Measurement of the neutron spin structure function g and asymmetry A

K, Abe; Akagi, T.; Anderson, B. D.; Anthony, P.L.; Arnold, R. G.; Averett, T.; Band, H. R.; Berisso, C.M.; Bogorad, P.; Borel, H.; Bosted, P.; Breton, Vincent; Buénerd, M.; Cates, G. D.; Chupp, T. E.; Churchwell, S.; Coulter, K. P.; Daoudi, M.; Decowski, P.; Erickson, R.; Fellbaum, J.; Fonvieille, H.; Gearhart, R.; Ghazikhanian, V.; Griffioen, K. A.; Hicks, R. S.; Holmes, R.; Hughes, E. W.; Igo, G.; Incerti, S.; Johnson, J. R.; Kahl, W.; Khayat, M.; Kolomensky, Yu. G.; Kuhn, S. E.; Kumar, Krishna; Kuriki, M.; Lombard-Nelsen, R. M.; Manley, D. M.; Marroncle, J.; Maruyama, Takashi; Marvin, T.; Meyer, W.; Meziani, Z. E.; Miller, Donald H.; Mitchell, G. S.; Olson, M.; Peterson, G. A.; Petratos, G. G.; Pitthan, R.; Prepost, R.; Raines, P.; Raue, B. A.; Reyna, D.; Rochester, L.S.; Rock, S. E.; Romalis, M. V.; Sabatié, F.; Shapiro, G.; Shaw, J.; Smith, T. B.; Sorrell, L.; Souder, P. A.; Staley, F.; Lorant, S. St.; Stuart, L. M.; Suckane, F.; Szalata, Z. M.; Terrien, Y.; Thompson, A. K.; Toole, T.; Wang, X.; Watson, J. W.; Welsh, Robert C.; Wesselmann, F. R.; Wright, T.; Young, C.; Youngman, B.; Yuta, H.; Zhang, W.-M.; Żyla, P.

doi:10.1016/s0370-2693(97)00613-8

Cited by 79 publications

(32 citation statements)

References 36 publications

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“…The experimental studies at SLAC [1,2,3] have confirmed theoretical expectations about the shape of g 2 (x, Q 2 ) and provided first evidence on the most interesting twist-3 contribution. On the theoretical side, a lot of effort was invested to understand the physical interpretation of twist-3 distributions (see e.g.…”

Section: Introductionmentioning

confidence: 69%

Gluon contribution to the structure function

2001

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Abstract:We calculate the one-loop twist-3 gluon contribution to the flavor-singlet structure function g 2 (x, Q 2 ) in polarized deep-inelastic scattering and find that it is dominated by the contribution of the three-gluon operator with the lowest anomalous dimension (for each moment N). The similar property was observed earlier for the nonsinglet distributions, although the reason is in our case different. The result is encouraging and suggests a simple evolution pattern of g 2 (x, Q 2 ) in analogy with the conventional description of twist-2 parton distributions.

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Section: Introductionmentioning

confidence: 69%

Gluon contribution to the structure function

2001

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“…The proton asymmetries were fit first, followed by a fit to the neutron A 1 and A 2 . For this second part, we used the rich data set collected on 3 He at Jefferson Lab (Hall A) [11,12,88,91,92], SLAC [93][94][95][96], and HERMES [18,97], as well as the world data on the deuteron, including our own. The goodness of the fit (χ 2 ) was calculated by comparing the fit functions for neutron asymmetries directly with neutron results extracted from 3 He data, as well as comparing the convolu- tion of our proton and neutron models with corresponding deuteron data.…”

Section: Modelsmentioning

confidence: 99%

Precise determination of the deuteron spin structure at low to moderateQ2with CLAS and extraction of the neutron contribution

Guler¹,

Fersch²,

Kuhn³

et al. 2015

Phys. Rev. C

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Precise determination of the deuteron spin structure at low to moderate Q^{2} with CLAS and extraction of the neutron contribution We present the final results for the deuteron spin structure functions obtained from the full data set collected with Jefferson Lab's CLAS in 2000-2001. Polarized electrons with energies of 1.6, 2.5, 4.2 and 5.8 GeV were scattered from deuteron ( 15 ND3) targets, dynamically polarized along the beam direction, and detected with CLAS. From the measured double spin asymmetry, the virtual photon absorption asymmetry A d 1 and the polarized structure function g d 1 were extracted over a wide kinematic range (0.05 GeV 2 < Q 2 < 5 GeV 2 and 0.9 GeV < W < 3 GeV). We use an unfolding procedure and a parametrization of the corresponding proton results to extract from these data the polarized structure functions A n 1 and g n 1 of the (bound) neutron, which are so far unknown in the resonance region, W < 2 GeV. We compare our final results, including several moments of the deuteron and neutron spin structure functions, with various theoretical models and expectations as well as parametrizations of the world data. The unprecedented precision and dense kinematic coverage of these data can aid in future extractions of polarized parton distributions, tests of perturbative QCD predictions for the quark polarization at large x, a better understanding of quark-hadron duality, and more precise values for higher-twist matrix elements in the framework of the Operator Product Expansion.

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“…Moreover, g 2 contains nonperturative higher twist (HT) contributions, such as quark-quark and quark-gluon correlations and quark mass effects, which are not interpreted in QPM. Operator Product Expansion (OPE) based on QCD is an appropriate formalism that is applicable to interpret g 2 structure function [1,2].…”

Section: Introductionmentioning

confidence: 99%

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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Measurement of the neutron spin structure function g and asymmetry A

Cited by 79 publications

References 36 publications

Gluon contribution to the structure function

Gluon contribution to the structure function

Precise determination of the deuteron spin structure at low to moderateQ2with CLAS and extraction of the neutron contribution

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

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