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Measurement of polarization observables T, P, and H in π0 and η photoproduction off quasi-free nucleons.
Jermann, N; Krusche, B; Metag, V; Afzal, F; Badea, M; Beck, R; Bielefeldt, P; Bieling, J; Biroth, M; Blanke, E; Borisov, N; Bornstein, M; Brinkmann, K-T; Ciupka, S; Crede, V; Dolzhikov, A; Drexler, P; Dutz, H; Elsner, D; Fedorov, A; Frommberger, F; Gardner, S; Ghosal, D; Goertz, S; Gorodnov, I; Grüner, M; Hammann, C; Hartmann, J; Hillert, W; Hoffmeister, P; Honisch, C; Jude, T C; Kalischewski, F; Ketzer, B; Klassen, P; Klein, F; Klempt, E; Knaust, J; Kolanus, N; Kreit, J; Krönert, P; Lang, M; Lazarev, A B; Livingston, K; Lutterer, S; Mahlberg, P; Meier, C; Meyer, W; Mitlasoczki, B; Müllers, J.
Affiliation
  • Jermann N; Department of Physics, University of Basel, Basel, Switzerland.
  • Krusche B; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Metag V; Department of Physics, University of Basel, Basel, Switzerland.
  • Afzal F; II. Physikalisches Institut, University of Giessen, Giessen, Germany.
  • Badea M; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Beck R; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Bielefeldt P; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Bieling J; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Biroth M; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Blanke E; Institut für Kernphysik, University of Mainz, Mainz, Germany.
  • Borisov N; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Bornstein M; Joint Institute for Nuclear Research, Dubna, Russia.
  • Brinkmann KT; Physikalisches Institut, University of Bonn, Bonn, Germany.
  • Ciupka S; II. Physikalisches Institut, University of Giessen, Giessen, Germany.
  • Crede V; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Dolzhikov A; Department of Physics, Florida State University, Tallahassee, USA.
  • Drexler P; Joint Institute for Nuclear Research, Dubna, Russia.
  • Dutz H; Institut für Kernphysik, University of Mainz, Mainz, Germany.
  • Elsner D; Physikalisches Institut, University of Bonn, Bonn, Germany.
  • Fedorov A; Physikalisches Institut, University of Bonn, Bonn, Germany.
  • Frommberger F; Joint Institute for Nuclear Research, Dubna, Russia.
  • Gardner S; Physikalisches Institut, University of Bonn, Bonn, Germany.
  • Ghosal D; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, UK.
  • Goertz S; Department of Physics, University of Basel, Basel, Switzerland.
  • Gorodnov I; Present Address: resent address: University of Liverpool, Liverpool, UK.
  • Grüner M; Physikalisches Institut, University of Bonn, Bonn, Germany.
  • Hammann C; Joint Institute for Nuclear Research, Dubna, Russia.
  • Hartmann J; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Hillert W; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Hoffmeister P; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Honisch C; Physikalisches Institut, University of Bonn, Bonn, Germany.
  • Jude TC; Present Address: resent address: University of Hamburg, Hamburg, Germany.
  • Kalischewski F; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Ketzer B; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Klassen P; Physikalisches Institut, University of Bonn, Bonn, Germany.
  • Klein F; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Klempt E; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Knaust J; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Kolanus N; Physikalisches Institut, University of Bonn, Bonn, Germany.
  • Kreit J; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Krönert P; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Lang M; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Lazarev AB; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Livingston K; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Lutterer S; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
  • Mahlberg P; Joint Institute for Nuclear Research, Dubna, Russia.
  • Meier C; SUPA School of Physics and Astronomy, University of Glasgow, Glasgow, UK.
  • Meyer W; Department of Physics, University of Basel, Basel, Switzerland.
  • Mitlasoczki B; Present Address: resent address: Ruhr University Bochum, Bochum, Germany.
  • Müllers J; Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, Bonn, Germany.
Eur Phys J A Hadron Nucl ; 59(10): 232, 2023.
Article in En | MEDLINE | ID: mdl-37860634
ABSTRACT
The target asymmetry T, recoil asymmetry P, and beam-target double polarization observable H were determined in exclusive π0 and η photoproduction off quasi-free protons and, for the first time, off quasi-free neutrons. The experiment was performed at the electron stretcher accelerator ELSA in Bonn, Germany, with the Crystal Barrel/TAPS detector setup, using a linearly polarized photon beam and a transversely polarized deuterated butanol target. Effects from the Fermi motion of the nucleons within deuterium were removed by a full kinematic reconstruction of the final state invariant mass. A comparison of the data obtained on the proton and on the neutron provides new insight into the isospin structure of the electromagnetic excitation of the nucleon. Earlier measurements of polarization observables in the γp→π0p and γp→ηp reactions are confirmed. The data obtained on the neutron are of particular relevance for clarifying the origin of the narrow structure in the ηn system at W=1.68GeV. A comparison with recent partial wave analyses favors the interpretation of this structure as arising from interference of the S11(1535) and S11(1650) resonances within the S11-partial wave.
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Eur Phys J A Hadron Nucl Year: 2023 Document type: Article Affiliation country: Suiza
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Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Eur Phys J A Hadron Nucl Year: 2023 Document type: Article Affiliation country: Suiza