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

Sep, 2010
22 pages
Published in:
  • Eur.Phys.J.A 47 (2011) 27
e-Print:

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Abstract: (arXiv)
We report evidence for N(1710)P11N(1710)P_{11}, N(1875)P11N(1875)P_{11}, N(1900)P13N(1900)P_{13}, Δ(1600)P33\Delta(1600)P_{33}, Δ(1910)P31\Delta(1910)P_{31}, and Δ(1920)P33\Delta(1920)P_{33}, and find indications that N(1900)P13N(1900)P_{13} might have a companion state at 1970\,MeV. The controversial Δ(1750)P31\Delta(1750)P_{31} 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 πN\pi N scattering amplitudes from either KH84 or GWU. The two πN\pi N amplitudes from KH84 or GWU, respectively, lead to slightly different πN\pi N branching ratios of contributing resonances but the debated resonances are required in both series of fits.
Note:
  • 22 pages, 28 figures. Some additional sets of data are added
  • 11.80.Gw
  • 14.20.Gk
  • 13.30.Ce
  • 11.80.Et
  • 13.60.Le
  • 13.30.-a
  • 13.30.Eg
  • hyperon: production
  • scattering amplitude
  • branching ratio