Journal article
Authors list: Afzal, F.; Wunderlich, Y.; Anisovich, A., V; Bayadilov, D.; Beck, R.; Becker, M.; Blanke, E.; Brinkmann, K-Th; Ciupka, S.; Crede, V; Dieterle, M.; Dutz, H.; Elsner, D.; Friedrich, S.; Frommberger, F.; Gridnev, A.; Gottschall, M.; Gruener, M.; Gutz, E.; Hammann, C.; Hannappel, J.; Hartmann, J.; Hillert, W.; Hoff, J.; Hoffmeister, P.; Honisch, C.; Jude, T.; Kalinowsky, H.; Kalischewski, F.; Keshelashvili, I; Klassen, P.; Klein, F.; Klempt, E.; Koop, K.; Kroenert, P.; Krusche, B.; Lang, M.; Lopatin, I; Mahlberg, P.; Meissner, U-G; Messi, F.; Metag, V; Meyer, W.; Mitlasoczki, B.; Mueller, J.; Muellers, J.; Nanova, M.; Nikonov, K.; Nikonov, V; Novinskiy, V; Novotny, R.; Piontek, D.; Reicherz, G.; Richter, L.; Roenchen, D.; Rostomyan, T.; Salisbury, B.; Sarantsev, A.; Schaab, D.; Schmidt, C.; Schmieden, H.; Schultes, J.; Seifen, T.; Sokhoyan, V; Sowa, C.; Spieker, K.; Stausberg, N.; Thiel, A.; Thoma, U.; Triffterer, T.; Urban, M.; Urff, G.; van Pee, H.; Walther, D.; Wendel, Ch; Wiedner, U.; Wilson, A.; Winnebeck, A.; Witthauer, L.
Publication year: 2020
Journal: Physical Review Letters
Volume number: 125
Issue number: 15
ISSN: 0031-9007
eISSN: 1079-7114
Open access status: Green
DOI Link: https://doi.org/10.1103/PhysRevLett.125.152002
Publisher: American Physical Society
Abstract:
Data on the beam asymmetry Sigma in the photoproduction of eta esons off protons are reported for tagged photon energies from 1130 to 1790 MeV (mass range from W = 1748 MeV to W = 2045 MeV). The data cover the full solid angle that allows for a precise moment analysis. For the first time, a strong cusp effect in a polarization observable has been observed that is an effect of a branch-point singularity at the p.0 threshold [E-gamma = 1447 MeV (W = 1896 MeV)]. The latest BnGa partial wave analysis includes the new beam asymmetry data and yields a strong indication for the N(1895)(1/2)(-) nucleon resonance, demonstrating the importance of including all singularities for a correct determination of partial waves and resonance parameters.
Citation Styles
Harvard Citation style: Afzal, F., Wunderlich, Y., Anisovich, A., Bayadilov, D., Beck, R., Becker, M., et al. (2020) Observation of the pη′ Cusp in the New Precise Beam Asymmetry Σ Data for γp → pη, Physical Review Letters, 125(15), Article 152002. https://doi.org/10.1103/PhysRevLett.125.152002
APA Citation style: Afzal, F., Wunderlich, Y., Anisovich, A., Bayadilov, D., Beck, R., Becker, M., Blanke, E., Brinkmann, K., Ciupka, S., Crede, V., Dieterle, M., Dutz, H., Elsner, D., Friedrich, S., Frommberger, F., Gridnev, A., Gottschall, M., Gruener, M., Gutz, E., ...Witthauer, L. (2020). Observation of the pη′ Cusp in the New Precise Beam Asymmetry Σ Data for γp → pη. Physical Review Letters. 125(15), Article 152002. https://doi.org/10.1103/PhysRevLett.125.152002
Keywords
ELSA; PHOTOPRODUCTION; PROTON; SPECTROMETER
