Measurement of the x- and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mi>Q</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:math>-dependence of the asymmetry <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.gif" overflow="scroll"><mml:msub><mml:mi>A</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math> on the nucleon

Dharmawardane, K. V.; Kuhn, S. E.; Bosted, P.; Prok, Y.; Adams, G. S.; Ambrozewicz, P.; Anghinolfi, M.; Asryan, G.; Avakian, H.; Bagdasaryan, H.; Baillie, N.; Ball, J.; Baltzell, N. A.; Barrow, S.; Batourine, V.; Battaglieri, M.; Beard, K.; Bedlinskiy, I.; Bektasoglu, M.; Bellis, M.; Benmouna, N.; Biselli, A. S.; Bonner, B. E.; Bouchigny, S.; Boiarinov, S.; Bradford, R.; Branford, D.; Brooks, W. K.; Bültmann, S.; Burkert, Volker; Butuceanu, C.; Calarco, J. R.; Careccia, S. L.; Carman, D. S.; Carnahan, B.; Cazes, A.; Chen, S.; Cole, P. L.; Collins, P.; Coltharp, P.; Cords, D.; Corvisiero, P.; Crabb, D.; Crannell, H.; Credé, V.; Cummings, J. P.; Masi, R. De; DeVita, R.; Sanctis, E. De; Degtyarenko, P. V.; Denizli, H.; Dennis, L.; Deur, A.; Djalali, C.; Dodge, G. E.; Donnelly, J.; Doughty, D.; Dragovitsch, P.; Dugger, M.; Dytman, S.; Dzyubak, O. P.; Egiyan, H.; Egiyan, K. S.; Elouadrhiri, L.; Eugenio, P.; Fatemi, R.; Fedotov, G.; Feuerbach, R. J.; Forest, T. A.; Funsten, H. O.; Garçon, M.; Gavalian, G.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Golovatch, E.; Gönenç, A.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guillo, M.; Guler, N.; Guo, L.; Gyurjyan, V.; Hadjidakis, C.; Hafidi, K.; Hakobyan, R.; Hardie, J.; Heddle, D.; Hersman, F. W.; Hicks, K.; Hleiqawi, I.; Holtrop, M.; Huertas, M.; Hyde‐Wright, C. E.; Ilieva, Y.; Ireland, D. G.; Ишханов, Б. С.; Isupov, E. L.; Ito, M. M.; Jenkins, David; Jo, H. S.; Joo, K.; Juengst, H. G.; Keith, C.; Kellie, J. D.; Khandaker, M.; Kim, K. Y.; Kim, K.; Kim, W.; Klein, A.; Klein, F. J.; Klusman, M.; Kossov, M.; Kramer, L.; Kubarovsky, V.; Kühn, J.; Kuleshov, S.; Lachniet, J.; Laget, J. M.; Langheinrich, J.; Lawrence, D.; Li, Ji; Lima, A. C S; Livingston, K.; Lu, H.; Lukashin, K.; MacCormick, M.; Manak, J. J.; Markov, N.; McAleer, S.; McKinnon, B.; McNabb, J. W. C.; Mecking, B. A.; Mestayer, M. D.; Meyer, C. A.; Mibe, T.; Mikhailov, K.; Minehart, R.; Mirazita, M.; Miskimen, R.; Mokeev, V.; Morand, L.; Morrow, S. A.; Moteabbed, M.; Muêller, J.; Mutchler, G. S.; Nadel-Turoński, P.; Napolitano, J.; Nasseripour, R.; Niccolai, S.; Niculescu, G.; Niculescu, I.; Niczyporuk, B. B.; Niroula, M. R.; Niyazov, R. A.; Nozar, M.; O’Rielly, G. V.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Paterson, C.; Philips, S. A.; Pierce, J.; Pivnyuk, N.; Počanić, D.; Pogorelko, O.; Polli, E.; Pozdniakov, S.; Preedom, B. M.; Price, J. W.; Protopopescu, D.; Qin, L. M.; Raue, B. A.; Riccardi, G.; Ricco, G.; Ripani, M.; Ritchie, Barry; Ronchetti, F.; Rosner, G.; Rossi, P.; Rowntree, D.; Rubin, P. D.; Sabatié, F.; Salgado, Carlos A.; Santoro, J. P.; Sapunenko, V.; Schumacher, R. A.; Serov, V. S.; Sharabian, Y. G.; Shaw, J.; Shvedunov, N. V.; Skabelin, A. V.; Smith, E. S.; Smith, L. C.; Sober, D. I.; Stavinsky, A.; Stepanyan, S.; Stokes, B. E.; Stoler, P.; Strakovsky, I. I.; Strauch, S.; Suleiman, R.; Taiuti, M.; Taylor, S.; Tedeschi, D. J.; Thoma, U.; Thompson, R.; Tkabladze, A.; Tkachenko, S.; Todor, L.; Tur, C.; Ungaro, M.; Vineyard, M. F.; Vlassov, A. V.; Weinstein, L. B.; Weygand, D. P.; Williams, M.; Wolin, E.; Wood, M. H.; Yegneswaran, A.; Yun, J.; Zana, L.; Zhang, J.; Zhao, B.; Zhao, Z. W.

doi:10.1016/j.physletb.2006.08.011

Cited by 119 publications

(82 citation statements)

References 335 publications

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“…In this section we will discuss how inclusion of the CLAS proton and deuteron g 1 /F 1 data [5] and the new COMPASS data on A d 1 [6] influence our previous results [3] on polarized PD and higher twist obtained from the NLO QCD fit to the world data [1,13,14], before the CLAS and the latest COMPASS data were available.…”

Section: Results Of Analysismentioning

confidence: 99%

“…In this paper we study the impact of the recent very precise CLAS [5] and COMPASS [6] inclusive polarized DIS data on the determination of both the longitudinal polarized parton densities (PPD) in the nucleon and the higher twist (HT) effects. These experiments give important information about the nucleon structure in quite different kinematic regions.…”

Section: Introductionmentioning

confidence: 99%

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Impact of CLAS and COMPASS data on polarized parton densities and higher twist

2007

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We have re-analyzed the world data on inclusive polarized DIS including the very precise CLAS proton and deuteron data, as well as the latest COMPASS data on the asymmetry A d 1 , and have studied the impact of these data on polarized parton densities and higher twist effects. We demonstrate that the low Q 2 CLAS data improve essentially our knowledge of higher twist corrections to the spin structure function g1, while the large Q 2 COMPASS data influence mainly the strange quark density. In our new analysis we find that a negative polarized gluon density, or one that changes sign as a function of x, cannot be ruled out on the basis of the present DIS data.

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Section: Results Of Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of CLAS and COMPASS data on polarized parton densities and higher twist

2007

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“…Over the 20 years since the European Muon Collaboration (EMC) reported that most of the nucleon spin was not carried as the spin of its quarks and antiquarks [3], there has been tremendous progress in unravelling this mystery. It is now known that the missing spin fraction is of order 2=3 [4,5], rather than 90%, and furthermore, the contribution from polarized gluons is less than 5% (corresponding to jÁGj < 0:3 [6][7][8][9][10][11]). It was recently shown by Myhrer and Thomas [12] that the modern spin discrepancy can be rather well explained in terms of standard features of the nonperturbative structure of the nucleon, namely, relativistic motion of the valence quarks [13], the pion cloud required by chiral symmetry [14] and an exchange current contribution associated with the one-gluon-exchange hyperfine interaction [15].…”

Section: Interplay Of Spin and Orbital Angular Momentum In The Protonmentioning

confidence: 99%

Interplay of Spin and Orbital Angular Momentum in the Proton

2008

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“…As an application and a test of our result, we compare our extraction of g 1 (x, Q 2 ) to CLAS data [8], which have not been used in the fit. In Figure 1 we show the kinematic range spanned by the data used in the fit (see also Table 1) together with the bin of CLAS data against which we want to check our parametrisation.…”

Section: Resultsmentioning

confidence: 99%