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arXiv · 1009.4803

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

A. V. Anisovich·E. Klempt·V. A. Nikonov·A. V. Sarantsev·U. Thoma
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Abstract

We report evidence for $N(1710)P_{11}$, $N(1875)P_{11}$, $N(1900)P_{13}$, $Δ(1600)P_{33}$, $Δ(1910)P_{31}$, and $Δ(1920)P_{33}$, and find indications that $N(1900)P_{13}$ might have a companion state at 1970\,MeV. The controversial $Δ(1750)P_{31}$ 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 $πN$ scattering amplitudes from either KH84 or GWU. The two $πN$ amplitudes from KH84 or GWU, respectively, lead to slightly different $πN$ branching ratios of contributing resonances but the debated resonances are required in both series of fits.

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A. V. Anisovich, E. Klempt, V. A. Nikonov, A. V. Sarantsev, U. Thoma. 2010-10-28. P-wave excited baryons from pion- and photo-induced hyperon production. https://doi.org/10.1140/epja%2Fi2011-11027-2

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