Strange partners of the doubly charmed tetraquark Tcc+

Abstract

The spectroscopic parameters and widths of the axial-vector T-cc:s(AV) and scalar T-cc:s(S), (T) over tilde (S)(cc:s) strange partners of the doubly charmed exotic meson T-cc(+) with the content ccus, are calculated in the framework of the QCD sum rule method. We model T AV cc:s as the diquark-antidiquark state composed of axial-vector and scalar components, whereas scalar particles T-cc:s(AV) and (T) over tilde (S)(cc:s) are built of axial-vector and scalar diquarks, respectively. The masses and current couplings of these tetraquarks are calculated in the context of the two-point sum rule approach by taking into account the quark, gluon and mixed condensates up to dimension 10. The full width of the state T AV cc:s is found from analysis of the processes T-cc:s(AV) -> (DDs)-D-0*(+) and T-cc:s(AV) -> D*(2007)D-0(s)+. Decays to (DDs+)-D-0, D*( 2007)D-0(s)*+ and (DDs+)-D-0 mesons are utilized in the case of the scalar tetraquarks T-cc:s(S) and (T) over tilde (S)(cc:s), respectively. The partial widths of the aforementioned decays are determined via the strong couplings g1, g2, G1, G2 and (G) over tilde, which describe the strong interactions of the particles at the relevant tetraquark-meson-meson vertices. These couplings are computed using the QCD three-point sum rule method, most appropriate for the strong decays under study. The predictions m = (3995 +/- 143) MeV and Gamma(AV) = (72 +/- 13) MeV, as well as m(S) = (4128 +/- 142) MeV, Gamma S = (213 +/- 47) MeV and (m) over tildeS = (4035 +/- 145) MeV and (Gamma) over tilde (S) = (123 +/- 32) MeV obtained for the masses and widths of these tetraquarks in the present work can be useful in future experimental investigations of the doubly charmed four-quark resonances.