Nucleon resonances in the fourth-resonance region

  • A. V. Anisovich
  • E. Klempt
  • V. A. Nikonov
  • A. V. Sarantsev
  • U. Thoma
Regular Article - Theoretical Physics

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 JP = 1/2- and 3/2- . Since a spin partner with JP = 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 JP = 1/2+, 3/2+ spin doublet at 1900MeV belonging to a 20-plet is discussed.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • A. V. Anisovich
    • 1
    • 2
  • E. Klempt
    • 1
  • V. A. Nikonov
    • 1
    • 2
  • A. V. Sarantsev
    • 1
    • 2
  • U. Thoma
    • 1
  1. 1.Helmholtz-Institut für Strahlen- und KernphysikUniversität BonnBonnGermany
  2. 2.Petersburg Nuclear Physics InstituteGatchinaRussia

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