New data on (gamma)over-right-arrow(p)over-right-arrow -> eta p with polarized photons and protons and their implications for N* -> N eta decays

Müller, J. and Hartmann, J. and Grüner, M. and Afzal, F. and Anisovich, V. and Bantes, B. and Bayadilov, D. and Beck, R. and Becker, M. and Beloglazov, Y. and Berlin, A. and Bichow, M. and Böse, S. and Brinkmann, K.-T. and Challand, T. and Crede, V. and Dietz, F. and Dieterle, M. and Drexler, P. and Dutz, H. and Eberhardt, H. and Elsner, D. and Ewald, R. and Fornet-Ponse, K. and Friedrich, S. and Frommberger, F. and Funke, C. and Gottschall, M. and Gridnev, A. and Goertz, S. and Gutz, E. and Hammann, C. and Hannen, V. and Hannappel, J. and Herick, J. and Hillert, W. and Hoffmeister, P. and Honisch, C. and Jahn, O. and Jude, T. and Jaegle, I. and Käser, A. and Kaiser, D. and Kalinowsky, H. and Kalischewski, F. and Kammer, S. and Keshelashvili, I. and Klassen, P. and Kleber, V. and Klein, F. and Klempt, E. and Koop, K. and Krusche, B. and Kube, M. and Lang, M. and Lopatin, I. and Maghrbi, Y. and Mahlberg, P. and Makonyi, K. and Messi, F. and Metag, V. and Meyer, W. and Müllers, J. and Nanova, M. and Nikonov, V. and Novinski, D. and Novotny, R. and Piontek, D. and Reicherz, G. and Rosenbaum, C. and Rostomyan, T. and Roth, B. and Sarantsev, A. and Schmidt, C. and Schmieden, H. and Schmitz, R. and Seifen, T. and Sokhoyan, V. and Thiel, A. and Thoma, U. and Urban, M. and van Pee, H. and Walther, D. and Wendel, C. and Wiedner, U. and Wilson, A. and Winnebeck, A. and Witthauer, L.. (2020) New data on (gamma)over-right-arrow(p)over-right-arrow -> eta p with polarized photons and protons and their implications for N* -> N eta decays. Physics Letters B, 803. p. 135323.

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The polarization observables T, E, P, H, and G in photoproduction of eta mesons off protons are measured for photon energies from threshold to W = 2400 MeV (T), 2280 MeV (E), 1620 MeV (P, H), or 1820 MeV (G), covering nearly the full solid angle. The data are compared to predictions from the SAID, MAID, JuBo, and BnGa partial-wave analyses. A refit within the BnGa approach including further data yields precise branching ratios for the N eta decay of nucleon resonances. A N eta-branching ratio of 0.33 +/- 0.04 for N(1650)1/2(-) is found, which reduces the large and controversially discussed N eta-branching ratio difference of the two lowest mass J(P) = 1/2(-) -resonances significantly. (C) 2020 The Authors. Published by Elsevier B.V.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:15 Feb 2021 16:13
Deposited On:15 Feb 2021 16:13

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