First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction (p) over right arrow((gamma) over right arrow, pi(+))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, Jfilich-Bonn, and SAID groups. (C) 2015 The Authors. Published by Elsevier B.V.

Strauch, S., Briscoe, W., Doring, M., Klempt, E., Nikonov, V., Pasyuk, E., et al. (2015). First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV. PHYSICS LETTERS. SECTION B, 750, 53-58 [10.1016/j.physletb.2015.08.053].

First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV

COLANERI, LUCA;D'ANGELO, ANNALISA;PISANO, SILVIA;RIZZO, ALESSANDRO;ZONTA, IRENE
2015-11-12

Abstract

First results from the longitudinally polarized frozen-spin target (FROST) program are reported. The double-polarization observable E, for the reaction (p) over right arrow((gamma) over right arrow, pi(+))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, Jfilich-Bonn, and SAID groups. (C) 2015 The Authors. Published by Elsevier B.V.
12-nov-2015
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Con Impact Factor ISI
Baryon spectroscopy; Pion photoproduction; Polarization observables; FROST experiment
CLAS Collaboration
http://ac.els-cdn.com/S0370269315006541/1-s2.0-S0370269315006541-main.pdf?_tid=f98bba2c-0041-11e7-b756-00000aacb360&acdnat=1488567081_5aaf3dd9d740a928d4d208c3a2e11065
Strauch, S., Briscoe, W., Doring, M., Klempt, E., Nikonov, V., Pasyuk, E., et al. (2015). First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV. PHYSICS LETTERS. SECTION B, 750, 53-58 [10.1016/j.physletb.2015.08.053].
Strauch, S; Briscoe, W; Doring, M; Klempt, E; Nikonov, V; Pasyuk, E; Ronchen, D; Sarantsev, A; Strakovsky, I; Workman, R; Adhikari, K; Adikaram, D; An...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/173649
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