Partial-Wave Analysis of $\gamma p \rightarrow K^+ \Lambda$ using a multichannel framework

TL;DR

This paper performs a detailed partial-wave analysis of the gamma-proton to K-plus Lambda reaction, identifying key resonances and suggesting new ones consistent with quark-model predictions.

Contribution

It introduces a multichannel framework for partial-wave analysis, revealing several resonances and the necessity of specific amplitudes for accurate spin observable fits.

Findings

Identification of dominant resonances at various energies

Evidence for new resonances near 1880 MeV and 2300 MeV

Inclusion of predictions for gamma-neutron to K-zero Lambda reactions

Abstract

Results from a partial-wave analysis of the reaction $\gamma p \rightarrow K^+ \Lambda$ are presented. The reaction is dominated by the $S_{11}(1650)$ and $P_{13}(1720)$ resonances at low energies and by $P_{13}(1900)$ at higher energies. There are small contributions from all amplitudes up to and including $G_{17}$, with $F_{17}$ necessary for obtaining a good fit of several of the spin observables. We find evidence for $P_{11}$(1880), $D_{13}$(2120), and $D_{15}$(2080) resonances, as well as a possible $F_{17}$ resonance near 2300 MeV, which is expected from quark-model predictions. Some predictions for $\gamma n \to K^0 \Lambda$ are also included.