The spin structure function <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msubsup><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mi mathvariant="normal">p</mml:mi></mml:mrow></mml:msubsup></mml:math> of the proton and a test of the Bjorken sum rule
- Adolph, C.
- Akhunzyanov, R.
- Alexeev, M.
- Alexeev, G.
- Amoroso, A.
- Andrieux, V.
- Anosov, V.
- Austregesilo, A.
- Azevedo, C.
- Badełek, B.
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- Guskov, A.
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DOIAbstract
International audienceNew results for the double spin asymmetry A(1)(p) and the proton longitudinal spin structure function g(1)(p) are presented. They were obtained by the COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally polarised NH3 target. The data were collected in 2011 and complement those recorded in 2007 at 160 GeV, in particular at lower values of x. They improve the statistical precision of g(1)(p)(x) by about a factor of two in the region x less than or similar to 0.02. A next-to-leading order QCD fit to the g(1) world data is performed. It leads to a new determination of the quark spin contribution to the nucleon spin, Delta Sigma, ranging from 0.26 to 0.36, and to a re-evaluation of the first m...
Add to ORKG![The spin structure function <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msubsup><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mi mathvariant="normal">p</mml:mi></mml:mrow></mml:msubsup></mml:math> of the proton and a test of the Bjorken sum rule](/en/item/80144887/The-spin-structure-function-lessmml:math-altimg"si1.gif"-overflow"scroll"-xmlns:xocs"http:www.elsevier.comxmlxocsdtd"-xmlns:xs"http:www.w3.org2001XMLSchema"-xmlns:xsi"http:www.w3.org2001XMLSchema-instance"-xmlns"http:www.elsevier.comxmljadtd"-xmlns:ja"http:www.elsevier.comxmljadtd"-xmlns:mml"http:www.w3.org1998MathMathML"-xmlns:tb"http:www.elsevier.comxmlcommontabledtd"-xmlns:sb"http:www.elsevier.comxmlcommonstruct-bibdtd"-xmlns:ce"http:www.elsevier.comxmlcommondtd"-xmlns:xlink"http:www.w3.org1999xlink"-xmlns:cals"http:www.elsevier.comxmlcommoncalsdtd"-xmlns:sa"http:www.elsevier.comxmlcommonstruct-affdtd"greaterlessmml:msubsupgreaterlessmml:mrowgreaterlessmml:migreaterglessmml:migreaterlessmml:mrowgreaterlessmml:mrowgreaterlessmml:mngreater1lessmml:mngreaterlessmml:mrowgreaterlessmml:mrowgreaterlessmml:mi-mathvariant"normal"greaterplessmml:migreaterlessmml:mrowgreaterlessmml:msubsupgreaterlessmml:mathgreater-of-the-proton-and-a-test-of-the-Bjorken-sum-rule){kind=link}
![The spin structure function <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:cals="http://www.elsevier.com/xml/common/cals/dtd" xmlns:sa="http://www.elsevier.com/xml/common/struct-aff/dtd"><mml:msubsup><mml:mrow><mml:mi>g</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mi mathvariant="normal">p</mml:mi></mml:mrow></mml:msubsup></mml:math> of the proton and a test of the Bjorken sum rule](/en/item/78775755/The-spin-structure-function-lessmml:math-altimg"si1.gif"-overflow"scroll"-xmlns:xocs"http:www.elsevier.comxmlxocsdtd"-xmlns:xs"http:www.w3.org2001XMLSchema"-xmlns:xsi"http:www.w3.org2001XMLSchema-instance"-xmlns"http:www.elsevier.comxmljadtd"-xmlns:ja"http:www.elsevier.comxmljadtd"-xmlns:mml"http:www.w3.org1998MathMathML"-xmlns:tb"http:www.elsevier.comxmlcommontabledtd"-xmlns:sb"http:www.elsevier.comxmlcommonstruct-bibdtd"-xmlns:ce"http:www.elsevier.comxmlcommondtd"-xmlns:xlink"http:www.w3.org1999xlink"-xmlns:cals"http:www.elsevier.comxmlcommoncalsdtd"-xmlns:sa"http:www.elsevier.comxmlcommonstruct-affdtd"greaterlessmml:msubsupgreaterlessmml:mrowgreaterlessmml:migreaterglessmml:migreaterlessmml:mrowgreaterlessmml:mrowgreaterlessmml:mngreater1lessmml:mngreaterlessmml:mrowgreaterlessmml:mrowgreaterlessmml:mi-mathvariant"normal"greaterplessmml:migreaterlessmml:mrowgreaterlessmml:msubsupgreaterlessmml:mathgreater-of-the-proton-and-a-test-of-the-Bjorken-sum-rule){kind=link}