The Search and Study of Low-mass Scalar Mesons in the Reaction $np --> np\pi^+\pi^-$ at Pn=3.83 Gev/c

TL;DR

This study investigates low-mass scalar mesons in the $ p o p\pi^+\pi^-$ reaction at 3.83 GeV/c, identifying a resonance with spin 0 and significant statistical deviation, contributing to understanding meson properties.

Contribution

It is the first to identify a scalar $\sigma_0 0^+[0^{++}]$ meson resonance in this reaction at this energy, with estimated quantum numbers and statistical significance.

Findings

Resonance with high statistical deviation detected in mass distribution

Estimated quantum numbers indicate a spin 0 resonance

Resonance significance exceeds four standard deviations

Abstract

This work is devoted to search and study scalar $\sigma_0 0^+[0^++]$ - mesons in the system of $\pi^+\pi^-$ from the reaction $np -> np\pi^+\pi^-$ at the impulse of the quasimonochromatic neutrons c from the data obtained in an exposure of the 1m H2 bubble chamber of LHE (JINR)The resonance with and has been found out in effective mass distribution. Value of a statistical deviation of this peculiarity from a background is more than four. Spin of the resonance has been estimated, which, with high probability, is equal 0. The other quantum numbers of the resonance have been estimated.