Abstract
Data on the reaction from the CLAS experiments are used to derive the leading multipoles, , , , and , 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 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 , , and in the region at about 1.9 GeV.
- Received 23 February 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.062004
© 2017 American Physical Society