@article{b2a0a8fa569346d388728eb35f285f30,
title = "First measurement of the polarization observable E in the p→(γ→,π+)n reaction up to 2.25 GeV",
abstract = "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, J{\"u}lich-Bonn, and SAID groups.",
keywords = "Baryon spectroscopy, FROST experiment, Pion photoproduction, Polarization observables",
author = "{CLAS Collaboration} and S. Strauch and Briscoe, {W. J.} and M. D{\"o}ring and E. Klempt and Nikonov, {V. A.} and E. Pasyuk and D. R{\"o}nchen and Sarantsev, {A. V.} and I. Strakovsky and R. Workman and Adhikari, {K. P.} and D. Adikaram and Anderson, {M. D.} and {Anefalos Pereira}, S. and Anisovich, {A. V.} and Badui, {R. A.} and J. Ball and V. Batourine and M. Battaglieri and I. Bedlinskiy and N. Benmouna and Biselli, {A. S.} and J. Brock and Brooks, {W. K.} and Burkert, {V. D.} and T. Cao and C. Carlin and Carman, {D. S.} and A. Celentano and S. Chandavar and G. Charles and L. Colaneri and Cole, {P. L.} and N. Compton and M. Contalbrigo and O. Cortes and V. Crede and N. Dashyan and A. D'Angelo and {De Vita}, R. and {De Sanctis}, E. and A. Deur and C. Djalali and M. Dugger and R. Dupre and H. Egiyan and {El Alaoui}, A. and {El Fassi}, L. and L. Elouadrhiri and Jo, {H. S.}",
note = "Publisher Copyright: {\textcopyright} 2015 The Authors.",
year = "2015",
month = nov,
day = "12",
doi = "10.1016/j.physletb.2015.08.053",
language = "English",
volume = "750",
pages = "53--58",
journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",
issn = "0370-2693",
publisher = "Elsevier B.V.",
}