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In present work, we systematically calculate the mass spectra of open charmand bottom tetraquarks $q q\bar q \bar Q$ within an extended relativized quarkmodel. The four-body relativized Hamiltonians including the Coulomb potential,confining potential, spin-spin interactions, and relativistic corrections aresolved by using the variational method. It is found that the predicted massesof four $0^+$ $ud\bar s \bar c$ states are 2765, 3065, 3152, and 3396 MeV,which disfavor the assignment of the newly observed $X_0(2900)$ as a compacttetraquark. Moreover, the whole mass spectra of the open charm and bottomtetraquarks show quite similar patterns, which preserve the light flavor SU(3)symmetry and heavy quark symmetry well. In addition, our results suggest thatthe flavor exotic states $nn\bar s \bar c$, $nn\bar s \bar b$, $ss\bar n \barc$, and $ss\bar n \bar b$ and their antiparticles can be searched in theheavy-light meson plus kaon final states by future experiments. Moretheoretical and experimental efforts are needed to investigate these singlyheavy tetraquarks.

Open charm and bottom tetraquarks in an extended relativized quark model