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Target independence of the EMC-SMC effect

Stephan Narison, G. Veneziano, Graham Shore

Nuclear Physics B, Volume: "B433", Issue: 1, Pages: 209 - 233

Swansea University Author: Graham Shore

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DOI (Published version): 10.1016/0550-3213(94)00329-D

Abstract

\noindent{\bf Abstract} \vskip0.2cm \noindent An approach to deep inelastic scattering is described in which the matrix elements arising from the operator product expansion are factorised into composite operator propagators and proper vertex functions. In the case of polarised $\m p$ scattering, the...

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Published in: Nuclear Physics B
ISSN: 05503213
Published: 1994
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URI: https://cronfa.swan.ac.uk/Record/cronfa31911
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fullrecord <?xml version="1.0"?><rfc1807><datestamp>2017-02-09T13:49:29.9302622</datestamp><bib-version>v2</bib-version><id>31911</id><entry>2017-02-09</entry><title>Target independence of the EMC-SMC effect</title><swanseaauthors><author><sid>28a24f55687c82d6f3ee378ead3cf234</sid><firstname>Graham</firstname><surname>Shore</surname><name>Graham Shore</name><active>true</active><ethesisStudent>false</ethesisStudent></author></swanseaauthors><date>2017-02-09</date><deptcode>FGSEN</deptcode><abstract>\noindent{\bf Abstract} \vskip0.2cm \noindent An approach to deep inelastic scattering is described in which the matrix elements arising from the operator product expansion are factorised into composite operator propagators and proper vertex functions. In the case of polarised $\m p$ scattering, the composite operator propagator is identified with the square root of the QCD topological susceptibility $\sqrt{\chi~{\prime}(0)}$, while the corresponding proper vertex is a renormalisation group invariant. We estimate $\chi~{\prime}(0)$ using QCD spectral sum rules and find that it is significantly suppressed relative to the OZI expectation. Assuming OZI is a good approximation for the proper vertex, our predictions, $\int_{0}~{1}dx g_1~p (x;Q~2=10\GV~2)= 0.143 \pm 0.005$ and $G~{(0)}_A \equiv \Delta \Sigma = 0.353 \pm 0.052$, are in excellent agreement with the new SMC data. This result, together with one confirming the validity of the OZI rule in the $\hp$ radiative decay, supports our earlier conjecture that the suppression in the flavour singlet component of the first moment of $g_1~p$ observed by the EMC-SMC collaboration is a target-independent feature of QCD related to the $U(1)$ anomaly and is not a property of the proton structure. As a corollary, we extract the magnitude of higher twist effects from the neutron and Bjorken sum</abstract><type>Journal Article</type><journal>Nuclear Physics B</journal><volume>"B433"</volume><journalNumber>1</journalNumber><paginationStart>209</paginationStart><paginationEnd>233</paginationEnd><publisher/><issnPrint>05503213</issnPrint><keywords/><publishedDay>31</publishedDay><publishedMonth>5</publishedMonth><publishedYear>1994</publishedYear><publishedDate>1994-05-31</publishedDate><doi>10.1016/0550-3213(94)00329-D</doi><url>http://inspirehep.net/record/37917</url><notes/><college>COLLEGE NANME</college><department>Science and Engineering - Faculty</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>FGSEN</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2017-02-09T13:49:29.9302622</lastEdited><Created>2017-02-09T13:49:29.4466550</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Biosciences, Geography and Physics - Physics</level></path><authors><author><firstname>Stephan</firstname><surname>Narison</surname><order>1</order></author><author><firstname>G.</firstname><surname>Veneziano</surname><order>2</order></author><author><firstname>Graham</firstname><surname>Shore</surname><order>3</order></author></authors><documents/><OutputDurs/></rfc1807>
spelling 2017-02-09T13:49:29.9302622 v2 31911 2017-02-09 Target independence of the EMC-SMC effect 28a24f55687c82d6f3ee378ead3cf234 Graham Shore Graham Shore true false 2017-02-09 FGSEN \noindent{\bf Abstract} \vskip0.2cm \noindent An approach to deep inelastic scattering is described in which the matrix elements arising from the operator product expansion are factorised into composite operator propagators and proper vertex functions. In the case of polarised $\m p$ scattering, the composite operator propagator is identified with the square root of the QCD topological susceptibility $\sqrt{\chi~{\prime}(0)}$, while the corresponding proper vertex is a renormalisation group invariant. We estimate $\chi~{\prime}(0)$ using QCD spectral sum rules and find that it is significantly suppressed relative to the OZI expectation. Assuming OZI is a good approximation for the proper vertex, our predictions, $\int_{0}~{1}dx g_1~p (x;Q~2=10\GV~2)= 0.143 \pm 0.005$ and $G~{(0)}_A \equiv \Delta \Sigma = 0.353 \pm 0.052$, are in excellent agreement with the new SMC data. This result, together with one confirming the validity of the OZI rule in the $\hp$ radiative decay, supports our earlier conjecture that the suppression in the flavour singlet component of the first moment of $g_1~p$ observed by the EMC-SMC collaboration is a target-independent feature of QCD related to the $U(1)$ anomaly and is not a property of the proton structure. As a corollary, we extract the magnitude of higher twist effects from the neutron and Bjorken sum Journal Article Nuclear Physics B "B433" 1 209 233 05503213 31 5 1994 1994-05-31 10.1016/0550-3213(94)00329-D http://inspirehep.net/record/37917 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2017-02-09T13:49:29.9302622 2017-02-09T13:49:29.4466550 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics Stephan Narison 1 G. Veneziano 2 Graham Shore 3
title Target independence of the EMC-SMC effect
spellingShingle Target independence of the EMC-SMC effect
Graham Shore
title_short Target independence of the EMC-SMC effect
title_full Target independence of the EMC-SMC effect
title_fullStr Target independence of the EMC-SMC effect
title_full_unstemmed Target independence of the EMC-SMC effect
title_sort Target independence of the EMC-SMC effect
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 "B433"
container_issue 1
container_start_page 209
publishDate 1994
institution Swansea University
issn 05503213
doi_str_mv 10.1016/0550-3213(94)00329-D
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/37917
document_store_str 0
active_str 0
description \noindent{\bf Abstract} \vskip0.2cm \noindent An approach to deep inelastic scattering is described in which the matrix elements arising from the operator product expansion are factorised into composite operator propagators and proper vertex functions. In the case of polarised $\m p$ scattering, the composite operator propagator is identified with the square root of the QCD topological susceptibility $\sqrt{\chi~{\prime}(0)}$, while the corresponding proper vertex is a renormalisation group invariant. We estimate $\chi~{\prime}(0)$ using QCD spectral sum rules and find that it is significantly suppressed relative to the OZI expectation. Assuming OZI is a good approximation for the proper vertex, our predictions, $\int_{0}~{1}dx g_1~p (x;Q~2=10\GV~2)= 0.143 \pm 0.005$ and $G~{(0)}_A \equiv \Delta \Sigma = 0.353 \pm 0.052$, are in excellent agreement with the new SMC data. This result, together with one confirming the validity of the OZI rule in the $\hp$ radiative decay, supports our earlier conjecture that the suppression in the flavour singlet component of the first moment of $g_1~p$ observed by the EMC-SMC collaboration is a target-independent feature of QCD related to the $U(1)$ anomaly and is not a property of the proton structure. As a corollary, we extract the magnitude of higher twist effects from the neutron and Bjorken sum
published_date 1994-05-31T03:39:02Z
_version_ 1763751747917971456
score 10.950203

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