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Title: Measurement of the proton $$A_1$$ and $$A_2$$ spin asymmetries. Probing Color Forces

Abstract

The Spin Asymmetries of the Nucleon Experiment (SANE) measured the proton spin structure function $$g_2$$ in a range of Bjorken x, 0.3 < x < 0.8, where extraction of the twist-3 matrix element $$d_2^p$$ (an integral of $$g_2$$ weighted by $x^2$) is most sensitive. The data was taken from $Q^2$ equal to 2.5 $GeV^2$ up to 6.5 $GeV^2$. In this polarized electron scattering off a polarized hydrogen target experiment, two double spin asymmetries, A∥ and A⊥ were measured using the BETA (Big Electron Telescope Array) Detector. BETA consisted of a scintillator hodoscope, gas Cerenkov counter, lucite hodoscope and a large lead glass electromagnetic calorimeter. With a unique open geometry, a threshold gas Cerenkov detector allowed BETA to cleanly identify electrons for this inclusive experiment. A measurement of $$d_2^p$$ is compared to lattice QCD calculations.

Authors:
 [1]
  1. Temple University, Philadelphia, PA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1190860
Report Number(s):
JLAB-PHY-15-2094; DOE/OR/23177-3454
DOE Contract Number:  
AC05-06OR23177
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Armstrong, Whitney. Measurement of the proton $A_1$ and $A_2$ spin asymmetries. Probing Color Forces. United States: N. p., 2015. Web. doi:10.2172/1190860.
Armstrong, Whitney. Measurement of the proton $A_1$ and $A_2$ spin asymmetries. Probing Color Forces. United States. doi:10.2172/1190860.
Armstrong, Whitney. Fri . "Measurement of the proton $A_1$ and $A_2$ spin asymmetries. Probing Color Forces". United States. doi:10.2172/1190860. https://www.osti.gov/servlets/purl/1190860.
@article{osti_1190860,
title = {Measurement of the proton $A_1$ and $A_2$ spin asymmetries. Probing Color Forces},
author = {Armstrong, Whitney},
abstractNote = {The Spin Asymmetries of the Nucleon Experiment (SANE) measured the proton spin structure function $g_2$ in a range of Bjorken x, 0.3 < x < 0.8, where extraction of the twist-3 matrix element $d_2^p$ (an integral of $g_2$ weighted by $x^2$) is most sensitive. The data was taken from $Q^2$ equal to 2.5 $GeV^2$ up to 6.5 $GeV^2$. In this polarized electron scattering off a polarized hydrogen target experiment, two double spin asymmetries, A∥ and A⊥ were measured using the BETA (Big Electron Telescope Array) Detector. BETA consisted of a scintillator hodoscope, gas Cerenkov counter, lucite hodoscope and a large lead glass electromagnetic calorimeter. With a unique open geometry, a threshold gas Cerenkov detector allowed BETA to cleanly identify electrons for this inclusive experiment. A measurement of $d_2^p$ is compared to lattice QCD calculations.},
doi = {10.2172/1190860},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {5}
}

Thesis/Dissertation:
Other availability
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