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Topological charge screening and the ‘proton spin’ beyond the chiral limit

Stephan Narison, G. Veneziano, Graham Shore

Nuclear Physics B, Volume: "B546", Issue: 1-2, Pages: 235 - 278

Swansea University Author: Graham Shore

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DOI (Published version): 10.1016/S0550-3213(99)00061-9

Abstract

The theory of the `proton spin' effect proposed in our earlier papers is extended to include the chiral SU(3) symmetry breaking and flavour mixing induced by non-vanishing quark masses in QCD. The theoretical basis is the derivation of exact, unified Goldberger-Treiman (GT) relations valid beyo...

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Published in: Nuclear Physics B
ISSN: 05503213
Published: 1998
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URI: https://cronfa.swan.ac.uk/Record/cronfa31902
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last_indexed 2018-02-09T05:19:15Z
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spelling 2017-02-09T13:49:19.0100753 v2 31902 2017-02-09 Topological charge screening and the ‘proton spin’ beyond the chiral limit 28a24f55687c82d6f3ee378ead3cf234 Graham Shore Graham Shore true false 2017-02-09 FGSEN The theory of the `proton spin' effect proposed in our earlier papers is extended to include the chiral SU(3) symmetry breaking and flavour mixing induced by non-vanishing quark masses in QCD. The theoretical basis is the derivation of exact, unified Goldberger-Treiman (GT) relations valid beyond the chiral limit. The observed suppression in the flavour singlet axial charge $a^0(Q^2)$ is explained by an anomalously small value for the slope of the singlet current correlation function $<0|T~\pl^\m J_{\m 5}^0 ~ \pl^\n J_{\n 5}^0 |0>$, a consequence of the screening of topological charge in the QCD vacuum. Numerical predictions are obtained by evaluating the current correlation functions using QCD spectral sum rules. The results, $a^0(Q^2) = 0.31 \pm 0.02$ and $\int dx ~g_1^p(x,Q^2) = 0.141 \pm 0.005$ (at $Q^2=10 \~\GV^2$), are in good agreement with current experimental data on the polarised proton structure function Journal Article Nuclear Physics B "B546" 1-2 235 278 05503213 31 12 1998 1998-12-31 10.1016/S0550-3213(99)00061-9 http://inspirehep.net/record/480795 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2017-02-09T13:49:19.0100753 2017-02-09T13:49:18.4640619 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Stephan Narison 1 G. Veneziano 2 Graham Shore 3
title Topological charge screening and the ‘proton spin’ beyond the chiral limit
spellingShingle Topological charge screening and the ‘proton spin’ beyond the chiral limit
Graham Shore
title_short Topological charge screening and the ‘proton spin’ beyond the chiral limit
title_full Topological charge screening and the ‘proton spin’ beyond the chiral limit
title_fullStr Topological charge screening and the ‘proton spin’ beyond the chiral limit
title_full_unstemmed Topological charge screening and the ‘proton spin’ beyond the chiral limit
title_sort Topological charge screening and the ‘proton spin’ beyond the chiral limit
author_id_str_mv 28a24f55687c82d6f3ee378ead3cf234
author_id_fullname_str_mv 28a24f55687c82d6f3ee378ead3cf234_***_Graham Shore
author Graham Shore
author2 Stephan Narison
G. Veneziano
Graham Shore
format Journal article
container_title Nuclear Physics B
container_volume "B546"
container_issue 1-2
container_start_page 235
publishDate 1998
institution Swansea University
issn 05503213
doi_str_mv 10.1016/S0550-3213(99)00061-9
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
url http://inspirehep.net/record/480795
document_store_str 0
active_str 0
description The theory of the `proton spin' effect proposed in our earlier papers is extended to include the chiral SU(3) symmetry breaking and flavour mixing induced by non-vanishing quark masses in QCD. The theoretical basis is the derivation of exact, unified Goldberger-Treiman (GT) relations valid beyond the chiral limit. The observed suppression in the flavour singlet axial charge $a^0(Q^2)$ is explained by an anomalously small value for the slope of the singlet current correlation function $<0|T~\pl^\m J_{\m 5}^0 ~ \pl^\n J_{\n 5}^0 |0>$, a consequence of the screening of topological charge in the QCD vacuum. Numerical predictions are obtained by evaluating the current correlation functions using QCD spectral sum rules. The results, $a^0(Q^2) = 0.31 \pm 0.02$ and $\int dx ~g_1^p(x,Q^2) = 0.141 \pm 0.005$ (at $Q^2=10 \~\GV^2$), are in good agreement with current experimental data on the polarised proton structure function
published_date 1998-12-31T03:39:01Z
_version_ 1763751746823258112
score 11.035655

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