Abstract
A study of the partial-wave content of the γp→η′p reaction in the fourth resonance region is presented, which has been prompted by new measurements of polarization observables for that process. Using the Bonn–Gatchina partial-wave formalism, the incorporation of new data indicates that the N(1895)1/2−, N(1900)3/2+, N(2100)1/2+, and N(2120)3/2− are the most significant contributors to the photoproduction process. New results for the branching ratios of the decays of these more prominent resonances to Nη′ final states are provided; such branches have not been indicated in the most recent edition of the Review of Particle Properties. Based on the analysis performed here, predictions for the helicity asymmetry E for the γp→η′p reaction are presented.
Highlights
The cross section for pion-nucleon elastic scattering as a function of center-of-mass energy W reveals four distinct but broad energy ranges where enhancements are observed, which are called resonance regions
At 1900 ≤ W ≤ 2100 MeV, the fourth resonance region appears as a small peak-like structure in the total πN cross section, which is largely due to the ∆(1950) 7/2+ excitation with substantial contributions from other ∆∗ resonances
Photoproduction of η′-mesons offers the chance to search for low-spin high-mass nucleon resonances in the region above W = 1900 MeV
Summary
The cross section for pion-nucleon elastic scattering as a function of center-of-mass energy W reveals four distinct but broad energy ranges where enhancements are observed, which are called resonance regions. The CLAS collaboration [13] measured Σ over an extended mass range from threshold up to 2092 MeV These new data on Σ stimulated us to study the partial-wave content of the γp → η′p reaction using a model that describes simultaneously data for the photoproduction of other mesons as well. Such multi-channel analyses can provide great insight into the nucleon resonance spectrum since the strengths of the decay modes for the various resonances participating in the process vary greatly from one final state to another. Where gγ(αN) are resonance couplings and Fa describes the non-resonant transition
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