As a result of the analysis of collisions of carbon nuclei with carbon nuclei with an energy of 3.4 GeV per nucleon, a new resonance particle was found in the eight-quark system consisting of two protons and one pi-meson.
The detected short-lived particle has a mass of 2118 ± 1 MeV/c2, and its lifetime is shown to be relatively long compared to the time of the strong interaction (the width of the new resonant particle does not exceed 4 MeV/c2).
The experimental increase of the observed resonance structure from the background distribution was 122 ± 20 events or 4.5 standard errors (sigma).
The authors are analyzing other experimental data on nuclear collisions where the new particle could be observed.
