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Measurement of the x- and Q(2)-dependence of the asymmetry A(1) on the nucleon RID A-2074-2012 RID E-8618-2010 RID B-4083-2012

Author:: Dharmawardane, K. V. Kuhn, S. E. Bosted, P. Prok, Y. Adams, G. Ambrozewicz, P. Anghinolfi, M. Asryan, G. Avakian, H. Bagdasaryan, H. Baillie, N. Ball, J. P. 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. Bultmann, S. Burkert, V. D. 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. Crede, V. Cummings, J. P. De Masi, R. DeVita, R. De Sanctis, E. Degtyarenko, P. V. Denizli, H. Dennis, L. Deur, A. Djalali, C. Dodge, G. E. Donnelly, J. Doughty, D. Draigovitsch, 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. Garcon, M. Gavalian, G. Gilfoyle, G. P. Giovanetti, K. L. Girod, F. X. Goetz, J. T. Golovatch, E. Gonenc, A. Gothe, R. W. Griffioen, K. A. Guidal, M. Guillo, M. Guler, N. Guo, L. Gyurjyan, V. Hadjidakis, C. Hafidi, K. Hakobyan, R. S. Hardie, J. Heddle, D. Hersman, F. W. Hicks, K. Hleiqawi, I. Holtrop, M. Huertas, M. Hyde-Wriyht, C. E. Ilieva, Y. Ireland, D. G. Ishkhanov, B. S. Isupov, E. L. Ito, M. M. Jenkins, D. 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. H. Kubarovsky, V. Kuhn, J. Kuleshov, S. V. 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. Mueller, J. Mutchler, G. S. Nadel-Turonski, P. Napolitano, J. Nasseripour, R. Niccolai, S. Niculescu, G. Niculescu, I. Niczyporuk, B. B. Niroula, M. R. Nyazov, 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. Pocanic, 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, B. G. Ronchetti, F. Rosner, G. Rossi, P. Rowntree, D. Rubin, P. D. Sabatie, E. Salgado, C. 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. S. 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.
Journal:: PHYSICS LETTERS B
Issue Date:: 2006
Abstract(summary):: We report results for the virtual photon asymmetry A I on the nucleon from new Jefferson Lab measurements. The experiment, which used the CEBAF Large Acceptance Spectrometer and longitudinally polarized proton ((NH3)-N-15) and deuteron ((ND3)-N-15) targets, collected data with a longitudinally polarized electron beam at energies between 1.6 GeV and 5.7 GeV. In the present. Letter, we concentrate on our results for A(1) (x, Q(2)) and the related ratio g(1)/F-1 (x, Q(2))) in the resonance and the deep inelastic regions for our J west and highest beam energies, covering a range in momentum transfer Q(2) from 0.05 to 5.0 (GeV/c)(2) and in final-state invariant mass W up to about 3 GeV. Our data show detailed structure in the resonance re-ion, which leads to a strong Q(2) dependence of A(1) (x, Q(2)) to. W below 2 GeV. At higher W, a smooth approach to the scaling limit, established by earlier experiments, can be seen, but A I (x, Q(2)) is not strictly Q(2)-independent. We add significantly to the world data set at high x, up to x = 0.6. Our data exceed the SU(6)-symmetric quark model expectation for both the proton and the deuteron while being consistent with a negative d-quark polarization up to our highest x. This data set should improve next-to-leading order (NLO) pQCD fits of the parton polarization distributions. (c) 2006 Elsevier B.V.All rights reserved.
Page:: 11---17

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Measurement of the x- and Q(2)-dependence of the asymmetry A(1) on the nucleon RID A-2074-2012 RID E-8618-2010 RID B-4083-2012

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