Observation of the p eta ` Cusp in the New Precise Beam Asymmetry Sigma Data for gamma p -> p eta

Afzal, F. and Wunderlich, Y. and Anisovich, A. V. and Bayadilov, D. and Beck, R. and Becker, M. and Blanke, E. and Brinkmann, K-Th and Ciupka, S. and Crede, V. and Dieterle, M. and Dutz, H. and Elsner, D. and Friedrich, S. and Frommberger, F. and Gridnev, A. and Gottschall, M. and Gruener, M. and Gutz, E. and Hammann, C. and Hannappel, J. and Hartmann, J. and Hillert, W. and Hoff, J. and Hoffmeister, P. and Honisch, C. and Jude, T. and Kalinowsky, H. and Kalischewski, F. and Keshelashvili, I. and Klassen, P. and Klein, F. and Klempt, E. and Koop, K. and Kroenert, P. and Krusche, B. and Lang, M. and Lopatin, I. and Mahlberg, P. and Meissner, U.-G. and Messi, F. and Metag, V. and Meyer, W. and Mitlasoczki, B. and Mueller, J. and Muellers, J. and Nanova, M. and Nikonov, K. and Nikonov, V. and Novinskiy, V. and Novotny, R. and Piontek, D. and Reicherz, G. and Richter, L. and Roenchen, D. and Rostomyan, T. and Salisbury, B. and Sarantsev, A. and Schaab, D. and Schmidt, C. and Schmieden, H. and Schultes, J. and Seifen, T. and Sokhoyan, V. and Sowa, C. and Spieker, K. and Stausberg, N. and Thiel, A. and Thoma, U. and Triffterer, T. and Urban, M. and Urff, G. and van Pee, H. and Walther, D. and Wendel, Ch and Wiedner, U. and Wilson, A. and Winnebeck, A. and Witthauer, L.. (2020) Observation of the p eta ` Cusp in the New Precise Beam Asymmetry Sigma Data for gamma p -> p eta. Physical Review Letters, 125 (15). p. 152002.

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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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:16 Feb 2021 15:23
Deposited On:16 Feb 2021 15:23

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