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Title: Polarized electron-deuteron deep-inelastic scattering with spectator nucleon tagging

Abstract

Background: Deep-inelastic scattering (DIS) on the polarized deuteron with detection of a proton in the nuclear breakup region (spectator tagging) represents a unique method for extracting the neutron spin structure functions and studying nuclear modifications. The tagged proton momentum controls the nuclear configuration during the DIS process and enables a differential analysis of nuclear effects. Such measurements could be performed with the future electron-ion collider (EIC) and forward proton detectors if deuteron beam polarization could be achieved. Purpose: Develop a theoretical framework for polarized deuteron DIS with spectator tagging. Formulate practical procedures for neutron spin structure extraction. Methods: A covariant spin density matrix formalism is used to describe general deuteron polarization in collider experiments (vector/tensor, pure/mixed). Light-front (LF) quantum mechanics is employed to factorize nuclear and nucleonic structure in the DIS process. A four-dimensional representation of LF spin structure is used to construct the polarized deuteron LF wave function and efficiently evaluate the spin sums. Free neutron structure is extracted using the impulse approximation and analyticity in the tagged proton momentum (pole extrapolation). Results: General expressions of the polarized tagged DIS observables in collider experiments are presented. The polarized deuteron LF spectral function and nucleon momentum distributions are characterized inmore » analytic and numerical form. Practical procedures for neutron spin structure extraction from the tagged deuteron spin asymmetries are proposed. Conclusions: Spectator tagging provides new tools for precise neutron spin structure measurements. D-wave depolarization and nuclear binding effects can be eliminated through the tagged proton momentum dependence. The methods can be extended to tensor-polarized observables, spin-orbit effects, and diffractive processes.« less

Authors:
ORCiD logo;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
2325524
Alternate Identifier(s):
OSTI ID: 1735983
Report Number(s):
JLAB-THY-20-3203; DOE/OR/23177-4982; arXiv:2006.03033
Journal ID: ISSN 2469-9985; PRVCAN; 065204
Grant/Contract Number:  
AC05-06OR23177
Resource Type:
Published Article
Journal Name:
Physical Review. C
Additional Journal Information:
Journal Name: Physical Review. C Journal Volume: 102 Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Cosyn, W., and Weiss, C. Polarized electron-deuteron deep-inelastic scattering with spectator nucleon tagging. United States: N. p., 2020. Web. doi:10.1103/PhysRevC.102.065204.
Cosyn, W., & Weiss, C. Polarized electron-deuteron deep-inelastic scattering with spectator nucleon tagging. United States. https://doi.org/10.1103/PhysRevC.102.065204
Cosyn, W., and Weiss, C. Wed . "Polarized electron-deuteron deep-inelastic scattering with spectator nucleon tagging". United States. https://doi.org/10.1103/PhysRevC.102.065204.
@article{osti_2325524,
title = {Polarized electron-deuteron deep-inelastic scattering with spectator nucleon tagging},
author = {Cosyn, W. and Weiss, C.},
abstractNote = {Background: Deep-inelastic scattering (DIS) on the polarized deuteron with detection of a proton in the nuclear breakup region (spectator tagging) represents a unique method for extracting the neutron spin structure functions and studying nuclear modifications. The tagged proton momentum controls the nuclear configuration during the DIS process and enables a differential analysis of nuclear effects. Such measurements could be performed with the future electron-ion collider (EIC) and forward proton detectors if deuteron beam polarization could be achieved. Purpose: Develop a theoretical framework for polarized deuteron DIS with spectator tagging. Formulate practical procedures for neutron spin structure extraction. Methods: A covariant spin density matrix formalism is used to describe general deuteron polarization in collider experiments (vector/tensor, pure/mixed). Light-front (LF) quantum mechanics is employed to factorize nuclear and nucleonic structure in the DIS process. A four-dimensional representation of LF spin structure is used to construct the polarized deuteron LF wave function and efficiently evaluate the spin sums. Free neutron structure is extracted using the impulse approximation and analyticity in the tagged proton momentum (pole extrapolation). Results: General expressions of the polarized tagged DIS observables in collider experiments are presented. The polarized deuteron LF spectral function and nucleon momentum distributions are characterized in analytic and numerical form. Practical procedures for neutron spin structure extraction from the tagged deuteron spin asymmetries are proposed. Conclusions: Spectator tagging provides new tools for precise neutron spin structure measurements. D-wave depolarization and nuclear binding effects can be eliminated through the tagged proton momentum dependence. The methods can be extended to tensor-polarized observables, spin-orbit effects, and diffractive processes.},
doi = {10.1103/PhysRevC.102.065204},
journal = {Physical Review. C},
number = 6,
volume = 102,
place = {United States},
year = {Wed Dec 16 00:00:00 EST 2020},
month = {Wed Dec 16 00:00:00 EST 2020}
}

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