. The asymmetries A and A were measured in the region of the nucleon resonances (0.82 GeV < W < 1.98 GeV) at an average four momentum transfer of Q2 = 1.3 GeV2. The extracted spin structure functions and their kinematic dependence will make a significant contribution in the study of higher-twist effects and polarized duality tests. A description of the experiment and the latest findings of themore » analysis will be presented.« less
  • We present an overview of the measurements for polarized electron scattering from polarized NH_3, ND_3, and ^3He targets at JLab. All three experimental halls are involved in this program. The data span a range in Q^2 up to about 3.5 GeV^2 and a range in the gamma*N invariant mass W up to 3.5 GeV. The photon absorption function A_1 and the spin structure function g1 for the proton and deuteron have been extracted from data obtained with the CLAS spectrometer. The photon absorption functions, A_1 and A_2, and the spin structure functions g_1 and g_2 for ^3He have been obtainedmore » from Hall A data.« less
  • No abstract prepared.
  • Spin structure functions of the nucleon in the region of large x and small to moderate Q 2 continue to be of high current interest. The first moment of the spin structure function g 1, γ 1, goes through a rapid transition from the photon point (Q 2=0), where it is constrained by the Gerasimov-Drell-Hearn sum rule, to the deep inelastic limit where it is sensitive to the nucleon spin fraction carried by quarks. The interesting behavior in the transition region is dominated by baryon resonance excitations. We concluded an experiment to measure these observables for deuterium as part of the ''EG1'' run group in Jefferson Lab's Hall B. We used a highly polarized electron beam with energies from 1.6 GeV to 5.7 GeV and a cryogenic polarized ND 3 target together with the CEBAF Large Acceptance Spectrometer (CLAS) to accumulate over 11 billion events. In this thesis, we present results for the spin structure function gmore » $$d\atop{1}$$ (x,Q 2), as well as its first moment, γ$$d\atop{1}$$(Q 2) in and above the resonance region over a Q 2 range from 0.05 to 5 Gev 2, based on the data taken with beam energies of 1.6 and 5.7 GeV. We also extract the behavior of A$$d\atop{1}$$(x) at large x. Our data are consistent with the Hyperfine-perturbed quark model calculation which predicts that A$$d\atop{1}$$ (x → 1) → 1. We also see evidence for duality in g$$d\atop{1}$$ (x, Q 2) at Q 2 > GeV 2.« less
  • The study of the nucleon polarized structure functions has matured beyond the inclusive measurements of the past to the investigation of all eight quark distribution functions in the nucleon. Jefferson Lab's Hall C program of polarized structure functions studies started with a measurement of the proton and deuteron spin structure in the resonances at Q2 {approx} 1.3 [GeV/c]2. This work will be extended for the proton to more than 5 [GeV/c]2 for both DIS and the resonances in the upcoming SANE experiment. SANE will use a novel non-magnetic very large solid angle detector, BETA. Semi-inclusive asymmetries will be measured tomore » determine the flavor composition of the nucleon spin in the recently approved Semi-SANE experiment. The 11 GeV energy upgrade will open new opportunities to study other functions, such as the transversity, Collins and Sievers functions, using vertical polarized targets.« less