skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Proposed measurement of tagged deep inelastic scattering in Hall A of Jefferson lab

Abstract

A tagged deep inelastic scattering (TDIS) experiment is planned for Hall A of Jefferson Lab, which will probe the mesonic content of the nucleon directly. Low momentum recoiling (and spectator) protons will be measured in coincidence with electrons scattered in a deep inelastic regime from hydrogen (and deuterium) targets, covering kinematics of 8 < W2 < 18 GeV2, 1 < Q2 < 3 (GeV/c)2 and 0:05 < x < 0:2. The tagging technique will help identify scattering from partons in the meson cloud and provide access to the pion structure function via the Sullivan process. The experiment will yield the first TDIS results in the valence regime, for both proton and neutron targets. We present here an overview of the experiment.

Authors:
 [1];  [1];  [2];  [3];  [4];  [3];  [5]
  1. Univ. of Glasgow, Scotland (United Kingdom)
  2. Mississippi State Univ., Mississippi State, MS (United States)
  3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  4. The Ohio State Univ., Columbus, OH (United States). Dept of Physics
  5. Univ. of Virginia, Charlottesville, VA (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)
Contributing Org.:
TDIS Collaboration; SBS Collaboration
OSTI Identifier:
1346871
Report Number(s):
JLAB-PHY-16-2316; DOE/OR/23177-4103
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Journal Name: AIP Conf.Proc.; Journal Volume: 1819; Journal Issue: 1; Conference: Diffraction 2016. , Santa Tecla di Acireale, Catania (Italy), 02-08 Sep 2016
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Montgomery, Rachel, Annand, John, Dutta, Dipangkar, Keppel, Cynthia E., King, Paul, Wojtsekhowski, Bogdan, and Zhang, Jixie. Proposed measurement of tagged deep inelastic scattering in Hall A of Jefferson lab. United States: N. p., 2017. Web. doi:10.1063/1.4977122.
Montgomery, Rachel, Annand, John, Dutta, Dipangkar, Keppel, Cynthia E., King, Paul, Wojtsekhowski, Bogdan, & Zhang, Jixie. Proposed measurement of tagged deep inelastic scattering in Hall A of Jefferson lab. United States. doi:10.1063/1.4977122.
Montgomery, Rachel, Annand, John, Dutta, Dipangkar, Keppel, Cynthia E., King, Paul, Wojtsekhowski, Bogdan, and Zhang, Jixie. Wed . "Proposed measurement of tagged deep inelastic scattering in Hall A of Jefferson lab". United States. doi:10.1063/1.4977122. https://www.osti.gov/servlets/purl/1346871.
@article{osti_1346871,
title = {Proposed measurement of tagged deep inelastic scattering in Hall A of Jefferson lab},
author = {Montgomery, Rachel and Annand, John and Dutta, Dipangkar and Keppel, Cynthia E. and King, Paul and Wojtsekhowski, Bogdan and Zhang, Jixie},
abstractNote = {A tagged deep inelastic scattering (TDIS) experiment is planned for Hall A of Jefferson Lab, which will probe the mesonic content of the nucleon directly. Low momentum recoiling (and spectator) protons will be measured in coincidence with electrons scattered in a deep inelastic regime from hydrogen (and deuterium) targets, covering kinematics of 8 < W2 < 18 GeV2, 1 < Q2 < 3 (GeV/c)2 and 0:05 < x < 0:2. The tagging technique will help identify scattering from partons in the meson cloud and provide access to the pion structure function via the Sullivan process. The experiment will yield the first TDIS results in the valence regime, for both proton and neutron targets. We present here an overview of the experiment.},
doi = {10.1063/1.4977122},
journal = {AIP Conf.Proc.},
number = 1,
volume = 1819,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • A Jefferson Lab experiment proposal was discussed in this talk. The experiment is designed to measure the beam-target double-spin asymmetries A^h_1n in semi-inclusive deep-inelastic {vec}n({vec}e, e' pi^+)X and {vec}n({vec}e, e' pi^-)X reactions on a longitudinally polarized ^3He target. In addition to A^h_1n, the flavor non-singlet combination A[^pi^+][_1n][^-pi^+], in which the gluons do not contribute, will be determined with high precision to extract Delta d[_v](x) independent of the knowledge of the fragmentation functions. The data will also impose strong constraints on quark and gluon polarizations through a global NLO QCD fit.
  • What constitutes the spin of the nucleon? The answer to this question is still not completely understood. Although we know the longitudinal quark spin content very well, the data on the transverse quark spin content of the nucleon is still very sparse. Semi-inclusive Deep Inelastic Scattering (SIDIS) using transversely polarized targets provide crucial information on this aspect. The data that is currently available was taken with proton and deuteron targets. The E06-010 experiment was performed at Jefferson Lab in Hall-A to measure the single spin asymmetries in the SIDIS reaction n (e, e'π ±/K ±)X using transversely polarized 3He target.more » The experiment used the continuous electron beam provided by the CEBAF accelerator with a beam energy of 5.9 GeV. Hadrons were detected in a high-resolution spectrometer in coincidence with the scattered electrons detected by the BigBite spectrometer. The kinematic coverage focuses on the valence quark region, x = 0.19 to 0.34, at Q 2 = 1.77 to 2.73 (GeV/c) 2. This is the first measurement on a neutron target. The data from this experiment, when combined with the world data on the proton and the deuteron, will provide constraints on the transversity and Sivers distribution functions on both the u and d-quarks in the valence region. In this work we report on the single spin asymmetries in the SIDIS n (e, e'π +)X reaction.« less
  • The JLab CLAS g9a/FROST experiments are double polarization measurements that have accumulated photo-production data using linearly polarized, tagged photons incident on a longitudinally polarized, frozen spin butanol target. The analysis of the resulting coherent peaks was used to determine the photon polarization, which is in agreement with phenomenological calculations.
  • We propose to measure the semi-inclusive double-spin asymmetries in deep-inelastic (,eh)X and (,eh)X reactions (h = +, -, K+ and K-) on longitudinally polarized NH3 and LiD targets. The high statistic data will allow a leading order five-flavor decomposition (Delta u, Delta d, Delta u, Delta d, Delta s ) of the nucleon spin structure in the region of x = 0.12 {approx} 0.43 at a Q2 of 1.21 {approx} 3.22 GeV2. The combined spin dependent pi+ + pi- yield ratios will be measured, since the acceptance and the hadron efficiencies of the detectors can be accurately determined. Independent ofmore » fragmentation functions and parton distributions, the z-dependence (z = 0.38 {approx} 0.71) of the combined ratios provides a build-in test of factorization at the moderate Q2. We estimate statistical uncertainties associated with such measurements.« less
  • Recent results on the Generalized Parton Distribution (GPD) program at Jefferson Lab (JLab) will be presented. The emphasis will be in the Hall A program aiming at measuring Q2-dependences of different terms of the Deeply Virtual Compton Scattering (DVCS) cross section. This is a fundamental step before one can extract GPD information from JLab DVCS data. The upcoming program in Hall A, using both a 6 GeV beam (2010) and a 11 GeV beam (≈ 2015) will also be described.