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Target independence of the ‘proton spin’ effect

G.M. Shore, Graham Shore

Nuclear Physics B - Proceedings Supplements, Volume: "39BC", Issue: 2-3, Pages: 101 - 105

Swansea University Author: Graham Shore

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DOI (Published version): 10.1016/0920-5632(95)00051-A

Abstract

Recent work by the author in collaboration with S. Narison and G. Veneziano on the EMC-SMC-SLAC `proton spin' effect is reviewed. This uses a novel approach to deep inelastic scattering in which the matrix elements arising from the OPE are factorised into composite operator propagators and prop...

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Published in: Nuclear Physics B - Proceedings Supplements
ISSN: 09205632
Published: 1994
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URI: https://cronfa.swan.ac.uk/Record/cronfa31910
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first_indexed 2017-02-09T20:45:12Z
last_indexed 2018-02-09T05:19:16Z
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spelling 2017-02-09T13:49:28.7602509 v2 31910 2017-02-09 Target independence of the ‘proton spin’ effect 28a24f55687c82d6f3ee378ead3cf234 Graham Shore Graham Shore true false 2017-02-09 FGSEN Recent work by the author in collaboration with S. Narison and G. Veneziano on the EMC-SMC-SLAC `proton spin' effect is reviewed. This uses a novel approach to deep inelastic scattering in which the matrix elements arising from the OPE are factorised into composite operator propagators and proper vertices. For polarised $\mu p$ scattering, the composite operator propagator is equated to the square root of the first moment of the QCD topological susceptibility, $\sqrt{\chi~\prime(0)}$. We evaluate $\chi~\prime(0)$ using QCD spectral sum rules and find a significant suppression relative to its OZI expectation. This is identified as the source of the violation of the Ellis-Jaffe sum rule for the first moment of the polarised proton structure function $g_1~p$. Our predictions, $\int_0~1 dx g_1~p(x;Q~2=10GeV~2) = 0.143\pm 0.005$ and $\Delta\Sigma =0.353\pm 0.052$, are in excellent agreement with the new SMC data. This supports our earlier conjecture that the suppression in the flavour singlet component of the first moment of $g_1~p$ is a target-independent feature of QCD related to the $U(1)$ anomaly and is not a special property of the proton Conference Paper/Proceeding/Abstract Nuclear Physics B - Proceedings Supplements "39BC" 2-3 101 105 09205632 31 7 1994 1994-07-31 10.1016/0920-5632(95)00051-A http://inspirehep.net/record/379257 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2017-02-09T13:49:28.7602509 2017-02-09T13:49:28.2610853 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics G.M. Shore 1 Graham Shore 2
title Target independence of the ‘proton spin’ effect
spellingShingle Target independence of the ‘proton spin’ effect
Graham Shore
title_short Target independence of the ‘proton spin’ effect
title_full Target independence of the ‘proton spin’ effect
title_fullStr Target independence of the ‘proton spin’ effect
title_full_unstemmed Target independence of the ‘proton spin’ effect
title_sort Target independence of the ‘proton spin’ effect
author_id_str_mv 28a24f55687c82d6f3ee378ead3cf234
author_id_fullname_str_mv 28a24f55687c82d6f3ee378ead3cf234_***_Graham Shore
author Graham Shore
author2 G.M. Shore
Graham Shore
format Conference Paper/Proceeding/Abstract
container_title Nuclear Physics B - Proceedings Supplements
container_volume "39BC"
container_issue 2-3
container_start_page 101
publishDate 1994
institution Swansea University
issn 09205632
doi_str_mv 10.1016/0920-5632(95)00051-A
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/379257
document_store_str 0
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description Recent work by the author in collaboration with S. Narison and G. Veneziano on the EMC-SMC-SLAC `proton spin' effect is reviewed. This uses a novel approach to deep inelastic scattering in which the matrix elements arising from the OPE are factorised into composite operator propagators and proper vertices. For polarised $\mu p$ scattering, the composite operator propagator is equated to the square root of the first moment of the QCD topological susceptibility, $\sqrt{\chi~\prime(0)}$. We evaluate $\chi~\prime(0)$ using QCD spectral sum rules and find a significant suppression relative to its OZI expectation. This is identified as the source of the violation of the Ellis-Jaffe sum rule for the first moment of the polarised proton structure function $g_1~p$. Our predictions, $\int_0~1 dx g_1~p(x;Q~2=10GeV~2) = 0.143\pm 0.005$ and $\Delta\Sigma =0.353\pm 0.052$, are in excellent agreement with the new SMC data. This supports our earlier conjecture that the suppression in the flavour singlet component of the first moment of $g_1~p$ is a target-independent feature of QCD related to the $U(1)$ anomaly and is not a special property of the proton
published_date 1994-07-31T03:39:02Z
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score 11.035655

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