P -wave excited baryons from pion- and photo-induced hyperon production

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

Abstract.

We report evidence for N(1710)P11 , N(1875)P11 , N(1900)P13 , \( \Delta\)(1600)P33 , \( \Delta\)(1910)P31 , and \( \Delta\)(1920)P33 , and find indications that N(1900)P13 might have a companion state at 1970MeV. The controversial \( \Delta\)(1750)P31 is not seen. The evidence is derived from a study of data on pion- and photo-induced hyperon production, but other data are included as well. Most of the resonances reported here were found in the Karlsruhe-Helsinki (KH84) and the Carnegie-Mellon (CM) analyses but were challenged recently by the Data Analysis Center at GWU. Our analysis is constrained by the energy-independent \( \pi\)N scattering amplitudes from either KH84 or GWU. The two \( \pi\)N amplitudes from KH84 or GWU, respectively, lead to slightly different \( \pi\)N branching ratios of contributing resonances but the debated resonances are required in both series of fits.

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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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