Search for an Isospin I =3 Dibaryon

TL;DR

This paper reports a search for a hypothesized I=3 dibaryon resonance using proton-proton collision data, setting upper limits on its production due to lack of clear evidence.

Contribution

It provides the first experimental search for an I=3 dibaryon resonance in proton-proton collisions and establishes upper limits on its production cross section.

Findings

No clear evidence of the I=3 dibaryon resonance was found.

Upper limits for the production cross section were established.

The search covered a mass range of 2280 - 2500 MeV.

Abstract

Various theoretical calculations based on QCD or hadronic interactions predict that in addition to the recently observed dibaryon resonance $d^*(2380)$ with $I(J^P) = 0(3^+)$ there should also exist a dibaryon resonance with mirrored quantum numbers $I(J^P) = 3(0^+)$. We report here on a search for such a $NN$-decoupled state in data on the $pp \to pp\pi^+\pi^+\pi^-\pi^-$ reaction. Since no clear-cut evidence has been found, we give upper limits for the production cross section of such a resonance in the mass range 2280 - 2500 MeV.