Observation of charged kappa in J/psi -> K*(892)-+Kspi+-, K*(892)-+ -> Kspi-+ at BESII

TL;DR

This paper reports the observation of a charged kappa particle in J/psi decays using BESII data, providing measurements of its mass, width, and pole position, consistent with the neutral kappa.

Contribution

First observation of a charged kappa particle in J/psi decays with detailed measurements of its properties.

Findings

Charged kappa observed with specific mass and width.

Measured pole position consistent with neutral kappa.

Supports existence of charged scalar meson.

Abstract

Using 58 million J/psi decays obtained by BESII, a charged kappa particle is observed in the analysis of the Kspi+- system recoiling against K*(892)-+ selected in J/psi -> KsKspi+pi-. The mass and width values of the charged kappa are obtained to be (826+-49_{-34}^{+49}) MeV/c^2 and (449+-156_{-81}^{+144}) MeV/c^2 for the Breit-Wigner parameters, and the pole position is determined to be (764+-63_{-54}^{+71})-i(306+-149_{-85}^{+143}) MeV/c^2. They are in good agreement with those of the neutral kappa observed by the BES collaboration.