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Measurement of target and double-spin asymmetries for the (e)over-right-arrow (p)over-right-arrow -> e pi(+)(n) reaction in the nucleon resonance region at low Q(2)

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  • X. Zheng
  • K. P. Adhikari
  • P. Bosted
  • A. Deur
  • V. Drozdov
  • L. El Fassi
  • Hyekoo Kang
  • K. Kovacs
  • 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. Bueltmann
  • 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
  • Jamie Fleming
  • Simon Hughes
  • G. D. Smith
  • I. Stankovic
  • D. P. Watts
  • N. Zachariou
  • CLAS Collaboration

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Original languageEnglish
Article number045206
Number of pages19
JournalPhysical Review C
Issue number4
Publication statusPublished - 19 Oct 2016


We report measurements of target- and double-spin asymmetries for the exclusive channel (e) over right arrow (p) over right arrow -> ep(+)(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 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 degrees. 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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