Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-24
Eur.Phys.J.A47:27,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 28 figures. Some additional sets of data are added
Scientific paper
10.1140/epja/i2011-11027-2
We report evidence for $N(1710)P_{11}$, $N(1875)P_{11}$, $N(1900)P_{13}$, $\Delta(1600)P_{33}$, $\Delta(1910)P_{31}$, and $\Delta(1920)P_{33}$, and find indications that $N(1900)P_{13}$ might have a companion state at 1970\,MeV. The controversial $\Delta(1750)P_{31}$ 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 $\pi N$ 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.
Anisovich A. V.
Klempt Eberhard
Nikonov V. A.
Sarantsev A. V.
Thoma Ulrike
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