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Measurement of target and double-spin asymmetries for the e ⃗ p ⃗ → e π + ( n ) reaction in the nucleon resonance region at low Q 2

X. Zheng P. Adhikari P. Bosted A. Deur V. Drozdov L. El Fassi Hyekoo Kang K. Kovacs S. Kuhn E. Long S. Phillips M. Ripani K. Slifer C. Smith D. Adikaram Z. Akbar J. Amaryan S. Anefalos Pereira G. Asryan H. Avakian R. A. Badui J. Ball 1 N. Baltzell M. Battaglieri V. Batourine I. Bedlinskiy S. Biselli J. Briscoe S. Bültmann D. Burkert S. Carman A. Celentano S. Chandavar G. Charles 2 Jie Chen T. Chetry Seonho Choi G. Ciullo L. Clark L. Colaneri P. Cole N. Compton M. Contalbrigo V. Crede A. d'Angelo N. Dashyan R. de Vita E. de Sanctis C. Djalali E. Dodge R. Dupre 2 H. Egiyan A. El Alaoui L. Elouadrhiri P. Eugenio E. Fanchini G. Fedotov R. Fersch A. Filippi J. Fleming N. Gevorgyan Y. Ghandilyan P. Gilfoyle K. Giovanetti X. Girod 1 C. Gleason E. Golovach R. Gothe A. Griffioen M. Guidal 2 N. Guler L. Guo C. Hanretty N. Harrison M. Hattawy K. Hicks M. Holtrop M. Hughes Y. Ilieva D. Ireland S. Ishkhanov E. Isupov D. Jenkins H. Jiang H. Jo 2 S. Joosten D. Keller G. Khachatryan M. Khandaker A. Kim W. Kim J. Klein V. Kubarovsky L. Lanza P. Lenisa K. Livingston I. Macgregor N. Markov B. Mckinnon M. Mirazita V. Mokeev A. Movsisyan E. Munevar C. Munoz Camacho 2 G. Murdoch P. Nadel-Turonski A. Net A. Ni S. Niccolai 2 G. Niculescu I. Niculescu M. Osipenko I. Ostrovidov M. Paolone R. Paremuzyan K. Park E. Pasyuk P. Peng S. Pisano O. Pogorelko J. Price J. Puckett A. Raue A. Rizzo G. Rosner P. Rossi Pascal Roy F. Sabatié 1 C. Salgado R. A. Schumacher Y. G. Sharabian Iu. Skorodumina D. Smith D. Sokhan N. Sparveris I. Stankovic I. Strakovsky S. Strauch M. Taiuti Ye Tian M. Ungaro H. Voskanyan E. Voutier 2 N. Walford D. P. Watts X. Wei L. B. Weinstein M. H. Wood N. Zachariou J. Zhang I. Zonta
Abstract : We report measurements of target- and double-spin asymmetries for the exclusive channel e⃗ p⃗ →eπ+(n) in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries were extracted from data obtained using a longitudinally polarized NH3 target and a longitudinally polarized electron beam with energies 1.1, 1.3, 2.0, 2.3, and 3.0 GeV. The new results are consistent with previous CLAS publications but are extended to a low Q2 range from 0.0065 to 0.35(GeV/c)2. The Q2 access was made possible by a custom-built Cherenkov detector that allowed the detection of electrons for scattering angles as low as 6∘. These results are compared with the unitary isobar models JANR and MAID, the partial-wave analysis prediction from SAID, and the dynamic model DMT. In many kinematic regions our results, in particular results on the target asymmetry, help to constrain the polarization-dependent components of these models.
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Submitted on : Thursday, December 8, 2016 - 11:13:49 AM
Last modification on : Monday, December 13, 2021 - 9:14:57 AM

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X. Zheng, P. Adhikari, P. Bosted, A. Deur, V. Drozdov, et al.. Measurement of target and double-spin asymmetries for the e ⃗ p ⃗ → e π + ( n ) reaction in the nucleon resonance region at low Q 2. Physical Review C, American Physical Society, 2016, 94 (4), pp.045206. ⟨10.1103/PhysRevC.94.045206⟩. ⟨in2p3-01412288⟩



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