The doubly charmed pseudoscalar tetraquarks Tcc;(s)over-bar(s)over-bar++ and Tcc;(d)over-bar<(s)over bar>++

The mass and coupling of the doubly charmed J(P) = 0(-) diquark-antidiquark states T-cc (s) over bar(s) over bar(++) and T-cc;(d) over bar<(s)over (++)(bar>) that bear two units of the electric charge are calculated by means of QCD two-point sum rule method. Computations are carried out by taking into account vacuum condensates up to and including terms of tenth dimension. The dominant S-wave decays of these tetraquarks to a pair of conventional D-s(+) D-s0*(+)(2317) and D+ D-s0*(+)(2317) mesons are explored using QCD three-point sum rule approach, and their widths are found. The obtained results m(T) = (4390 +/- 150) MeV and Gamma = (302 +/- 113 MeV) for the mass and width of the state T-cc (s) over bar(s) over bar(++), as well as spectroscopic parameters (m) over tilde (T) (4265 +/- 140) MeV and (Gamma) over tilde = (171 +/- 52) MeV of cc; ss the tetraquark T-cc;(d) over bar<(s)over (++)(bar>) may be useful in experimental studies of exotic resonances. (C) 2018 The Authors. Published by Elsevier B.V.