Anisovich, A. V. et al. (2017) Strong evidence for nucleon resonances near 1900 MeV. Physical Review Letters, 119(6), 062004. (doi: 10.1103/PhysRevLett.119.062004)
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Abstract
Data on the reaction γp → KþΛ from the CLAS experiments are used to derive the leading multipoles, E0þ, M1−, E1þ, and M1þ, from the production threshold to 2180 MeV in 24 slices of the invariant mass. The four multipoles are determined without any constraints. The multipoles are fitted using a multichannel L þ P model that allows us to search for singularities and to extract the positions of poles on the complex energy plane in an almost model-independent method. The multipoles are also used as additional constraints in an energy-dependent analysis of a large body of pion and photoinduced reactions within the Bonn-Gatchina partial wave analysis. The study confirms the existence of poles due to nucleon resonances with spin parity JP ¼ 1=2−, 1=2þ, and 3=2þ in the region at about 1.9 GeV
Item Type: | Articles |
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Status: | Published |
Refereed: | Yes |
Glasgow Author(s) Enlighten ID: | Ireland, Professor David |
Authors: | Anisovich, A. V., Burkert, V., Hadžimehmedović, M., Ireland, D.G., Klempt, E., Nikonov, V. A., Omerović, R., Osmanović, H., Sarantsev, A. V., Stahov, J., Švarc, A., and Thoma, U. |
College/School: | College of Science and Engineering > School of Physics and Astronomy |
Journal Name: | Physical Review Letters |
Publisher: | American Physical Society |
ISSN: | 0031-9007 |
ISSN (Online): | 1079-7114 |
Copyright Holders: | Copyright © 2017 American Physical Society |
First Published: | First published in Physical Review Letters 119(6):062004 |
Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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