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Precision measurements of $g_1$ of the proton and of the deuteron with 6 GeV electrons

Y. Prok P. Bosted N. Kvaltine K. P. Adhikari D. Adikaram M. Aghasyan M. J. Amaryan M. D. Anderson S. Anefalos Pereira H. Avakian H. Baghdasaryan J. Ball 1 N. A. Baltzell M. Battaglieri A. S. Biselli J. Bono W. J. Briscoe J. Brock W. K. Brooks S. Bültmann V. D. Burkert C. Carlin D. S. Carman A. Celentano S. Chandavar L. Colaneri P. L. Cole M. Contalbrigo O. Cortes D. Crabb V. Crede A. d'Angelo N. Dashyan R. de Vita E. de Sanctis A. Deur C. Djalali G. E. Dodge D. Doughty R. Dupre 2 A. El Alaoui L. El Fassi L. Elouadrhiri G. Fedotov S. Fegan R. Fersch J. A. Fleming T. A. Forest M. Garcon 1 N. Gevorgyan Y. Ghandilyan G. P. Gilfoyle F. X. Girod K. L. Giovanetti J. T. Goetz W. Gohn R. W. Gothe K. A. Griffioen B. Guegan 2 N. Guler K. Haffidi C. Hanretty N. Harrison M. Hattawy 2 K. Hicks D. Ho M. Holtrop Y. Ilieva D. G. Ireland B. S. Ishkhanov E. L. Isupov S. Jawalkar X. Jiang H. S. Jo 2 K. Joo N. Kalantarians C. Keith D. Keller M. Khandaker A. Kim W. Kim A. Klein F. J. Klein S. Koirala V. Kubarovsky S. E. Kuhn S. V. Kuleshov P. Lenisa K. Livingston H. Y. Lu I . J. D. Macgregor N. Markov M. Mayee B. Mckinnon D. Meekins T. Mineeva M. Mirazita V. Mokeev R. A. Montgomery H. Moutarde 1 A Movsisyan E. Munevar C. Muñoz Camacho 2 P. Nadel-Turonski S. Niccolai 2 G. Niculescu I. Niculescu M. Osipenko A. I. Ostrovidov L. L. Pappalardo R. Paremuzyan K. Park P. Peng J. J. Phillips J. Pierce S. Pisano 2 O. Pogorelko S. Pozdniakov J. W. Price S. Procureur 1 D. Protopopescu A. J. R. Puckett B. A. Raue D. Rimal M. Ripani A. Rizzo G. Rosner P. Rossi P. Roy F. Sabatié 1 M. S. Saini C. Salgado D. Schott R. A. Schumacher E. Seder Y. G. Sharabian A. Simonyan C. Smith G. Smith D. I. Sober D. Sokhan 2 S. S. Stepanyan S. Stepanyan I. I. Strakovsky S. Strauch V. Sytnik M. Taiuti W. Tang S. Tkachenko M. Ungaro B . Vernarsky A. V. Vlassov H. Voskanyan E. Voutier 3 N. K. Walford D . P. Watts L. B. Weinstein N. Zachariou L. Zana J. Zhang B. Zhao Z. W. Zhao I. Zonta
Abstract : The inclusive polarized structure functions of the proton and deuteron, g1p and g1d, 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 lab angles between 18 and 45 degrees were detected using the CEBAF Large Acceptance Spectrometer (CLAS). For the usual DIS kinematics, Q^2>1 GeV^2 and the final-state invariant mass W>2 GeV, the ratio of polarized to unpolarized structure functions g1/F1 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 QCD, 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.
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Submitted on : Monday, May 5, 2014 - 11:27:38 AM
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Y. Prok, P. Bosted, N. Kvaltine, K. P. Adhikari, D. Adikaram, et al.. Precision measurements of $g_1$ of the proton and of the deuteron with 6 GeV electrons. Physical Review C, American Physical Society, 2014, 90, pp.025212. ⟨10.1103/PhysRevC.90.025212⟩. ⟨in2p3-00986978⟩

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