Measurement of Target and Double-spin Asymmetries for the vec evec pto eπ^+ (n) Reaction in the Nucleon Resonance Region at Low Q²

X. Zheng , K.P. Adhikari , P. Bosted , A. Deur , V. Drozdov , L. El Fassi , Hyekoo Kang , K. Kovacs

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S. Kuhn E. Long S.K. Phillips M. Ripani K. Slifer L.C. Smith D. Adikaram Z. Akbar M.J. Amaryan S. Anefalos Pereira G. Asryan H. Avakian R.A. Badui J. Ball N.A. Baltzell M. Battaglieri V. Batourine I. Bedlinskiy A.S. Biselli W.J. Briscoe S. B\"ultmann V.D. Burkert D.S. Carman A. Celentano S. Chandavar G. Charles J.-P. Chen T. Chetry Seonho Choi G. Ciullo L. Clark L. Colaneri P.L. Cole N. Compton M. Contalbrigo V. Crede A. D'Angelo N. Dashyan R. De Vita E. De Sanctis C. Djalali G.E. Dodge R. Dupre H. Egiyan A. El Alaoui L. Elouadrhiri P. Eugenio E. Fanchini G. Fedotov R. Fersch A. Filippi J.A. Fleming N. Gevorgyan Y. Ghandilyan G.P. Gilfoyle K.L. Giovanetti F.X. Girod C. Gleason E. Golovach R.W. Gothe K.A. Griffioen M. Guidal N. Guler L. Guo C. Hanretty N. Harrison M. Hattawy K. Hicks M. Holtrop S.M. Hughes Y. Ilieva D.G. Ireland B.S. Ishkhanov E.L. Isupov D. Jenkins H. Jiang H.S. Jo S. Joosten D. Keller G. Khachatryan M. Khandaker A. Kim W. Kim F.J. Klein V. Kubarovsky L. Lanza P. Lenisa K. Livingston I .J .D. MacGregor N. Markov B. McKinnon M. Mirazita V. Mokeev A. Movsisyan E. Munevar C. Munoz Camacho G. Murdoch P. Nadel-Turonski L.A. Net A. Ni S. Niccolai G. Niculescu I. Niculescu M. Osipenko A.I. Ostrovidov M. Paolone R. Paremuzyan K. Park E. Pasyuk P. Peng S. Pisano O. Pogorelko J.W. Price A.J.R. Puckett B.A. Raue A. Rizzo G. Rosner P. Rossi P. Roy F. Sabati\'e C. Salgado R.A. Schumacher Y.G. Sharabian Iu. Skorodumina G.D. Smith D. Sokhan N. Sparveris I. Stankovic I.I. Strakovsky S. Strauch M. Taiuti Ye Tian M. Ungaro H. Voskanyan E. Voutier N.K. Walford D.P. Watts X. Wei L.B. Weinstein M.H. Wood N. Zachariou J. Zhang (The CLAS Collaboration)

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keywords resultsasymmetriestargetclasdouble-spinlongitudinallymodelsnucleon

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We report measurements of target- and double-spin asymmetries for the exclusive channel $\vec e\vec p\to e\pi^+ (n)$ 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 NH$_3$ 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 $Q^2$ range from $0.0065$ to $0.35$ (GeV$/c$)$^2$. The $Q^2$ access was made possible by a custom-built Cherenkov detector that allowed the detection of electrons for scattering angles as low as $6^\circ$. 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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Measurement of Target and Double-spin Asymmetries for the vec evec pto eπ^+ (n) Reaction in the Nucleon Resonance Region at Low Q²

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