The preliminary result from spectra of $K^0_s \pi^-$ in reaction p+propane at 10 GeV/c

TL;DR

This study analyzes propane bubble chamber data at 10 GeV/c to identify scalar meson resonances in the $K^0_s o ext{pi}$ decay channel, revealing structures at 730 and 900 MeV/c$^2$ with high statistical significance.

Contribution

First analysis of $K^0_s o ext{pi}$ spectra in p+propane collisions at 10 GeV/c to search for scalar meson ${ ext{Kappa}}(800)$.

Findings

Resonant structures observed at 730 and 900 MeV/c$^2$ in the $K^0_s ext{pi}$ spectrum.

Statistical significance of 14.2$\sigma$ and 4.2$\sigma$ for the peaks.

The peak at 900 MeV/c$^2$ is identified as a reflection from the known $K^*(892)$ resonance.

Abstract

The experimental data from 2m propane bubble chamber have been analyzed to search for scalar meson $\kappa(800)$ in a $K^0_s\pi$ decay mode for the reaction p+$C_3H_8$ at 10 GeV/c. The $K^0_s\pi^-$ invariant mass spectrum has shown resonant structures with $M_{K^0_s\pi^-}$=730, 900 and $\Gamma$=143, 48 MeV/$c^2$, respectively. The statistical significance are estimated to be of 14.2$\sigma$ and 4.2$\sigma$, respectively. The peak in M(900) is identified as reflection from the well known resonance with mass of 892 MeV/c$^2$.