The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering

We present a new measurement of the virtual photon proton asymmetry Ap1 from deep inelastic scattering of polarized muons on polarized protons in the kinematic range 0.0008 < x < 0.7 and 0.2 < Q2 < 100 GeV2. With this, the statistical uncertainty of our measurement has im...

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Autor principal:	Adeva, B.
Formato:	JOUR
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_03702693_v412_n3-4_p414_Adeva
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_03702693_v412_n3-4_p414_Adeva
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spelling	todo:paper_03702693_v412_n3-4_p414_Adeva2023-10-03T15:28:47Z The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering Adeva, B. We present a new measurement of the virtual photon proton asymmetry Ap1 from deep inelastic scattering of polarized muons on polarized protons in the kinematic range 0.0008 < x < 0.7 and 0.2 < Q2 < 100 GeV2. With this, the statistical uncertainty of our measurement has improved by a factor of 2 compared to our previous measurements. The spin-dependent structure function gp1 is determined for the data with Q2 > 1 GeV2. A perturbative QCD evolution in next-to-leading order is used to determine gp1(x) at a constant Q2. At Q2 = 10 GeV2 we find, in the measured range, ∫0.70.003 gp1(x)d x = 0.139 ± 0.006(stat) ± 0.008(syst) ± 0.006 (evol). The value of the first moment Γp1 = ∫10gp1(x)dx of gp1 depends on the approach used to describe the behaviour of gp1 at low x. We find that the Ellis-Jaffe sum rule is violated. With our published result for Γd1 we confirm the Bjorken sum rule with an accuracy of ≈ 15% at the one standard deviation level. © 1997 Elsevier Science B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03702693_v412_n3-4_p414_Adeva
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description	We present a new measurement of the virtual photon proton asymmetry Ap1 from deep inelastic scattering of polarized muons on polarized protons in the kinematic range 0.0008 < x < 0.7 and 0.2 < Q2 < 100 GeV2. With this, the statistical uncertainty of our measurement has improved by a factor of 2 compared to our previous measurements. The spin-dependent structure function gp1 is determined for the data with Q2 > 1 GeV2. A perturbative QCD evolution in next-to-leading order is used to determine gp1(x) at a constant Q2. At Q2 = 10 GeV2 we find, in the measured range, ∫0.70.003 gp1(x)d x = 0.139 ± 0.006(stat) ± 0.008(syst) ± 0.006 (evol). The value of the first moment Γp1 = ∫10gp1(x)dx of gp1 depends on the approach used to describe the behaviour of gp1 at low x. We find that the Ellis-Jaffe sum rule is violated. With our published result for Γd1 we confirm the Bjorken sum rule with an accuracy of ≈ 15% at the one standard deviation level. © 1997 Elsevier Science B.V.
format	JOUR
author	Adeva, B.
spellingShingle	Adeva, B. The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering
author_facet	Adeva, B.
author_sort	Adeva, B.
title	The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering
title_short	The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering
title_full	The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering
title_fullStr	The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering
title_full_unstemmed	The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering
title_sort	spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering
url	http://hdl.handle.net/20.500.12110/paper_03702693_v412_n3-4_p414_Adeva
work_keys_str_mv	AT adevab thespindependentstructurefunctiong1xoftheprotonfrompolarizeddeepinelasticmuonscattering AT adevab spindependentstructurefunctiong1xoftheprotonfrompolarizeddeepinelasticmuonscattering
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The spin-dependent structure function g1(x) of the proton from polarized deep-inelastic muon scattering

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