Properties of H particle-admixed compact star

Abstract We explore the potential manifestation of a hexaquark, the H particle, as a constituent within neutron stars. The H particle, with a quark content of uuddss , is constructed within the Chromomagnetic Interaction (CMI) framework. Specifically, we contemplate the flavor-singlet state H with $$J^P=0^+$$ J P = 0 + . Our computations indicate that the three-flavor hexaquark state, the H particle, possesses a lower mass of $$2212.7~\textrm{MeV}$$ 2212.7 MeV in comparison to the $$d^*(2380)$$ d ∗ ( 2380 ) , implying greater stability than the two-flavor $$d^*(2380)$$ d ∗ ( 2380 ) . The analysis involving the H particle is carried out using the relativistic mean-field (RMF) model. We investigate the influence of H particle couplings, a key factor in determining the system stability, and focus on the potential existence of H particle within neutron stars. We find that H particle could potentially endure as a stable constituent within neutron stars, and lead to a reduction of the maximum mass.