Precision measurements of g 1 of the proton and of the deuteron with 6 GeV electrons

/ Authors

Y. Prok, P. Bosted, N. Kvaltine, K. Adhikari, D. Adikaram, M. Aghasyan, M. Amaryan, M. Anderson, S. Pereira, H. Avakian

and 154 more authors

H. Baghdasaryan, J. Ball, N. Baltzell, M. Battaglieri, A. Biselli, J. Bono, W. Briscoe, J. Brock, W. Brooks, S. Bultmann, V. Burkert, C. Carlin, D. Carman, A. Celentano, S. Chandavar, L. Colaneri, P. Cole, M. Contalbrigo, O. Cortes, D. Crabb, V. Crede, A. D’Angelo, N. Dashyan, R. Vita, E. Sanctis, A. Deur, C. Djalali, G. Dodge, D. Doughty, R. Dupré, A. Alaoui, Lamiaa El Fassi, L. Elouadrhiri, G. Fedotov, S. Fegan, R. Fersch, J. Fleming, T. Forest, M. Garçon, N. Gevorgyan, Y. Ghandilyan, G. Gilfoyle, F. Girod, K. Giovanetti, J. Goetz, W. Gohn, R. Gothe, K. Griffioen, B. Guegan, N. Guler, K. Haffidi, C. Hanretty, N. Harrison, M. Hattawy, K. Hicks, D. Ho, M. Holtrop, Y. Ilieva, D. Ireland, B. Ishkhanov, E. Isupov, S. Jawalkar, X.Jiang, H. Jo, K. Joo, N. Kalantarians, C. Keith, D. Keller, M. Khandaker, A. Kim, W. Kim, A. Klein, F. Klein, S. Koirala, V. Kubarovsky, S. Kuhn, S. Kuleshov, P. Lenisa, K. Livingston, H. Lu, I. MacGregor, N. Markov, M. Mayee, B. McKinnon, D. Meekins, T. Mineeva, M. Mirazita, V. Mokeev, R. Montgomery, H. Moutarde, A. Movsisyan, E. Munevar, C. Camacho, P. Nadel-Turonski, S. Niccolai, G. Niculescu, I. Niculescu, M. Osipenko, A. Ostrovidov, L. Pappalardo, R. Paremuzyan, K. Park, P. Peng, J. Phillips, J. Pierce, S. Pisano, O. Pogorelko, S. Pozdniakov, J. Price, S. Procureur, D. Protopopescu, A. Puckett, B. Raue, D. Rimal, M. Ripani, Alessandro Rizzo, G. Rosner, P. Rossi, P. Roy, F. Sabati'e, M. Saini, C. Salgado, D. Schott, R. Schumacher, E. Seder, Y. Sharabian, A. Simonyan, C. Smith, G. Smith, D. Sober, D. Sokhan, S. Stepanyan, S. Stepanyan, I. Strakovsky, S. Strauch, V. Sytnik, M. Taiuti, W. Tang, S. Tkachenko, M. Ungaro, B. Vernarsky, A. Vlassov, H. Voskanyan, E. Voutier, N. Walford, D. Watts, L. Weinstein, N. Zachariou, L. Zana, J. Zhang, B. Zhao, Z. Zhao, I. Zonta, For the Clas Collaboration

/ Abstract

The inclusive polarized structure functions of the proton and deuteron, g(1)(p) and g(1)(d) , were measured with high statistical precision using polarized 6 GeV electrons incident on a polarized ammonia target in Hall B at Jefferson Laboratory. Electrons scattered at laboratory angles between 18 and 45 degrees were detected using the CEBAF Large Acceptance Spectrometer (CLAS). For the usual deep inelastic region kinematics, Q(2) > 1 GeV2 and the final-state invariant mass W > 2 GeV, the ratio of polarized to unpolarized structure functions g(1)/F-1 is found to be nearly independent of Q(2) at fixed x. Significant resonant structure is apparent at values of W up to 2.3 GeV. In the framework of perturbative quantum chromodynamics, the high-W results can be used to better constrain the polarization of quarks and gluons in the nucleon, as well as high-twist contributions.

Journal: Physical Review C

DOI: 10.1103/PhysRevC.90.025212