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Observation of the p eta ` Cusp in the New Precise Beam Asymmetry Sigma Data for gamma p -> p eta
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 4615989
Author(s) 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.
Author(s) at UniBasel Krusche, Bernd
Year 2020
Title Observation of the p eta ` Cusp in the New Precise Beam Asymmetry Sigma Data for gamma p -> p eta
Journal Physical Review Letters
Volume 125
Number 15
Pages / Article-Number 152002
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.
Publisher American Physical Society
ISSN/ISBN 0031-9007
edoc-URL https://edoc.unibas.ch/81874/
Full Text on edoc No
Digital Object Identifier DOI 10.1103/PhysRevLett.125.152002
ISI-Number 000576602100005
Document type (ISI) article
 
   

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