Journalartikel
Autorenliste: 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.; Gruener, 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.; Kroenert, P.; Lang, M.; Lazarev, A. B.; Livingston, K.; Lutterer, S.; Mahlberg, P.; Meier, C.; Meyer, W.; Mitlasoczki, B.; Muellers, J.; Nanova, M.; Neganov, A.; Nikonov, K.; Noel, J. F.; Ostrick, M.; Ottnad, J.; Otto, B.; Penman, G.; Poller, T.; Proft, D.; Reicherz, G.; Reinartz, N.; Richter, L.; Runkel, S.; Salisbury, B.; Sarantsev, A. V.; Schaab, D.; Schmidt, C.; Schmieden, H.; Schultes, J.; Seifen, T.; Spieker, K.; Stausberg, N.; Steinacher, M.; Taubert, F.; Thiel, A.; Thoma, U.; Thomas, A.; Urban, M.; Urff, G.; Usov, Y.; van Pee, H.; Wang, Y. C.; Wendel, C.; Wiedner, U.; Wunderlich, Y.
Jahr der Veröffentlichung: 2023
Zeitschrift: The European Physical Journal A
Bandnummer: 59
Heftnummer: 10
ISSN: 1434-6001
eISSN: 1434-601X
Open Access Status: Hybrid
DOI Link: https://doi.org/10.1140/epja/s10050-023-01134-0
Verlag: Springer
Abstract:
The target asymmetry T, recoil asymmetry P,and beam-target double polarization observable H were determined in exclusive pi(0)and eta 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 Bar-rel/TAPS detector setup, using a linearly polarized photonbeam 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 gamma p -> pi(0) p and gamma p -> eta preactions are confirmed.The data obtained on the neutron are of particular relevance for clarifying the origin of the narrow structure in the eta n system at W=1.68 GeV. A comparison with recent partial wave analyses favors the interpretation of this structure as arising from interference of the S-11(1535) and S-11 (1650) resonances within the S-11-partial wave.
Zitierstile
Harvard-Zitierstil: Jermann, N., Krusche, B., Metag, V., Afzal, F., Badea, M., Beck, R., et al. (2023) Measurement of polarization observables T, P, and H in π0and η photoproduction off quasi-free nucleons, The European Physical Journal A, 59(10), Article 232. https://doi.org/10.1140/epja/s10050-023-01134-0
APA-Zitierstil: 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., Ciupka, S., Crede, V., Dolzhikov, A., Drexler, P., Dutz, H., Elsner, D., ...Wunderlich, Y. (2023). Measurement of polarization observables T, P, and H in π0and η photoproduction off quasi-free nucleons. The European Physical Journal A. 59(10), Article 232. https://doi.org/10.1140/epja/s10050-023-01134-0
Schlagwörter
DEUTERON; ELECTROPRODUCTION; GAMMA-P; ISOBAR MODEL; MESONS; SPECTROMETER; WAVE
