1. Measurement of the proton spin structure function $g_1(x,Q^2)$ for $Q2$ from 0.15 to 1.6 GeV$^2$ with CLAS
- Author
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Fatemi, R., Skabelin, A. V., Burkert, V. D., Crabb, D., Vita, R., Kuhn, S. E., Minehart, R., Adams, G., Anciant, E., Anghinolfi, M., Asavapibhop, B., Audit, G., Auger, T., Avakian, H., Bagdasaryan, H., Ball, J. P., Barrow, S., Battaglieri, M., Beard, K., Bektasoglu, M., Bellis, M., Bertozzi, W., Bianchi, N., Biselli, A. S., Boiarinov, S., Bonner, B. E., Bosted, P. E., Bouchigny, S., Bradford, R., Branford, D., Brooks, W. K., Butuceanu, C., Calarco, J. R., Carman, D. S., Carnahan, B., Cetina, C., Ciciani, L., Clark, R., Cole, P. L., Coleman, A., Connelly, J., Cords, D., Corvisiero, P., Crannell, H., Cummings, J. P., Sanctis, E., Degtyarenko, P. V., Denizli, H., Dennis, L., Dharmawardane, K. V., Dhuga, K. S., Djalali, C., Dodge, G. E., Doughty, D., Dragovitsch, P., Dugger, M., Dytman, S., Eckhause, M., Egiyan, H., Egiyan, K. S., Elouadrhiri, L., Empl, A., Eugenio, P., Farhi, L., Feuerbach, R. J., Freyberger, A., Ficenec, J., Forest, T. A., Frolov, V., Funsten, H., Gaff, S. J., Garçon, M., Gavalian, G., Gilad, S., Gilfoyle, G. P., Giovanetti, K. L., Girard, P., Gordon, C. I. O., Griffioen, K. A., Guidal, M., Guillo, M., Guo, L., Gyurjyan, V., Hadjidakis, C., Hancock, D., Hardie, J., Heddle, D., Heimberg, P., Hersman, F. W., Hicks, K., Hicks, R. S., Holtrop, M., Hu, J., Hyde-Wright, C. E., Ilieva, Y., Ito, M. M., Jenkins, D., Joo, K., Keith, C., Kelley, J. H., Kellie, J. D., Khandaker, M., Kim, K. Y., Kim, K., Kim, W., Klein, A., Klein, F. J., Klimenko, A. V., Klusman, M., Kossov, M., Koubarovski, V., Kramer, L. H., Kuang, Y., Kuhn, J., Lachniet, J., Laget, J. M., Lawrence, D., Li, J., Livingston, K., Longhi, A., Lukashin, K., Major, W., Manak, J. J., Marchand, C., Mcaleer, S., Mcnabb, J. W. C., Mecking, B. A., Mehrabyan, S., Mestayer, M. D., Meyer, C. A., Mikhail Osipenko, Mirazita, M., Miskimen, R., Morand, L., Morrow, S. A., Muccifora, V., Mueller, J., Mutchler, G. S., Napolitano, J., Nasseripour, R., Nelson, S. O., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B. B., Niyazov, R. A., Nozar, M., O Brien, J. T., O Rielly, G. V., Osipenko, M., Park, K., Pasyuk, E., Peterson, G., Pivnyuk, N., Pocanic, D., Pogorelko, O., Polli, E., Pozdniakov, S., Preedom, B. M., Price, J. W., Prok, Y., Protopopescu, D., Qin, L. M., Raue, B. A., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B. G., Rock, S. E., Ronchetti, F., Rossi, P., Rowntree, D., Rubin, P. D., Sabatié, F., Sabourov, K., Salgado, C., Santoro, J. P., Sapunenko, V., Sargsyan, M., Schumacher, R. A., Seely, M., Serov, V. S., Sharabian, Y. G., Shaw, J., Simionatto, S., Smith, E. S., Smith, T., Smith, L. C., Sober, D. I., Sorrel, L., Spraker, M., Stavinsky, A., Stepanyan, S., Stoler, P., Strauch, S., Taiuti, M., Taylor, S., Tedeschi, D. J., Thoma, U., Thompson, R., Todor, L., Tur, C., Ungaro, M., Vineyard, M. F., Vlassov, A. V., Wang, K., Weinstein, L. B., Weller, H., Weygand, D. P., Whisnant, C. S., Wolin, E., Wood, M. H., Yegneswaran, A., Yun, J., Zhang, B., Zhao, J., Zhou, Z., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and CLAS
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[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] - Abstract
Double-polarization asymmetries for inclusive ep scattering were measured at Jefferson Lab using 2.6 and 4.3 GeV longitudinally polarized electrons incident on a longitudinally polarized NH3 target in the CLAS detector. The polarized structure function g(1)(x,Q2) was extracted throughout the nucleon resonance region and into the deep inelastic regime, for Q(2)=0.15-1.64 GeV2. The contributions to the first moment Gamma(1)(Q2)= integral g(1)(x,Q2) dx were determined up to Q(2)=1.2 GeV2. Using a parametrization for g(1) in the unmeasured low x regions, the complete first moment was estimated over this Q2 region. A rapid change in Gamma(1) is observed for Q21 GeV2, with a sign change near Q(2)=0.3 GeV2, indicating dominant contributions from the resonance region. At Q(2)=1.2 GeV2 our data are below the perturbative QCD evolved scaling value.
- Published
- 2003