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Updated: Dec 4, 2025

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Observation of the pη^{'} Cusp in the New Precise Beam Asymmetry Σ Data for γp→pη
F Afzal1, Y Wunderlich1, A V Anisovich1,2
1Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Germany.
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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