Target and Beam-Target Spin Asymmetries in Exclusive π^+ and π^- Electroproduction with 1.6 to 5.7 GeV Electrons

P.E. Bosted , A.S. Biselli , S. Careccia , G. Dodge , R. Fersch , S.E. Kuhn , J. Pierce , Y. Prok

show 154 more authors

X. Zheng K.P. Adhikari 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 S. Boiarinov W.J. Briscoe S. B\"ultmann V.D. Burkert T. Cao D.S. Carman A. Celentano S. Chandavar G. Charles T. Chetry G. Ciullo L. Clark L. Colaneri P.L. Cole M. Contalbrigo O. Cortes V. Crede A. D'Angelo N. Dashyan R. De Vita A. Deur C. Djalali R. Dupre H. Egiyan A. El Alaoui L. El Fassi P. Eugenio E. Fanchini G. Fedotov A. Filippi J.A. Fleming T.A. Forest A. Fradi M. Gar\c{c}on N. Gevorgyan Y. Ghandilyan G.P. Gilfoyle K.L. Giovanetti F.X. Girod C. Gleason W. Gohn E. Golovatch R.W. Gothe K.A. Griffioen N. Guler L. Guo K. Hafidi C. Hanretty N. Harrison M. Hattawy D. Heddle 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 K. Joo S. Joosten D. Keller M. Khandaker W. Kim A. Klein F.J. Klein V. Kubarovsky S.V. Kuleshov L. Lanza P. Lenisa K. Livingston H.Y. Lu I .J .D. MacGregor N. Markov M.E. McCracken B. McKinnon C.A. Meyer R. Minehart M. Mirazita V. Mokeev A Movsisyan E. Munevar C. Munoz Camacho P. Nadel-Turonski L.A. Net A. Ni S. Niccolai G. Niculescu I. Niculescu M. Osipenko A.I. Ostrovidov R. Paremuzyan K. Park E. Pasyuk P. Peng W. Phelps S. Pisano O. Pogorelko J.W. Price S. Procureur D. Protopopescu A.J.R. Puckett B.A. Raue M. Ripani A. Rizzo G. Rosner P. Rossi P. Roy F. Sabati\'e C. Salgado R.A. Schumacher E. Seder Y.G. Sharabian A. Simonyan Iu. Skorodumina G.D. Smith N. Sparveris Ivana Stankovic S. Stepanyan I.I. Strakovsky S. Strauch V. Sytnik M. Taiuti Ye Tian B. Torayev M. Ungaro H. Voskanyan E. Voutier N.K. Walford D.P. Watts X. Wei L.B. Weinstein M.H. Wood N. Zachariou L. Zana J. Zhang Z.W. Zhao I. Zonta (CLAS Collaboration)

Authors on Pith no claims yet

classification ⚛️ nucl-ex

keywords asymmetrieslargeresultsbeam-targetbinselectronselectroproductionexclusive

0 comments

read the original 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 $1.1<W<2.6$ GeV and $0.05<Q^2<5$ GeV$^2$, with good anglular coverage in the forward hemisphere. The asymmetry results were divided into approximately 40,000 kinematic bins for $\pi^+$ from free protons and 15,000 bins for $\pi^-$ production from bound nucleons in the deuteron. The present results are found to be in reasonable agreement with fits to previous world data for $W<1.7$ GeV and $Q^2<0.5$ GeV$^2$, with discrepancies increasing at higher values of $Q^2$, especially for $W>1.5$ 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.

This paper has not been read by Pith yet.

Target and Beam-Target Spin Asymmetries in Exclusive π^+ and π^- Electroproduction with 1.6 to 5.7 GeV Electrons

discussion (0)