Appropriate observables for investigating narrow resonances in kaon photoproduction off a proton

TL;DR

This paper identifies key observables such as hyperon polarization and specific polarization asymmetries for detecting a narrow resonance at 1650 MeV in kaon photoproduction off a proton, guiding future experiments.

Contribution

It proposes specific observables for investigating a predicted narrow resonance in kaon photoproduction, aiding experimental searches.

Findings

Resonance mass estimated at 1650 MeV

Recommends polarization observables for detection

Guides future low-energy kaon photoproduction experiments

Abstract

The existence of non-strange partner of pentaquark, the J^p = 1/2^+ narrow resonance, has been investigated by utilizing kaon photoproduction off a proton. It is found that the corresponding mass is 1650 MeV and the appropriate observables for investigating this resonance are the recoiled hyperon polarization, the beam-recoil double polarization C_x, and differential cross section at backward angles. Future kaon photoproduction experiments at low energies should focus on these observables.