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First measurement of the polarization observable E in the p→(γ→,π<sup>+</sup>)n reaction up to 2.25 GeV
Strauch, S Briscoe, WJ Döring, M Klempt, E Nikonov, VA Pasyuk, E Rönchen, D Sarantsev, AV Strakovsky, I Workman, R
Strauch, S
Briscoe, WJ
Döring, M
Klempt, E
Nikonov, VA
Pasyuk, E
Rönchen, D
Sarantsev, AV
Strakovsky, I
Workman, R
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Journal Article
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2015-11-12
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10.1016/j.physletb.2015.08.053
Abstract
© 2015 The Authors. First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction γ→p→→π+n, has been measured using a circularly polarized tagged-photon beam, with energies from 0.35 to 2.37 GeV. The final-state pions were detected with the CEBAF Large Acceptance Spectrometer in Hall B at the Thomas Jefferson National Accelerator Facility. These polarization data agree fairly well with previous partial-wave analyses at low photon energies. Over much of the covered energy range, however, significant deviations are observed, particularly in the high-energy region where high-. L multipoles contribute. The data have been included in new multipole analyses resulting in updated nucleon resonance parameters. We report updated fits from the Bonn-Gatchina, Jülich-Bonn, and SAID groups.
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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