Compatibility of a low-mass uuddss state with nuclear stability and the LZ event

Determine whether suppressions from strangeness-changing weak interactions and the small overlap between compact six-quark and ordinary two-baryon configurations can simultaneously accommodate the LZ candidate event through a uuddss state near 1.85 GeV while satisfying existing nuclear-stability constraints.

Background

The paper discusses a hypothetical invisible scalar baryon-number-two state with quark content uuddss and mass near 1.85 GeV, motivated by an interpretation of an LZ nuclear-recoil event. At this mass, transitions of nucleon pairs into the state could be energetically allowed in some nuclei, making nuclear stability a significant constraint.

Previous studies have proposed that such transitions may be suppressed by the required strangeness-changing weak interaction and by the small overlap between a compact six-quark state and ordinary two-baryon configurations. The present QCD sum-rule analysis does not calculate the relevant nuclear transition amplitudes, so it leaves this phenomenological compatibility unresolved.