Measurement of Asymmetry in Spin-Dependent<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>e</mml:mi><mml:mo>−</mml:mo><mml:mi>p</mml:mi></mml:math>Resonance-Region Scattering

Baum, G.; Bergström, M. R.; Clendenin, J. E.; Ehrlich, R.; Hughes, V. W.; Kondo, K.; Lubell, M. S.; Miyashita, S.; Miller, R.H.; Palmer, D. A.; Raith, Wilhelm; Sasao, N.; Schuller, K.; Souder, P. A.

doi:10.1103/physrevlett.45.2000

Cited by 92 publications

(21 citation statements)

References 22 publications

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“…There is a paucity of such data. The SLAC measurements, from the E143 collaboration recently [5] (and from earlier data with larger error bars [12]), do cover W 2 < 5 GeV 2 at Q 2 ≈ 0.5 and 1.2 GeV 2 . These Q 2 are still too low for a duality test, since duality is not working at these Q 2 in the spin-independent case [1,4].…”

mentioning

confidence: 84%

Bloom-Gilman duality in the resonance spin structure functions

Carlson

Mukhopadhyay

1998

Phys. Rev. D

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We investigate the relations between the spin structure functions in the scaling and resonance regions. We examine the possible duality between the two, and draw inferences for the behavior of the asymmetry A 1 at large x. Finally, we point out the importance of additional polarized structure function data in the resonance region for observing lingering effects of single quark interactions in a region where final state interactions are large. ͓S0556-2821͑98͒03521-8͔ PACS number͑s͒: 13.88.ϩe, 12.40.Nn, 13.60.Hb, 14.20.Gk with qϭ(,0,0,͉q ជ ͉).Note that the helicity of the final baryon is PHYSICAL REVIEW D, VOLUME 58, 094029

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confidence: 84%

Bloom-Gilman duality in the resonance spin structure functions

Carlson

Mukhopadhyay

1998

Phys. Rev. D

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“…As we see in fig. 1, the extracted value decreases as one progresses from O(α s /π) to higher orders, but shows good signs of stabilizing in O((α s /π) 4 ). We infer from this analysis a value…”

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confidence: 91%

“…When Bjorken first derived his sum rule for polarized deep-inelastic scattering [1], he doubted whether it could be tested experimentally. Several years later, however, he changed his mind [2] and an experimental programme on polarized electronproton scattering was launched at SLAC [3,4,5] In view of this, a sum rule for the polarized proton and neutron structure function g p 1 was proposed [6], based on the dynamical hypothesis that strange quarks and antiquarks in a polarized nucleon would have no net polarization. However, this sum rule was not at all rigorous, in contrast to the Bjorken sum rule which is an inescapable prediction of QCD [7,8].…”

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confidence: 99%

Determination of αs and the nucleon spin decomposition using recent polarized structure function data

1995

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New data on polarized µ−p and e−p scattering permit a first determination of α s using the Bjorken sum rule, as well as higher precision in determining the nucleon spin decomposition. Using perturbative QCD calculations to O( α s /π) 4 for the non-singlet combination of structure functions, we find α s (2.5 GeV 2 ) = 0.375 +0.062 −0.081 , corresponding to α s (M 2 Z ) = 0.122 +0.005 −0.009 , and using calculations to O( α s /π) 3 for the singlet combination we find ∆u = 0.83 ± 0.03, ∆d = −0.43 ± 0.03, ∆s = −0.10 ± 0.03, ∆Σ ≡ ∆u + ∆d + ∆s = 0.31 ± 0.07, at a renormalization scale Q 2 = 10 GeV 2 . Perturbative QCD corrections play an essential role in reconciling the interpretations of data taken using different targets. We discuss higher-twist uncertainties in these determinations. The ∆q determinations are used to update predictions for the couplings of massive Cold Dark Matter particles and axions to nucleons.

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“…The first data on spin structure functions at low W , including the resonance region, and at moderate Q 2 , were measured at SLAC and published in 1980 [18], followed by more precise data published by the E143 Collaboration in 1996 [19]. A comparable data set to the one presented here, covering a wide kinematic range, was collected for the neutron, using polarized 3 He as an effective neutron target and the spectrometers in Jefferson Laboratory's Hall A [20,21].…”

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confidence: 98%

Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS

Fersch¹,

Guler²,

Bosted³

et al. 2017

Phys. Rev. C

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We present the results of our final analysis of the full data set of g p 1 (Q 2 ), the spin structure function of the proton, collected using CLAS at Jefferson Laboratory in [2000][2001] We compare our final results with various theoretical models and expectations, as well as with parametrizations of the world data. Our data, with their precision and dense kinematic coverage, are able to constrain fits of polarized parton distributions, test pQCD predictions for quark polarizations at large x, offer a better understanding of quark-hadron duality, and provide more precise values of higher twist matrix elements in the framework of the operator product expansion.

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Measurement of Asymmetry in Spin-Dependente−pResonance-Region Scattering

Cited by 92 publications

References 22 publications

Bloom-Gilman duality in the resonance spin structure functions

Bloom-Gilman duality in the resonance spin structure functions

Determination of αs and the nucleon spin decomposition using recent polarized structure function data

Determination of the proton spin structure functions for 0.05<Q2<5GeV2 using CLAS

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