Measurement of the Q^{2} Dependence of the Deuteron Spin Structure Function g_{1} and its Moments at Low Q^{2} with CLAS.
K P Adhikari, A Deur, L El Fassi, H Kang, S E Kuhn, M Ripani, K Slifer, X Zheng, S Adhikari, Z Akbar, M J Amaryan, H Avakian, J Ball, I Balossino, L Barion, M Battaglieri, I Bedlinskiy, A S Biselli, P Bosted, W J Briscoe, J Brock, S Bültmann, V D Burkert, F Thanh Cao, C Carlin, D S Carman, A Celentano, G Charles, J-P Chen, T Chetry, S Choi, G Ciullo, L Clark, P L Cole, M Contalbrigo, V Crede, A D'Angelo, N Dashyan, R De Vita, E De Sanctis, M Defurne, C Djalali, G E Dodge, V Drozdov, R Dupre, H Egiyan, A El Alaoui, L Elouadrhiri, P Eugenio, G Fedotov, A Filippi, Y Ghandilyan, G P Gilfoyle, E Golovatch, R W Gothe, K A Griffioen, M Guidal, N Guler, L Guo, K Hafidi, H Hakobyan, C Hanretty, N Harrison, M Hattawy, D Heddle, K Hicks, M Holtrop, C E Hyde, Y Ilieva, D G Ireland, E L Isupov, D Jenkins, H S Jo, S C Johnston, K Joo, S Joosten, M L Kabir, C D Keith, D Keller, G Khachatryan, M Khachatryan, M Khandaker, W Kim, A Klein, F J Klein, P Konczykowski, K Kovacs, V Kubarovsky, L Lanza, P Lenisa, K Livingston, E Long, I J D MacGregor, N Markov, M Mayer, B McKinnon, D G Meekins, C A Meyer, T Mineeva, M Mirazita, V Mokeev, A Movsisyan, C Munoz Camacho, P Nadel-Turonski, G Niculescu, S Niccolai, M Osipenko, A I Ostrovidov, M Paolone, L Pappalardo, R Paremuzyan, K Park, E Pasyuk, D Payette, W Phelps, S K Phillips, J Pierce, O Pogorelko, J Poudel, J W Price, Y Prok, D Protopopescu, B A Raue, A Rizzo, G Rosner, P Rossi, F Sabatié, C Salgado, R A Schumacher, Y G Sharabian, T Shigeyuki, A Simonyan, Iu Skorodumina, G D Smith, N Sparveris, D Sokhan, S Stepanyan, I I Strakovsky, S Strauch, V Sulkosky, M Taiuti, J A Tan, M Ungaro, E Voutier, X Wei, L B Weinstein, J Zhang, Z W Zhao
We measured the g_{1} spin structure function of the deuteron at low Q^{2}, where QCD can be approximated with chiral perturbation theory (χPT). The data cover the resonance region, up to an invariant mass of W≈1.9 GeV. The generalized Gerasimov-Drell-Hearn sum, the moment Γ_{1}^{d} and the spin polarizability γ_{0}^{d} are precisely determined down to a minimum Q^{2} of 0.02 GeV^{2} for the first time, about 2.5 times lower than that of previous data. We compare them to several χPT calculations and models. These results are the first in a program of benchmark measurements of polarization observables in the χPT domain.
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