Analysis of Zcs (3985) as the axialvector tetraquark state

In this study, we choose the scalar and axialvector diquark operators in the color antitriplet as the fundamental building blocks to construct four-quark currents and investigate the diquark-antidiquark type axialvector tetraquark states c (c) over baru (s) over bar in the framework of the QCD sum rules. The predicted tetraquark mass M-Z = 3.99 +/- 0.09 is in excellent agreement with the experimental value 3985.2(-2.0)(+2.1) +/- 1.7 MeV from the BESIII collaboration, which supports identifying Z(cs)(3985) as the cousin of Z(c)(3900) with quantum numbers J(PC) = 1(+-). We take into account the light flavor mass-breaking effect to estimate the mass spectrum of the diquark-antidiquark type hidden-charm tetraquark states with strangeness according to previous studies.

Automated summary

The study utilized scalar and axialvector diquark operators to construct four-quark currents and investigated diquark-antidiquark type axialvector tetraquark states. The predicted tetraquark mass closely matched the experimental value, supporting the identification of Z(cs)(3985) as a relative of Z(c)(3900). Consideration of flavor mass-breaking effect was included in estimating the mass spectrum of diquark-antidiquark type hidden-charm tetraquark states with strangeness.