Target and beam-target spin asymmetries in exclusive π + and π − electroproduction with 1.6- to 5.7-GeV electrons

E. Bosted S. Biselli S. Careccia G. Dodge R. Fersch N. Guler Estelle Kuhn J. Pierce Y. Prok X. Zheng P. Adhikari D. Adikaram Z. Akbar J. Amaryan S. Anefalos Pereira G. Asryan H. Avakian A. Badui J. Ball 1 N. Baltzell M. Battaglieri V. Batourine I. Bedlinskiy S. Boiarinov J. Briscoe S. Bültmann V. Burkert T. Cao S. Carman A. Celentano S. Chandavar G. Charles 2 T. Chetry G. Ciullo L. Clark L. Colaneri L. Cole M. Contalbrigo O. Cortes V. Crede A. d'Angelo N. Dashyan R. de Vita A. Deur C. Djalali R. Dupre 2 H. Egiyan A. El Alaoui L. El Fassi P. Eugenio E. Fanchini G. Fedotov A. Filippi J. Fleming A. Forest A. Fradi 2 M. Garçon 1 N. Gevorgyan Y. Ghandilyan P. Gilfoyle L. Giovanetti X. Girod 1 C. Gleason W. Gohn E. Golovatch W. Gothe A. Griffioen L. Guo K. Hafidi C. Hanretty N. Harrison M. Hattawy D. Heddle K. Hicks M. Holtrop M. Hughes Y. Ilieva G. Ireland B. Ishkhanov L. Isupov D. Jenkins H. Jiang H. Jo 2 K. Joo S. Joosten D. Keller M. Khandaker W. Kim A. Klein J. Klein V. Kubarovsky V. Kuleshov L. Lanza P. Lenisa K. Livingston H. Lu I. Macgregor N. Markov E. Mccracken B. Mckinnon A. Meyer R. Minehart M. Mirazita V. Mokeev A. Movsisyan E. Munevar C. Munoz Camacho 2 P. Nadel-Turonski L. Net A. Ni S. Niccolai 2 G. Niculescu I. Niculescu M. Osipenko I. Ostrovidov R. Paremuzyan K. Park E. Pasyuk P. Peng W. Phelps S. Pisano O. Pogorelko J. Price S. Procureur 1 D. Protopopescu J. Puckett B. Raue M. Ripani A. Rizzo G. Rosner P. Rossi P. Roy F. Sabatié 1 C. Salgado A. Schumacher E. Seder Y. G. Sharabian A. Simonyan Iu. Skorodumina G. D. Smith N. Sparveris Ivana Stankovic S. Stepanyan I. Strakovsky S. Strauch V. Sytnik M. Taiuti Ye Tian B. Torayev M. Ungaro H. Voskanyan E. Voutier 2 N. Walford D. P. Watts X. Wei L. Weinstein M. H. Wood N. Zachariou L. Zana J. Zhang Z. W. Zhao I. Zonta
Abstract : Beam-target double spin asymmetries and target single-spin asymmetries in exclusive $\pi^+$ and $\pi^-$ electroproduction were obtained from scattering of 1.6 to 5.7 GeV longitudinally polarized electrons from longitudinally polarized protons (for $\pi^+$) and deuterons (for $\pi^-$) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is $1.11.5$ GeV. Very large target-spin asymmetries are observed for $W>1.6$ GeV. When combined with cross section measurements, the present results will provide powerful constraints on nucleon resonance amplitudes at moderate and large values of $Q^2$, for resonances with masses as high as 2.3 GeV.
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E. Bosted, S. Biselli, S. Careccia, G. Dodge, R. Fersch, et al.. Target and beam-target spin asymmetries in exclusive π + and π − electroproduction with 1.6- to 5.7-GeV electrons. Physical Review C, American Physical Society, 2016, 94 (5), pp.055201. ⟨10.1103/PhysRevC.94.055201⟩. ⟨in2p3-01332574⟩

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