3 years ago

Measurement of the Q2-dependence of the deuteron spin structure function g1 and its moments at low Q2 with CLAS.

H. Hakobyan, K. Hafidi, C. Djalali, S. Choi, C. Carlin, I. Balossino, R.W. Gothe, Z. Akbar, N. Guler, W.J. Briscoe, M. Ripani, H. Kang, M. Contalbrigo, T. Chetry, A. Celentano, P. Eugenio, S. Bueltmann, X. Zheng, G. Fedotov, H. Egiyan, V.D. Burkert, E. De Sanctis, A.S. Biselli, G.E. Dodge, D.S. Carman, L. Guo, N. Dashyan, J. Brock, D. Heddle, R. Dupre, M. Battaglieri, A. D'Angelo, F. Thanh Cao, P.L. Cole, S.E. Kuhn, K.P. Adhikari, A. Deur, V. Drozdov, V. Crede, J.-P. Chen, C. Hanretty, L. Elouadrhiri, G. Charles, A. El Alaoui, M.J. Amaryan, S. Adhikari, L. Clark, M. Hattawy, N. Harrison, E. Golovatch, J. Ball, G.P. Gilfoyle, A. Filippi, L. El Fassi, I. Bedlinskiy, R. De Vita, Y. Ghandilyan, G. Ciullo, P. Bosted, M. Guidal, H. Avakian, M. Defurne, K.A. Griffioen, L. Barion, K. Slifer

We measured the $g_{1}$ spin structure function of the deuteron at low $Q^{2}$, where QCD can be approximated with chiral perturbation theory ($\chi PT$). The data cover the resonance region, up to an invariant mass of $W\approx1.9$~GeV. The generalized GDH sum, the moment $\Gamma_{1}^{d}$ and the spin polarizability $\gamma_{0}^{d}$ 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 $\chi PT$ calculations and models. These results are thefirst in a program of benchmark measurements of polarization observables in the $\chi PT$ domain.

Publisher URL: http://arxiv.org/abs/1711.01974

DOI: arXiv:1711.01974v1

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