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arXiv · 1711.01974

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. Bueltmann·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
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Abstract

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 Gerasimov-Drell-Hearn sum, the moment $\bar{\Gamma}_{1}^{d}$ and the integral $\bar{I}_\gamma^d$ related to 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 the first in a program of benchmark measurements of polarization observables in the $\chi$PT domain.

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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. Bueltmann, 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. 2017-11-06. Measurement of the Q^2 Dependence of the Deuteron Spin Structure Function g_1 and its Moments at Low Q^2 with CLAS. https://doi.org/10.1103/physrevlett.120.062501

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