Moments of the spin structure functions gp1 and gd1 for 0.05<Q2<3.0 GeV2

Prok, Y. et al. (2009) Moments of the spin structure functions gp1 and gd1 for 0.05<Q2<3.0 GeV2. Physics Letters B, 672(1), pp. 12-16. (doi:10.1016/j.physletb.2008.12.063)

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Abstract

The spin structure functions g<sub>1</sub> for the proton and the deuteron have been measured over a wide kinematic range in x and Q<sup>2</sup> using 1.6 and 5.7 GeV longitudinally polarized electrons incident upon polarized NH<sub>3</sub> and ND<sub>3</sub> targets at Jefferson Lab. Scattered electrons were detected in the CEBAF Large Acceptance Spectrometer, for 0.05<Q<sup>2</sup><5 GeV<sup>2</sup> and W<3 GeV. The first moments of g<sub>1</sub> for the proton and deuteron are presented – both have a negative slope at low Q<sup>2</sup>, as predicted by the extended Gerasimov–Drell–Hearn sum rule. The first extraction of the generalized forward spin polarizability of the proton γ<sup>p0</sup> is also reported. This quantity shows strong Q<sup>2</sup> dependence at low Q<sup>2</sup>. Our analysis of the Q<sup>2</sup> evolution of the first moment of g1 shows agreement in leading order with Heavy Baryon Chiral Perturbation Theory. However, a significant discrepancy is observed between the γ<sup>p0</sup> data and Chiral Perturbation calculations for γ<sup>p0</sup>, even at the lowest Q<sup>2</sup>.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sokhan, Dr Daria and McKinnon, Dr Bryan and Livingston, Dr Kenneth and Watts, Dr Daniel and Protopopescu, Dr Dan and Ireland, Professor David and Kellie, Dr James and Rosner, Professor Guenther and Johnstone, Mr John
Authors: Prok, Y., Bosted, P., Burkert, V., Deur, A., Dharmawardane, K., Dodge, G., Griffioen, K., Kuhn, S., Minehart, R., Adams, G., Amaryan, M., Anghinolfi, M., Asryan, G., Audit, G., Avakian, H., Bagdasaryan, H., Baillie, N., Ball, J., Baltzell, N., Barrow, S., Battaglieri, M., Beard, K., Bedlinskiy, I., Bektasoglu, M., Bellis, M., Benmouna, N., Berman, B., Biselli, A., Blaszczyk, L., Boiarinov, S., Bonner, B., Bouchigny, S., Bradford, R., Branford, D., Briscoe, W., Brooks, W., Bultmann, S., Butuceanu, C., Calarco, J., Careccia, S., Carman, D., Casey, L., Cazes, A., Chen, S., Cheng, L., Cole, P., Collins, P., Coltharp, P., Cords, D., Corvisiero, P., Crabb, D., Crede, V., Cummings, J., Dale, D., Dashyan, N., De Masi, R., De Vita, R., De Sanctis, E., Degtyarenko, P., Denizli, H., Dennis, L., Dhuga, K., Dickson, R., Djalali, C., Doughty, D., Dugger, M., Dytman, S., Dzyubak, O., Egiyan, H., Egiyan, K., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fatemi, R., Fedotov, G., Feldmann, G., Fersh, R., Feuerbach, R., Forest, T., Fradi, A., Funsten, H., Garcon, M., Gavalian, G., Gevorgyan, N., Gilfoyle, G., Giovanetti, K., Girod, F., Goetz, J., Golovatch, E., Gothe, R., Guidal, M., Guillo, M., Guler, N., Guo, L., Gyurjyan, V., Hadjidakis, C., Hafidi, K., Hakobyan, H., Hanretty, C., Hardie, J., Hassall, N., Heddle, D., Hersman, F., Hicks, K., Hleiqawi, I., Holtrop, M., Huertas, M., Hyde-Wright, C., Ilievan, Y., Ireland, D., Ishkhanov, B., Isupov, E., Ito, M., Jenkins, D., Jo, H., Johnstone, J., Joo, K., Juengst, H., Kalantarians, N., Keith, C., Kellie, J., Khandaker, M., Kim, K., Kim, K., Kim, W., Klein, A., Klein, F., Klusman, M., Kossov, M., Krahn, Z., Kramer, L., Kubarovsky, V., Kuhn, J., Kuleshov, S., Kuznetsov, V., Lachniet, J., Laget, J., Langheinrich, J., Lawrence, D., Li, J., Lima, A., Livingston, K., Lu, H., Lukashin, K., MacCormick, M., Marchand, C., Markov, N., Mattione, R., McAleer, S., McKinnon, B., McNabb, J., Mecking, B., Mestayer, M., Meyere, C., Mibe, T., Mikhailov, K., Mirazita, M., Miskimen, R., Mokeev, V., Morand, L., Moreno, B., Moriya, K., Morrow, S., Moteabbed, M., Mueller, J., Munevar, E., Mutchler, G., Nadel-Turonski, R., Nasseripour, R., Niccolai, S., Niculescu, G., Niculescu, I., Niczyporuk, B., Niroula, M., Niyazov, R., Nozar, M., O'Rielly, G., Osipenko, M., Ostrovidov, A., Park, K., Pasyuk, E., Paterson, C., Pereira, S., Philips, S., Pierce, J., Pivnyuk, N., Pocanic, D., Pogorelko, O., Popa, I., Pozdniakov, S., Preedom, B., Price, J., Procureur, S., Protopopescu, D., Qin, L., Raue, B., Riccardi, G., Ricco, G., Ripani, M., Ritchie, B., Rosner, G., Rossi, P., Rowntree, D., Rubin, P., Sabatie, F., Salamanca, J., Salgado, C., Santoro, J., Sapunenko, V., Schumacher, R., Seely, M., Serov, V., Sharabian, Y., Sharov, D., Shaw, J., Shvedunov, N., Skabelin, A., Smith, E., Smith, L., Sober, D., Sokhan, D., Stavinsky, A., Stepanyan, S., Stepanyan, S., Stokes, B., Stoler, P., Strakovsky, I., Strauch, S., Suleiman, R., Taiuti, M., Tedeschi, D., Tkabladze, A., Tkachenko, S., Todor, L., Ungaro, M., Vineyard, M., Vlassov, A., Watts, D., Weinstein, L., Weygand, D., Williams, M., Wolin, E., Wood, M., Yegneswaran, A., Yun, J., Zana, L., Zhang, J., Zhao, B., and Zhao, Z.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physics Letters B
Publisher:Elsevier BV
ISSN:0370-2693
ISSN (Online):1873-2445
Published Online:07 January 2009

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