Q2 evolution of the neutron spin structure moments using a 3He target

We have measured the spin structure functions g(1) and g(2) of 3He in a double-spin experiment by inclusively scattering polarized electrons at energies ranging from 0.862 to 5.058 GeV off a polarized 3He target at a 15.5 degrees scattering angle. Excitation energies covered the resonance and the on...

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Published in:Physical review letters 2004-01, Vol.92 (2), p.022301-022301
Main Authors: Amarian, M, Auerbach, L, Averett, T, Berthot, J, Bertin, P, Bertozzi, B, Black, T, Brash, E, Brown, D, Burtin, E, Calarco, J, Cates, G, Chai, Z, Chen, J-P, Choi, Seonho, Chudakov, E, Cisbani, E, De Jager, C W, Deur, A, DiSalvo, R, Dieterich, S, Djawotho, P, Finn, M, Fissum, K, Fonvieille, H, Frullani, S, Gao, H, Gao, J, Garibaldi, F, Gasparian, A, Gilad, S, Gilman, R, Glamazdin, A, Glashausser, C, Goldberg, E, Gomez, J, Gorbenko, V, Hansen, J-O, Hersman, B, Holmes, R, Huber, G M, Hughes, E, Humensky, B, Incerti, S, Iodice, M, Jensen, S, Jiang, X, Jones, C, Jones, G, Jones, M, Jutier, C, Ketikyan, A, Kominis, I, Korsch, W, Kramer, K, Kumar, K, Kumbartzki, G, Kuss, M, Lakuriqi, E, Laveissiere, G, Lerose, J, Liang, M, Liyanage, N, Lolos, G, Malov, S, Marroncle, J, McCormick, K, McKeown, R, Meziani, Z-E, Michaels, R, Mitchell, J, Papandreou, Z, Pavlin, T, Petratos, G G, Pripstein, D, Prout, D, Ransome, R, Roblin, Y, Rowntree, D, Rvachev, M, Sabatie, F, Saha, A, Slifer, K, Souder, P, Saito, T, Strauch, S, Suleiman, R, Takahashi, K, Teijiro, S, Todor, L, Tsubota, H, Ueno, H, Urciuoli, G, Van Der Meer, R, Vernin, P, Voskanian, H, Wojtsekhowski, B, Xiong, F, Xu, W, Yang, J-C
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Language:English
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Summary:We have measured the spin structure functions g(1) and g(2) of 3He in a double-spin experiment by inclusively scattering polarized electrons at energies ranging from 0.862 to 5.058 GeV off a polarized 3He target at a 15.5 degrees scattering angle. Excitation energies covered the resonance and the onset of the deep inelastic regions. We have determined for the first time the Q2 evolution of Gamma(1)(Q2)= integral (1)(0)g(1)(x,Q2)dx, Gamma(2)(Q2)= integral (1)(0)g(2)(x,Q2)dx, and d(2)(Q2)= integral (1)(0)x(2)[2g(1)(x,Q2)+3g(2)(x,Q2)]dx for the neutron in the range 0.1< or =Q2< or =0.9 GeV2 with good precision. Gamma(1)(Q2) displays a smooth variation from high to low Q2. The Burkhardt-Cottingham sum rule holds within uncertainties and d(2) is nonzero over the measured range.
ISSN:0031-9007