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
Received:
26
October
2010
Accepted:
26
January
2011
Published online:
24
February
2011
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.
© SIF, Springer-Verlag Berlin Heidelberg, 2011