Doubly charmed strange tetraquark

The LHCb experiment at CERN has discovered a doubly charmed isoscalar tetraquark T-cc with the quantum numbers of cc (u) over bar (d) over bar and mass of about 3875 MeV/c(2), decaying to (DD0)-D-0 pi(+) through the intermediate channel D*D-+(0). We present a study of its strange companions with the quantum numbers of cc (q) over bar (s) over bar, where q = u, d and isospin violation is neglected.