Observation of the pη^{'} Cusp in the New Precise Beam Asymmetry Σ Data for γp→pη.

F Afzal,Y Wunderlich,A V Anisovich,D Bayadilov,R Beck, M Becker, E Blanke,K-Th Brinkmann, S Ciupka,V Crede,M Dieterle,H Dutz,D Elsner,S Friedrich,F Frommberger,A Gridnev, M Gottschall, M Grüner,E Gutz, C Hammann,J Hannappel,J Hartmann, W Hillert, J Hoff, P Hoffmeister, C Honisch, T Jude,H Kalinowsky, F Kalischewski,I Keshelashvili,P Klassen,F Klein,E Klempt,K Koop, P Kroenert, B Krusche,M Lang, I Lopatin, P Mahlberg,U-G Meißner,F Messi, V Metag,W Meyer, B Mitlasóczki,J Müller, J Müllers, M Nanova, K Nikonov,V Nikonov, V Novinskiy,R Novotny, D Piontek, G Reicherz, L Richter,D Rönchen, T Rostomyan, B Salisbury, A Sarantsev, D Schaab,C Schmidt, H Schmieden, J Schultes, T Seifen,V Sokhoyan,C Sowa, K Spieker, N Stausberg,A Thiel,U Thoma, T Triffterer,M Urban, G Urff,H van Pee,D Walther,Ch Wendel,U Wiedner,A Wilson, A Winnebeck,L Witthauer

PHYSICAL REVIEW LETTERS（2020）

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摘要

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.

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