Journal Article

FZJ-2021-00145

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Observation of the p η ′ Cusp in the New Precise Beam Asymmetry Σ Data for γ p → p η

Afzal, F. (Corresponding author) ; Wunderlich, Y. ; Anisovich, A. V. ; Bayadilov, D. ; Beck, R. ; Becker, M. ; Blanke, E. ; Brinkmann, K.-T. ; Ciupka, S. ; Crede, V. ; Dieterle, M. ; Dutz, H. ; Elsner, D. ; Friedrich, S. ; Frommberger, F. ; Gridnev, A. ; Gottschall, M. ; Grüner, 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.FZJ* ; Klassen, P. ; Klein, F. ; Klempt, E. ; Koop, K. ; Kroenert, P. ; Krusche, B. ; Lang, M. ; Lopatin, I. ; Mahlberg, P. ; Meißner, U.-G.FZJ* ; Messi, F. ; Metag, V. ; Meyer, W. ; Mitlasóczki, B. ; Müller, J. ; Müllers, J. ; Nanova, M. ; Nikonov, K. ; Nikonov, V. ; Novinskiy, V. ; Novotny, R. ; Piontek, D. ; Reicherz, G. ; Richter, L. ; Rönchen, D.FZJ* ; 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, C. ; Wiedner, U. ; Wilson, A. ; Winnebeck, A. ; Witthauer, L.

2020
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/26713  doi:10.1103/PhysRevLett.125.152002

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 [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.

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)
2. DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2020

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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