Measurement of the Q^{2} Dependence of the Deuteron Spin Structure Function g_{1} and its Moments at Low Q^{2} with CLAS

• Published in: Physical review letters 2018-02, Vol.120 (6), p.062501-062501
• Main Authors: Adhikari, K P, Deur, A, El Fassi, L, Kang, H, Kuhn, S E, Ripani, M, Slifer, K, Zheng, X, Adhikari, S, Akbar, Z, Amaryan, M J, Avakian, H, Ball, J, Balossino, I, Barion, L, Battaglieri, M, Bedlinskiy, I, Biselli, A S, Bosted, P, Briscoe, W J, Brock, J, Bültmann, S, Burkert, V D, Thanh Cao, F, Carlin, C, Carman, D S, Celentano, A, Charles, G, Chen, J-P, Chetry, T, Choi, S, Ciullo, G, Clark, L, Cole, P L, Contalbrigo, M, Crede, V, D'Angelo, A, Dashyan, N, De Vita, R, De Sanctis, E, Defurne, M, Djalali, C, Dodge, G E, Drozdov, V, Dupre, R, Egiyan, H, El Alaoui, A, Elouadrhiri, L, Eugenio, P, Fedotov, G, Filippi, A, Ghandilyan, Y, Gilfoyle, G P, Golovatch, E, Gothe, R W, Griffioen, K A, Guidal, M, Guler, N, Guo, L, Hafidi, K, Hakobyan, H, Hanretty, C, Harrison, N, Hattawy, M, Heddle, D, Hicks, K, Holtrop, M, Hyde, C E, Ilieva, Y, Ireland, D G, Isupov, E L, Jenkins, D, Jo, H S, Johnston, S C, Joo, K, Joosten, S, Kabir, M L, Keith, C D, Keller, D, Khachatryan, G, Khachatryan, M, Khandaker, M, Kim, W, Klein, A, Klein, F J, Konczykowski, P, Kovacs, K, Kubarovsky, V, Lanza, L, Lenisa, P, Livingston, K, Long, E, MacGregor, I J D, Markov, N, Mayer, M, McKinnon, B, Meekins, D G, Meyer, C A, Mineeva, T, Mirazita, M
• Format: Article
• Language: English
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.120.062501

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.