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. 2020 Oct 9;125(15):152002.
doi: 10.1103/PhysRevLett.125.152002.

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

F Afzal  1 , Y Wunderlich  1 , A V Anisovich  1   2 , D Bayadilov  1   2 , R Beck  1 , M Becker  1 , E Blanke  1 , K-Th Brinkmann  3 , S Ciupka  1 , V Crede  4 , M Dieterle  5 , H Dutz  6 , D Elsner  6 , S Friedrich  3 , F Frommberger  6 , A Gridnev  2 , M Gottschall  1 , M Grüner  1 , E Gutz  3 , C Hammann  1 , J Hannappel  6 , J Hartmann  1 , W Hillert  6 , J Hoff  1 , P Hoffmeister  1 , C Honisch  1 , T Jude  6 , H Kalinowsky  1 , F Kalischewski  1 , I Keshelashvili  5 , P Klassen  1 , F Klein  6 , E Klempt  1 , K Koop  1 , P Kroenert  1 , B Krusche  5 , M Lang  1 , I Lopatin  2 , P Mahlberg  1 , U-G Meißner  1   7 , F Messi  6 , V Metag  3 , W Meyer  8 , B Mitlasóczki  1 , J Müller  1 , J Müllers  1 , M Nanova  3 , K Nikonov  1   2 , V Nikonov  1   2 , V Novinskiy  2 , R Novotny  3 , D Piontek  1 , G Reicherz  8 , L Richter  1 , D Rönchen  1 , T Rostomyan  5 , B Salisbury  1 , A Sarantsev  1   2 , D Schaab  1 , C Schmidt  1 , H Schmieden  6 , J Schultes  1 , T Seifen  1 , V Sokhoyan  1 , C Sowa  8 , K Spieker  1 , N Stausberg  1 , A Thiel  1 , U Thoma  1 , T Triffterer  8 , M Urban  1 , G Urff  1 , H van Pee  1 , D Walther  1 , Ch Wendel  1 , U Wiedner  8 , A Wilson  1   4 , A Winnebeck  1 , L Witthauer  5 ; CBELSA/TAPS Collaboration
Affiliations

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

F Afzal et al. Phys Rev Lett. .

Abstract

Data on the beam asymmetry Σ in the photoproduction of η mesons 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 pη^{'} threshold [E_{γ}=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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