Eur. Phys. J. A 47, 27 (2011)
https://doi.org/10.1140/epja/i2011-11027-2

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

¹ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Bonn, Germany
² Petersburg Nuclear Physics Institute, Gatchina, Russia

klempt@hiskp.uni-bonn.de

Received: 26 October 2010
Accepted: 26 January 2011
Published online: 24 February 2011

Abstract

We report evidence for N(1710)P ₁₁ , N(1875)P ₁₁ , N(1900)P ₁₃ , (1600)P ₃₃ , (1910)P ₃₁ , and (1920)P ₃₃ , and find indications that N(1900)P ₁₃ might have a companion state at 1970MeV. The controversial (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 N scattering amplitudes from either KH84 or GWU. The two N amplitudes from KH84 or GWU, respectively, lead to slightly different N branching ratios of contributing resonances but the debated resonances are required in both series of fits.