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Nucleon resonances in the fourth-resonance region

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Abstract

Nucleon and \( \Delta\) resonances in the fourth-resonance region are studied in a multichannel partial-wave analysis which includes nearly all available data on pion- and photo-induced reactions off protons. In the high-mass range, above 1850MeV, several alternative solutions yield a good description of the data. For these solutions, masses, widths, pole residues and photocouplings are given. In particular, we find evidence for nucleon resonances with spin-parities \(\ensuremath J^{P}=1/2^{+},\ldots ,7/2^{+}\) . For one set of solutions, there are four resonances forming naturally a spin-quartet of resonances with orbital angular momentum L = 2 and spin S = 3/2 coupling to \(\ensuremath J=1/2,\ldots,7/2\) . Just below 1.9GeV we find a spin doublet of resonances with J P = 1/2- and 3/2- . Since a spin partner with J P = 5/2- is missing at this mass, the two resonances form a spin doublet which must have a symmetric orbital-angular-momentum wave function with L = 1 . For another set of solutions, the four positive-parity resonances are accompanied by mass-degenerate negative-parity partners --as suggested by the conjecture of chiral symmetry restoration. The possibility of a J P = 1/2+, 3/2+ spin doublet at 1900MeV belonging to a 20-plet is discussed.

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Authors and Affiliations

  1. Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Bonn, Germany

    A. V. Anisovich, E. Klempt, V. A. Nikonov, A. V. Sarantsev & U. Thoma

  2. Petersburg Nuclear Physics Institute, Gatchina, Russia

    A. V. Anisovich, V. A. Nikonov & A. V. Sarantsev

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  1. A. V. Anisovich
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  2. E. Klempt
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  3. V. A. Nikonov
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  4. A. V. Sarantsev
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Communicated by Z.-E. Meziani

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Anisovich, A.V., Klempt, E., Nikonov, V.A. et al. Nucleon resonances in the fourth-resonance region. Eur. Phys. J. A 47, 153 (2011). https://doi.org/10.1140/epja/i2011-11153-9

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