Nucleon tensor charges and electric dipole moments
Abstract
A symmetrypreserving DysonSchwinger equation treatment of a vectorvector contact interaction is used to compute dressedquarkcore contributions to the nucleon sigmaterm and tensor charges. The latter enable one to directly determine the effect of dressedquark electric dipole moments (EDMs) on neutron and proton EDMs. The presence of strong scalar and axialvector diquark correlations within groundstate baryons is a prediction of this approach. These correlations are active participants in all scattering events and thereby modify the contribution of the singly represented valence quark relative to that of the doubly represented quark. Regarding the proton sigmaterm and that part of the proton mass which owes to explicit chiral symmetry breaking, with a realistic du mass splitting, the singly represented d quark contributes 37% more than the doubly represented u quark; and in connection with the proton's tensor charges, delta(T)u, delta(T)d, the ratio delta(T)d/delta(T)u is 18% larger than anticipated from simple quark models. Of particular note, the size of delta(T)d is a sensitive measure of the strength of dynamical chiral symmetry breaking; and dTd measures the amount of axialvector diquark correlation within the proton, vanishing if such correlations are absent.
 Authors:
 Publication Date:
 Research Org.:
 Argonne National Lab. (ANL), Argonne, IL (United States)
 Sponsoring Org.:
 USDOE Office of Science  Office of Nuclear Physics
 OSTI Identifier:
 1391818
 DOE Contract Number:
 AC0206CH11357
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physical Review. D, Particles, Fields, Gravitation and Cosmology; Journal Volume: 91; Journal Issue: 7
 Country of Publication:
 United States
 Language:
 English
Citation Formats
Pitschmann, Mario, Seng, ChienYeah, Roberts, Craig D., and Schmidt, Sebastian M. Nucleon tensor charges and electric dipole moments. United States: N. p., 2015.
Web. doi:10.1103/PhysRevD.91.074004.
Pitschmann, Mario, Seng, ChienYeah, Roberts, Craig D., & Schmidt, Sebastian M. Nucleon tensor charges and electric dipole moments. United States. doi:10.1103/PhysRevD.91.074004.
Pitschmann, Mario, Seng, ChienYeah, Roberts, Craig D., and Schmidt, Sebastian M. 2015.
"Nucleon tensor charges and electric dipole moments". United States.
doi:10.1103/PhysRevD.91.074004.
@article{osti_1391818,
title = {Nucleon tensor charges and electric dipole moments},
author = {Pitschmann, Mario and Seng, ChienYeah and Roberts, Craig D. and Schmidt, Sebastian M.},
abstractNote = {A symmetrypreserving DysonSchwinger equation treatment of a vectorvector contact interaction is used to compute dressedquarkcore contributions to the nucleon sigmaterm and tensor charges. The latter enable one to directly determine the effect of dressedquark electric dipole moments (EDMs) on neutron and proton EDMs. The presence of strong scalar and axialvector diquark correlations within groundstate baryons is a prediction of this approach. These correlations are active participants in all scattering events and thereby modify the contribution of the singly represented valence quark relative to that of the doubly represented quark. Regarding the proton sigmaterm and that part of the proton mass which owes to explicit chiral symmetry breaking, with a realistic du mass splitting, the singly represented d quark contributes 37% more than the doubly represented u quark; and in connection with the proton's tensor charges, delta(T)u, delta(T)d, the ratio delta(T)d/delta(T)u is 18% larger than anticipated from simple quark models. Of particular note, the size of delta(T)d is a sensitive measure of the strength of dynamical chiral symmetry breaking; and dTd measures the amount of axialvector diquark correlation within the proton, vanishing if such correlations are absent.},
doi = {10.1103/PhysRevD.91.074004},
journal = {Physical Review. D, Particles, Fields, Gravitation and Cosmology},
number = 7,
volume = 91,
place = {United States},
year = 2015,
month = 4
}

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