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

P. E. Bosted et al. (CLAS Collaboration)
Phys. Rev. C 94, 055201 – Published 1 November 2016
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Abstract

Beam-target double-spin asymmetries and target single-spin asymmetries in exclusive π+ and quasiexclusive π electroproduction were obtained from scattering of 1.6- to 5.7-GeV longitudinally polarized electrons from longitudinally polarized protons (for π+) and deuterons (for π) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is 1.1<W<2.6 GeV and 0.05<Q2<5GeV2, with good angular coverage in the forward hemisphere. The asymmetry results were divided into approximately 40 000 kinematic bins for π+ from free protons and 15 000 bins for π 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 Q2<0.5GeV2, with discrepancies increasing at higher values of Q2, 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 can provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q2, for resonances with masses as high as 2.3 GeV.

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  • Received 18 April 2016
  • Revised 15 August 2016

DOI:https://doi.org/10.1103/PhysRevC.94.055201

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 94, Iss. 5 — November 2016

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