Measurement of the proton spin structure function g1(x,Q2) for Q2 from 0.15 to 1.6 GeV2 with CLAS

Fatemi, R. et al. (2003) Measurement of the proton spin structure function g1(x,Q2) for Q2 from 0.15 to 1.6 GeV2 with CLAS. Physical Review Letters, 91(22), (doi:10.1103/PhysRevLett.91.222002)

Fatemi, R. et al. (2003) Measurement of the proton spin structure function g1(x,Q2) for Q2 from 0.15 to 1.6 GeV2 with CLAS. Physical Review Letters, 91(22), (doi:10.1103/PhysRevLett.91.222002)

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Publisher's URL: http://dx.doi.org/10.1103/PhysRevLett.91.222002

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,Q(2)) 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)(Q(2))=integralg(1)(x,Q(2)) 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 Q(2) region. A rapid change in Gamma(1) is observed for Q(2) lt 1 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.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Branford, Prof Derek and Livingston, Dr Kenneth and Protopopescu, Dr Dan and Kellie, Dr James
Authors: Fatemi, R., Skabelin, A.V., Burkert, V.D., Crabb, D., Vita, R.D., 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., De 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., Garcon, 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., Mikhailov, K., 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., Sabatie, 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., and Zhou, Z.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114

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