Strong evidence for nucleon resonances near 1900 MeV

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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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
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 (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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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
653082Glasgow nuclear physics consolidated grantDavid IrelandScience & Technology Facilities Council (STFC)ST/L005719/1S&E P&A - PHYSICS & ASTRONOMY