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Title: The resonance spin structure measurement at Hall-C and the future JLab physics program.

Abstract

We discuss the preliminary results of the Resonant Spin Structure experiment and outline a future spin-dependent measurement in JLab's experimental Hall C.

Authors:
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
919481
Report Number(s):
JLAB-PHY-07-739; DOE/OR/23177-0205
TRN: US0806375
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Conference: DIS 2006, 20-24 Apr 2006, Tsukuba, Japan
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CEBAF ACCELERATOR; ACCELERATOR FACILITIES; EXPERIMENT PLANNING; RESONANCE; SPIN; DATA

Citation Formats

S. Tajma. The resonance spin structure measurement at Hall-C and the future JLab physics program.. United States: N. p., 2007. Web.
S. Tajma. The resonance spin structure measurement at Hall-C and the future JLab physics program.. United States.
S. Tajma. Mon . "The resonance spin structure measurement at Hall-C and the future JLab physics program.". United States. doi:. https://www.osti.gov/servlets/purl/919481.
@article{osti_919481,
title = {The resonance spin structure measurement at Hall-C and the future JLab physics program.},
author = {S. Tajma},
abstractNote = {We discuss the preliminary results of the Resonant Spin Structure experiment and outline a future spin-dependent measurement in JLab's experimental Hall C.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}

Conference:
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  • Encouraged by the success of the first hypernuclear spectroscopy through the (e,e'K+) reaction (JLab E89-009), a new improved experiment with a newly developed High resolution Kaon Spectrometer (HKS) and a new configuration of the electron spectrometer is planned at the JLab Hall C. The introduction of the HKS will improve by a factor of two, the energy resolution which was limited by the previous kaon spectrometer. The hypernuclear yield and the signal to noise ratio will be also improved by a factor of 50 and 10, respectively.
  • The nucleon spin structure has been studied at Jefferson Lab’s Hall C in experiments RSS (E01-006) and SANE (E07-003), which measured double spin asymmetries using the U. of Virginia solid polarized target and CEBAF’s 6 GeV polarized electrons. The proton longitudinal spin structure g 1 and transverse structure g 2 have been investigated at kinematics extending from the elastic point to DIS, for four-momenta squared ranging from 0.8 to 5 GeV2. The neutron structures have been measured in the region of the nucleon resonances at 1.3 GeV2 on a deuteron target. Results of both experiments will be highlighted. A briefmore » survey of approved experiments for the 12 GeV program will also be presented.« less
  • GlueX is one of the flagship experiments of the 12 GeV era at the Thomas Jefferson National Accelerator Facility (JLab). The energy of the electron accelerator at JLab is presently undergoing an upgrade from 6 GeV to 12 GeV and a 4th experimental hall (Hall D) is being added. The GlueX experimental apparatus consists of a tagged coherent bremsstrahlung photon beam incident on a liquid hydrogen target. The photoproduced mesons, which are created inside of a 2.2 T solenoid, will then pass through a pair of drift chambers and eventually deposit their energy into either of two calorimeters, depending onmore » their respective angles. GlueX will attempt to map out the light meson spectrum and search for meson-gluon hybrids to better understand the confinement of quarks and gluons in quantum chromodynamics (QCD). There is little data on the photoproduction of light mesons and the GlueX experiment will exceed the current photoproduction data by several orders of magnitude in the first year alone. Photoproduction is specifically well suited to search for meson-gluon hybrids because in the flux tube model the production cross-sections are higher for meson-gluon hybrids from photons, with the spins of the virtual quark-antiquark pair aligned, than from other sources such as pions, with the spins of the quark-antiquark pair anti-aligned. There are also other Hall D experiments proposed to look for physics beyond the Standard Model by studying Eta rare or forbidden decay channels such as eta to two neutral pions. The 12 GeV upgrade of the JLab accelerator and the complete physics program of Hall D will be presented.« less
  • My presentation will focus on some of the latest results of the neutron spin physics program at Jefferson Laboratory in Hall A using a polarized 3He target. This program includes several completed experiments in which the spin structure functions of 3He were measured. The covered kinematic regions were these measurements were performed include the low Q2 resonance and inelastic regions and the high Q2 deep inelastic region. These experiments offer a ground for testing our understanding of the strong regime of quantum chromodynamics (QCD) through the determination of the neutron spin-dependent structure functions and their moments.
  • Recent progress from Jefferson Lab has significantly improved our understanding of the nucleon spin structure in the high-x region. Results from two experiments in Hall A are presented. The first experiment is a precision measurement of the neutron spin asymmetry, A{sub 1}{sup n}, in the high-x (valence quark) region. The results show for the first time that A{sub 1}{sup n} becomes positive at large x, strongly breaking SU(6) (spin-flavor) symmetry. The data trend is in good agreement with SU(6)-breaking valence quark models and with the fits to the previous world data. Combining the A{sub 1}{sup n} results with the worldmore » A{sub 1}{sup n} data, the up and down quark spin distributions in the nucleon were extracted. The results showed that for the proton the valence down quark spin is in the opposite direction from that of the proton, in disagreement with predictions of leading-order perturbative QCD models, which neglect quark orbital angular momentum.« less