Barionic Resonances with Positive Strangeness S=+1 in the System nK+ from the Reaction np -> npK+K- at the Momentum of Incident Neutrons Pn=5.20 Gev/c

TL;DR

This study investigates baryonic resonances with positive strangeness S=+1 in the nK+ system produced in neutron-proton collisions at 5.20 GeV/c, revealing peculiar mass spectrum features and constructing a rotational band of resonances.

Contribution

It presents the first detailed analysis of S=+1 baryonic resonances in np collisions at this energy, including mass spectrum peculiarities and resonance spin estimations.

Findings

Identification of peculiar features in the nK+ effective mass spectrum.

Estimation of resonance spins and construction of a rotational band.

Resonance widths are comparable to the experimental mass resolution.

Abstract

The production and properties of the resonances with the strangeness S=+1 in the system of nK+ were studied in the reaction np->npK+K- at the momentum of incident neutrons Pn=(5.20 +/- 0.12)GeV/c. A number of peculiarities were found in the effective mass spectrum of the mentioned above system. Their widths are comparable with the mass resolution. The estimation of the spins of resonances was carried out and the rotational band connecting the resonances masses and their spins was constructed.