Observation of the p η ′ Cusp in the New Precise Beam Asymmetry Σ Data for γ p → p η

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

doi:10.1103/PhysRevLett.125.152002

%0 Journal Article
%A Afzal, F.
%A Wunderlich, Y.
%A Anisovich, A. V.
%A Bayadilov, D.
%A Beck, R.
%A Becker, M.
%A Blanke, E.
%A Brinkmann, K.-Th.
%A Ciupka, S.
%A Crede, V.
%A Dieterle, M.
%A Dutz, H.
%A Elsner, D.
%A Friedrich, S.
%A Frommberger, F.
%A Gridnev, A.
%A Gottschall, M.
%A Grüner, M.
%A Gutz, E.
%A Hammann, C.
%A Hannappel, J.
%A Hartmann, J.
%A Hillert, W.
%A Hoff, J.
%A Hoffmeister, P.
%A Honisch, C.
%A Jude, T.
%A Kalinowsky, H.
%A Kalischewski, F.
%A Keshelashvili, I.
%A Klassen, P.
%A Klein, F.
%A Klempt, E.
%A Koop, K.
%A Kroenert, P.
%A Krusche, B.
%A Lang, M.
%A Lopatin, I.
%A Mahlberg, P.
%A Meißner, U.-G.
%A Messi, F.
%A Metag, V.
%A Meyer, W.
%A Mitlasóczki, B.
%A Müller, J.
%A Müllers, J.
%A Nanova, M.
%A Nikonov, K.
%A Nikonov, V.
%A Novinskiy, V.
%A Novotny, R.
%A Piontek, D.
%A Reicherz, G.
%A Richter, L.
%A Rönchen, Deborah
%A Rostomyan, T.
%A Salisbury, B.
%A Sarantsev, A.
%A Schaab, D.
%A Schmidt, C.
%A Schmieden, H.
%A Schultes, J.
%A Seifen, T.
%A Sokhoyan, V.
%A Sowa, C.
%A Spieker, K.
%A Stausberg, N.
%A Thiel, A.
%A Thoma, U.
%A Triffterer, T.
%A Urban, M.
%A Urff, G.
%A van Pee, H.
%A Walther, D.
%A Wendel, Ch.
%A Wiedner, U.
%A Wilson, A.
%A Winnebeck, A.
%A Witthauer, L.
%T Observation of the p η ′ Cusp in the New Precise Beam Asymmetry Σ Data for γ p → p η
%J Physical review letters
%V 125
%N 15
%@ 1079-7114
%C College Park, Md.
%I APS
%M FZJ-2021-00145
%P 152002
%D 2020
%X 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 [Eγ=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)12− nucleon resonance, demonstrating the importance of including all singularities for a correct determination of partial waves and resonance parameters.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ 33095637
%U <Go to ISI:>//WOS:000576602100005
%R 10.1103/PhysRevLett.125.152002
%U https://juser.fz-juelich.de/record/889240

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