Mass and decay constant of the newly observed exotic $X(5568)$ state

Abstract

The mass and decay constant of the $X(5568)$ state newly observed by D0 Collaboration are computed within the two-point sum rule method using the diquark-antidiquark interpolating current. In calculations, the vacuum condensates up to eight dimensions are taken into account. The obtained result for the mass of the $X(5568)$ state is in a nice agreement with the experimental data.Comment: 5 Pages, 2 Figures and 1 Table; To be published in Phys. Rev. D. arXiv admin note: text overlap with arXiv:1601.0384