Evidence of the non-strange partner of pentaquark from the elementary $K^+\Lambda$ photoproduction

TL;DR

This paper investigates a predicted non-strange pentaquark partner using new kaon photoproduction data, constructing models to identify a resonance at 1650 MeV and estimating related antidecuplet masses.

Contribution

It introduces phenomenological models to identify a specific pentaquark resonance and estimates masses of related antidecuplet members based on experimental data.

Findings

Resonance mass identified at approximately 1650 MeV

Constructed models successfully describe kaon photoproduction data

Estimated masses of other antidecuplet members

Abstract

The existence of the $J^p=1/2^+$ narrow resonance predicted by the chiral soliton model has been investigated by utilizing the new kaon photoproduction data. For this purpose, we have constructed two phenomenological models, which are able to describe kaon photoproduction from threshold up to W=1730 MeV. By varying the resonance mass, width, and $K\Lambda$ branching ratio in this energy range we found that the most convincing mass of this resonance is 1650 MeV. Using this result we estimate the masses of other antidecuplet family members.