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Title: Novel Physics with Tensor Polarized Deuteron Targets

Abstract

Development of solid spin-1 polarized targets will open the study of tensor structure functions to precise measurement, and holds the promise to enable a new generation of polarized scattering experiments. In this talk we will discuss a measurement of the leading twist tensor structure function b1, along with prospects for future experiments with a solid tensor polarized target. The recently approved JLab experiment E12-13-011 will measure the lead- ing twist tensor structure function b1, which provides a unique tool to study partonic effects, while also being sensitive to coherent nuclear properties in the simplest nuclear system. At low x, shadowing effects are expected to dominate b1, while at larger values, b1 provides a clean probe of exotic QCD effects, such as hidden color due to 6-quark configuration. Since the deuteron wave function is relatively well known, any non-standard effects are expected to be readily observable. All available models predict a small or vanishing value of b1 at moderate x. However, the first pioneer measurement of b1 at HERMES revealed a crossover to an anomalously large negative value in the region 0.2 < x < 0.5, albeit with relatively large experimental uncertainty. E12-13-011 will perform an inclusive measurement of the deuteronmore » tensor asymmetry in the region 0.16 < x < 0.49, for 0.8 < Q2 < 5.0 GeV2. The UVa solid polarized ND3 target will be used, along with the Hall C spectrometers, and an unpolarized 115 nA beam. This measurement will provide access to the tensor quark polarization, and allow a test of the Close-Kumano sum rule, which vanishes in the absence of tensor polarization in the quark sea. Until now, tensor structure has been largely unexplored, so the study of these quantities holds the potential of initiating a new field of spin physics at Jefferson Lab.« less

Authors:
 [1];  [1]
  1. UNH
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:
1149584
Report Number(s):
JLAB-PHY-13-1783; DOE/OR/23177-2849; arXiv:1311.4835
DOE Contract Number:
AC05-06OR23177
Resource Type:
Conference
Resource Relation:
Journal Name: PoS PSTP2013; Conference: PSTP 2013 (15th International Workshop on Polarized Sources, Targets, and Polarimetry), 09-13 Sep 2013. Charlottesville, VA, USA
Country of Publication:
United States
Language:
English

Citation Formats

Slifer, Karl J., and Long, Elena A.. Novel Physics with Tensor Polarized Deuteron Targets. United States: N. p., 2013. Web.
Slifer, Karl J., & Long, Elena A.. Novel Physics with Tensor Polarized Deuteron Targets. United States.
Slifer, Karl J., and Long, Elena A.. Sun . "Novel Physics with Tensor Polarized Deuteron Targets". United States. doi:. https://www.osti.gov/servlets/purl/1149584.
@article{osti_1149584,
title = {Novel Physics with Tensor Polarized Deuteron Targets},
author = {Slifer, Karl J. and Long, Elena A.},
abstractNote = {Development of solid spin-1 polarized targets will open the study of tensor structure functions to precise measurement, and holds the promise to enable a new generation of polarized scattering experiments. In this talk we will discuss a measurement of the leading twist tensor structure function b1, along with prospects for future experiments with a solid tensor polarized target. The recently approved JLab experiment E12-13-011 will measure the lead- ing twist tensor structure function b1, which provides a unique tool to study partonic effects, while also being sensitive to coherent nuclear properties in the simplest nuclear system. At low x, shadowing effects are expected to dominate b1, while at larger values, b1 provides a clean probe of exotic QCD effects, such as hidden color due to 6-quark configuration. Since the deuteron wave function is relatively well known, any non-standard effects are expected to be readily observable. All available models predict a small or vanishing value of b1 at moderate x. However, the first pioneer measurement of b1 at HERMES revealed a crossover to an anomalously large negative value in the region 0.2 < x < 0.5, albeit with relatively large experimental uncertainty. E12-13-011 will perform an inclusive measurement of the deuteron tensor asymmetry in the region 0.16 < x < 0.49, for 0.8 < Q2 < 5.0 GeV2. The UVa solid polarized ND3 target will be used, along with the Hall C spectrometers, and an unpolarized 115 nA beam. This measurement will provide access to the tensor quark polarization, and allow a test of the Close-Kumano sum rule, which vanishes in the absence of tensor polarization in the quark sea. Until now, tensor structure has been largely unexplored, so the study of these quantities holds the potential of initiating a new field of spin physics at Jefferson Lab.},
doi = {},
journal = {PoS PSTP2013},
number = ,
volume = ,
place = {United States},
year = {Sun Sep 01 00:00:00 EDT 2013},
month = {Sun Sep 01 00:00:00 EDT 2013}
}

Conference:
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  • Seven previously unmeasured spin asymmetries and ten previously unmeasured spin transfer observable have been determined in the momentum transfer range, 0.12<-t<0.85 (GeV/c)/sup 2/. We used a 1600 MeV polarized deuteron beam incident on a polarized hydrogen target in these measurements. This is equivalent to using an 800 MeV proton beam on a deuteron target. These observables are poorly predicted by the relativistic impulse approximation, which has been used successfully to reproduce spin observables for protons on spin-zero nuclei.
  • The performance and the developments of tensor polarized ND{sub 3} targets at Bonn is discussed. In a short test the relaxation behavior of a standard polycrystalline sample was examined at a reduced magnetic field of 0.38 T. This test indicates that in frozen spin samples Boltzmann distribution may not hold. A Boltzmann-independent method for measuring tensor polarization is sketched. With respect to applications in frozen spin targets, the non-adiabatic enhancement of tensor polarization by RF-saturation of the polarization signal was examined. Essential for this method is a good line separation which has been achieved by growing single crystals of ND{submore » 3}. We are now able to identify the orientation of such a crystal by its polarization signal.« less
  • Individual papers were abstracted separately for the data base.
  • This volume contains the proceedings of the topical conference on Physics with Polarized Beams on Polarized Targets held at McCormick's Creek State Park in Spencer, Indiana, October 16-18, 1989. This is the sixth in a series of conferences on various topics organized by the Indiana University Cyclotron facility, the last having been held in 1985. The conference was attended by 116 physicists from 7 countries. In particular it was the author's pleasure to host 5 scientists from the Soviet Union. The authors hope that the author's colleagues from the U.S.S.R. will be able to continue coming to meetings in themore » west and that in the future their attendance will not be so notable, having become standard practice. The topic of the conference was chosen to highlight the interesting physics that is being done with polarized beams and polarized targets (where the and is meant to be a logic operator). By selecting a topic centered on a technique the authors were able to bring together physicists from a number of subfields, including low- and intermediate-energy nuclear physics, and particle physics. The physics also covered a broad range of topics, including work to investigate fundamental symmetries of nature, the structure of nucleons, nucleon-nucleon interactions, nuclear structure, and more. The author's purpose in having such a broadly defined conference was to encourage the exchange of ideas and information among the participants from the various subfields with different primary interests, and hopefully to stimulate new ideas.« less