The Observation of Exotic Resonances for $\Lambda \gamma $,$\Lambda\pi^{\pm}$,$\Lambda \pi^+\pi^-$, $\Lambda p$, $\Lambda pp$ and $p \gamma$ Spectra in p + a Collision at 10 Gev/c

TL;DR

This paper reports the observation of exotic resonances in various $ ext{Lambda}$-related spectra from proton collisions at 10 GeV/c, revealing potential new states and medium effects in strange baryonic matter.

Contribution

It presents new experimental evidence of exotic narrow resonances and medium modifications in strange baryonic systems from proton-nucleus collisions.

Findings

Observation of $ ext{Sigma}^0$, $ ext{Sigma}^{*+}$(1385), and $K^{* ext{±}}$(892) resonances.

Mass shift and increased width of $ ext{Sigma}^{*-}(1385)$ resonance.

Enhancement signals in $ ext{Lambda}^*(1600)$, $ ext{Lambda}^*(1750)$, and $ ext{Lambda}^*(1850)$ spectra.

Abstract

Strange multi-baryonic clusters are an exiting possibility to explore the properties of cold dense baryonic matter. Recent results on searches for exotic narrow resonances with $\Lambda$ hyperon subsystems are reviewed. The observation of $\Sigma^0$, $\Sigma^{*+}$(1385) and $K^{*\pm}$(892) well known resonances from PDG are a good tests of this method. The mean value of mass for $\Sigma^{*-}(1385)$ resonance is shifted till mass of 1370 MeV/$c^2$ and width is two times larger than same value from PDG. Such of behavior for width and mass of $\Sigma^{*-}(1385)$ resonance interpreted as extensive contribution from stopping $\Xi^-\to\Lambda\pi^-$ and medium effect with mass of $\Sigma^{*-}(1385)$ resonance.In ($\Lambda\pi^+ \pi^-$) spectrum there are observed enhancement signals from $\Lambda ^*(1600)$, $\Lambda ^*(1750)$ and $\Lambda ^*(1850)$ resonances. A number of significant signals were found in the effective mass spectra of: 1)$\Lambda \gamma$,$p \gamma$ $\Lambda \pi^{\pm}$,$\Lambda \pi \pi$, $\Lambda p$ and $\Lambda p p$ subsystems.