Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2

Anthony, P.L.; Arnold, R. G.; Averett, T.; Band, H. R.; Benmouna, N.; Boeglin, W.; Borel, H.; Bosted, P.; Bültmann, S.; Court, G.R.; Crabb, D.; Day, D.; Decowski, P.; DePietro, P.; Egiyan, H.; Erbacher, R.; Erickson, R.; Fatemi, R.; Frlež, E.; Griffioen, K. A.; Harris, Carl M.; Hughes, E. W.; Hyde‐Wright, C. E.; Igo, G.; Johnson, J. R.; P, King; Kramer, K.; Kuhn, S. E.; Lawrence, D.; Liang, Y.; Lindgren, R.; Lombard-Nelsen, R. M.; McKee, P.; McNulty, D.; Meyer, W.; Mitchell, G. S.; Mitchell, J.; Olson, M.; Penttilä, S. I.; Peterson, G. A.; Pitthan, R.; Počanić, D.; Prepost, R.; Prescott, C.Y.; Raue, B. A.; Reyna, D.; Ryan, P.; Rochester, L.S.; Rock, S. E.; Rondon-Aramayo, O.; Sabatié, F.; Smith, T. B.; Sorrell, L.; Lorant, S. St.; Szalata, Z. M.; Terrien, Y.; Tobías, Aurelio; Toole, T.; Trentalange, S.; Wesselmann, F. R.; Wright, T.; Zeier, M.; Zhu, Haibin; Zihlmann, B.

doi:10.1016/s0370-2693(02)03015-0

Cited by 172 publications

(154 citation statements)

References 48 publications

(65 reference statements)

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“…By extracting the coefficients of the 1=Q 2 corrections from the data one can thus obtain information about the structure of the nucleon in QCD. The SLAC E155X experiment [8] and the Jefferson Lab Hall A experiment [9] have extracted the twist-3 matrix elements from combined measurements of the structure functions g 1 and g 2 , and found surprisingly small values, d 2 & 10 ÿ2 . Recent analyses have also attempted to extract the twist-4 matrix element, f 2 , from the power corrections to the first moment of g 1 [10 -13]; see Ref.…”

Section: Introductionmentioning

confidence: 99%

Higher twists in polarized DIS and the size of the constituent quark

Сидоров

Weiß

2006

Phys. Rev. D

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The spontaneous breaking of chiral symmetry implies the presence of a short-distance scale in the QCD vacuum, which phenomenologically may be associated with the size of the constituent quark, 0:3 fm. We discuss the role of this scale in the matrix elements of the twist-4 and 3 quark-gluon operators determining the leading power (1=Q 2 )-corrections to the moments of the nucleon spin structure functions. We argue that the flavor-nonsinglet twist-4 matrix element, f uÿd 2 , has a sizable negative value of the order ÿ2 , due to the presence of sea quarks with virtualities ÿ2 in the proton wave function. The twist-3 matrix element, d 2 , is not related to the scale ÿ2 . Our arguments support the results of previous calculations of the matrix elements in the instanton vacuum model. We show that this qualitative picture is in agreement with the phenomenological higher-twist correction extracted from an NLO QCD fit to the world data on g p 1 and g n 1 , which include recent data from the Jefferson Lab Hall A and COMPASS experiments. We comment on the implications of the short-distance scale for quark-hadron duality and the x-dependence of higher-twist contributions.

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Section: Introductionmentioning

confidence: 99%

Higher twists in polarized DIS and the size of the constituent quark

Сидоров

Weiß

2006

Phys. Rev. D

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“…Therefore, the presence of higher twist contributions can be concluded from the sum rule violation [51]. In Table VI, our result for this sum rule at Q 2 = 5 GeV 2 is compared with experimental results [35,50,51]. Any conclusion relies on the behavior of g 2 at low x, which is not accurately known up to now.…”

Section: B Burkhardt-cottingham Sum Rulementioning

confidence: 79%

“…We use a wide range of polarized deep-inelastic scattering lepton-nucleon data on spin structure functions g 1 [2,[35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] and g 2 [2,35,45,[48][49][50][51][52], which are extracted based on the different nucleon targets of protons, neutrons, and deuterons to extract all PPDFs.…”

Section: B Overview Of Data Setsmentioning

confidence: 99%

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Target mass corrections and higher twist effects in polarized deep-inelastic scattering

2014

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We perform a next-to-leading-order QCD analysis to world data on polarized structure functions g1 and g2 in a fixed-flavor number scheme. We include target mass corrections and higher twist effects in our fitting procedure and study their non-negligible effects on physically interesting quantities. Twist-3 contributions to both polarized structure functions are determined, and the accuracy of the extracted polarized parton distribution functions is improved. 3 He and 3 H polarized structure functions are described based on our fit result. Moreover, sum rules are derived and compared with available theoretical and experimental results.

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“…The η factor is always small within the COMPASS kinematic, moreover A 2 has been found to be small [3], thus the ηA 2 term is neglected. Hence A p 1 and g p 1 are expressed as :…”

Section: Spin Asymmetrymentioning

confidence: 99%

New COMPASS results on the proton spin-dependent structure function $g_1^p$

Andrieux¹

2013

Proceedings of XXI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS 2013)

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Recent COMPASS results on the spin asymmetry A 1 and the spin-dependent structure function of the proton g p 1 as a function of x B j and Q 2 are presented. The data have been recorded with a polarised muon beam at 200 GeV scattered off a polarised NH 3 target. The high energy of the beam allows for A 1 measurements down to x B j = 0.0036 for the first time and extends the Q 2 range to higher values, which brings new inputs for QCD global fits of world data.

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Precision measurement of the proton and deuteron spin structure functions g2 and asymmetries A2

Cited by 172 publications

References 48 publications

Higher twists in polarized DIS and the size of the constituent quark

Higher twists in polarized DIS and the size of the constituent quark

Target mass corrections and higher twist effects in polarized deep-inelastic scattering

New COMPASS results on the proton spin-dependent structure function $g_1^p$

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