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

. 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...

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Published in:The European physical journal. A, Hadrons and nuclei Hadrons and nuclei, 2011-02, Vol.47 (2), Article 27
Main Authors: Anisovich, A. V., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Thoma, U.
Format: Article
Language:English
Subjects:
Hadrons
Heavy Ions
Nuclear Fusion
Nuclear Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Regular Article - Experimental Physics
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Summary:. 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.
ISSN:1434-6001
1434-601X
DOI:10.1140/epja/i2011-11027-2