Precision measurements of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>g</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math>of the proton and of the deuteron with 6 GeV electrons

Prok, Y.; Bosted, P.; Kvaltine, N. D.; Adhikari, K. P.; Adikaram, D.; Aghasyan, M.; Amaryan, M. J.; Anderson, M.; Pereira, S. Anefalos; Avakian, H.; Baghdasaryan, H.; Ball, J.; Baltzell, N. A.; Battaglieri, M.; Biselli, A. S.; Bono, J.; Briscoe, W. J.; Brock, J.; Brooks, W. K.; Bültmann, S.; Burkert, Volker; Carlin, C.; Carman, D. S.; Celentano, A.; Chandavar, S.; Colaneri, L.; Cole, P. L.; Contalbrigo, M.; Cortes, O.; Crabb, D.; Credé, V.; D’Angelo, A.; Dashyan, N.; Vita, R. De; Sanctis, E. De; Deur, A.; Djalali, C.; Dodge, G. E.; Doughty, D.; Dupré, R.; Alaoui, A. El; Fassi, L. El; Elouadrhiri, L.; Fedotov, G.; Fegan, S.; Fersch, R.; Fleming, J. A.; Forest, T. A.; Garçon, M.; Garillon, B.; Gevorgyan, N.; Ghandilyan, Y.; Gilfoyle, G. P.; Girod, F. X.; Giovanetti, K. L.; Goetz, J. T.; Gohn, W.; Gothe, R. W.; Griffioen, K. A.; Guegan, Baptiste; Guler, N.; Hafidi, K.; Hanretty, C.; Harrison, N.; Hattawy, M.; Hicks, K.; Ho, D.; Holtrop, M.; Ilieva, Y.; Ireland, D. G.; Ишханов, Б. С.; Isupov, E. L.; Jawalkar, S. S.; Jiang, X.; Jo, H. S.; Joo, K. S.; Kalantarians, N.; Keith, C.; Keller, D.; Khandaker, M.; Kim, A.; Kim, W.; Klein, A.; Klein, F. J.; Koirala, S.; Kubarovsky, V.; Kuhn, S. E.; Kuleshov, S. V.; Lenisa, P.; Livingston, K.; Lu, H.; MacGregor, I. J. D.; Markov, N.; Mayer, M.; McKinnon, B.; Meekins, D.; Mineeva, T.; Mirazita, M.; Mokeev, V.; Montgomery, R. A.; Moutarde, H.; Movsisyan, A.; Munévar, E.; Camacho, C. Muñoz; Nadel-Turoński, P.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Osipenko, M.; Ostrovidov, A. I.; Pappalardo, L. L.; Paremuzyan, R.; Park, K.; Peng, P.; Phillips, J. J.; Pierce, J.; Pisano, S.; Pogorelko, O.; Pozdniakov, S.; Price, J. W.; Procureur, S.; Protopopescu, D.; Puckett, A. J. R.; Raue, B. A.; Rimal, D.; Ripani, M.; Rizzo, A.; Rosner, G.; Rossi, P.; Roy, P.; Sabatié, F.; Saini, M. S.; Salgado, Carlos A.; Schott, D.; Schumacher, R. A.; Seder, E.; Sharabian, Y. G.; Simonyan, A.; Smith, C.; Smith, G. D.; Sober, D. I.; Sokhan, D.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Sytnik, V.; Taiuti, M.; Tang, W.; Tkachenko, S.; Ungaro, M.; Vernarsky, B.; Vlassov, A. V.; Voskanyan, H.; Voutier, E.; Walford, N. K.; Watts, D. P.; Weinstein, L. B.; Zachariou, N.; Zana, L.; Zhang, J.; Zhao, B.; Zhao, Z. W.; Zonta, I.

doi:10.1103/physrevc.90.025212

Cited by 48 publications

(51 citation statements)

References 43 publications

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“…Therefore, it looks more natural to first fit the truncated OPE expression (10), with pQCD and (3δ and 2δ) AQCD, to the BSR experimental results [2-4, 6, 7] which are obtained for the inelastic contribution; and after such a fit, add the elastic contribution (11) [with the parametrization (12)-(13b)]. We note that the theoretical expression obtained for the total BSR in this way is the sum of the expressions (10) and (11), which is again an OPE expression as it should be for such an inclusive spacelike observable as the total BSR.…”

Section: Elastic Contributionmentioning

confidence: 99%

“…Further, high quality experimental results for this quantity, obtained in polarized deep inelastic scattering (DIS), are now available in a large range of spacelike squared momenta −q 2 ≡ Q 2 : 0.054 GeV 2 ≤ Q 2 < 5 GeV 2 [2][3][4][5][6][7][8][9][10]. In particular, the newer experimental results [4] with highly reduced statistical uncertainties, extracted mainly from the Jefferson Lab CLAS EG1-DVCS experiment [11] taken on polarized targets made of protons and deuterons, render BSR an attractive quantity to test on it various extensions of pQCD to low Q 2 1 GeV 2 .…”

Section: Introductionmentioning

confidence: 99%

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Bjorken polarized sum rule and infrared-safe QCD couplings

et al. 2018

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Experimental data obtained for the polarized Bjorken sum rule (BSR) Γ p−n 1 (Q 2 ) are fitted by using predictions derived within a truncated operator product expansion (OPE) approach to QCD. Four QCD versions are considered: perturbative QCD (pQCD) in the MS scheme, Analytic Perturbation Theory (APT), and 2δ and 3δ analytic QCD versions. In contrast to pQCD, these QCD variants do not have Landau singularities at low positive Q 2 , which facilitates the fitting procedure significantly. The fitting procedure is applied first to the experimental data of the inelastic part of BSR, and the known elastic contributions are added after the fitting. In general, when 2δ and 3δ QCD coupling is used the fitted curves give the best results, within the Q 2 -range of the fit as well as in extended Q 2intervals. When the fitting procedure is applied to the total BSR, i.e., to the sum of the experimental data and the elastic contribution, the quality of the results deteriorates significantly.

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Section: Elastic Contributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bjorken polarized sum rule and infrared-safe QCD couplings

et al. 2018

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“…Further information will come from the analysis of the completed EG4 experiment with CLAS, which extends the kinematic coverage of the present data set to even lower Q 2 for a more rigorous test of χ PT. At the highest values of Q 2 , spin structure function data from the EG1-dvcs experiment [23] have improved our knowledge of A p 1 at large x and further reduced the uncertainty with which g p 1 is known in the DIS region. Finally, additional information on the structure functions g p 2 and A p 2 is forthcoming from "SANE" in Hall C [49] and "g2p" in Hall A [145].…”

Section: Modelsmentioning

confidence: 99%

“…The data set analyzed comprised all the energies used for the EG1b analysis and the doubly polarized data from other JLab experiments (EG1a [12] and EG1-dvcs [23]) as well as the data from the SLAC, CERN, and DESY facilities, including the recent COMPASS results [46]. The low-x extrapolation of world data was redone using our model (see Sec.…”

Section: Higher Twist Analysismentioning

confidence: 99%

“…A more restricted data set on the proton and deuteron at an average Q 2 of 1.3 GeV 2 , covering the resonance region with both transversely and longitudinally polarized targets, was acquired in Jefferson Lab's Hall C [22]. Precise g p 1 and g d 1 data from the CLAS EG1-dvcs experiment were published recently [23]. These results provided measurements of these structure functions at Q 2 > 1 GeV 2 , giving results at higher x than accessible in EG1b; results from EG1b in this publication complement these results by improving the precision of g p 1 at lower Q 2 in and near the resonance region.…”

Section: Introductionmentioning

confidence: 99%

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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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Deep inelastic scattering from polarized spin-1/2 hadrons at low x from string theory

Kovensky

Michalski

Schvellinger

2018

J. High Energ. Phys.

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We study polarized deep inelastic scattering of charged leptons from spin-1/2 hadrons at low values of the Bjorken parameter and large 't Hooft coupling in terms of the gauge/string theory duality. We calculate the structure functions from type IIB superstring theory scattering amplitudes. We discuss the role of the non-Abelian Chern-Simons term and the Pauli term from the five-dimensional SU(4) gauged supergravity. Furthermore, the exponentially small-x regime where Regge physics becomes important is analyzed in detail for the antisymmetric structure functions. In this case the holographic dual picture of the Pomeron exchange is realized by a Reggeized gauge field. We compare our results with experimental data of the proton antisymmetric structure function g 1 , obtaining a very good level of agreement.

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Precision measurements ofg1of the proton and of the deuteron with 6 GeV electrons

Cited by 48 publications

References 43 publications

Bjorken polarized sum rule and infrared-safe QCD couplings

Bjorken polarized sum rule and infrared-safe QCD couplings

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

Deep inelastic scattering from polarized spin-1/2 hadrons at low x from string theory

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