Study of isospin eigenstates of the pentaquark molecular states with strangeness

Abstract

In the paper, we construct eight color singlet–singlet-type five-quark currents with distinguished isospins to study the [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] molecular states with strangeness via the QCD sum rules. Numerical results show that the central values of the pentaquark masses with higher (lower) isospin are slightly above (below) the thresholds of the corresponding meson–baryon pairs, and support assigning the [Formula: see text] as the [Formula: see text] molecular state with the quantum numbers [Formula: see text]. The other predictions can be confronted to the experimental data in the future.