QCD sum rule study of a charged bottom-strange scalar meson

Using the QCD sum rule approach, we investigate the possible four-quark structure for the new observed Bₛ⁰π^± narrow structure (D0). We use a diquak-antidiquark scalar current and work to the order of mₛ in full QCD, without relying on 1/mQ expansion. Our study indicates that although it is possible to obtain a stable mass in agreement with the state found by the D0 collaboration, more constraint analysis (simultaneous requirement of the OPE convergence and the dominance of the pole on the phenomenological side) leads to a higher mass. We also predict the masses of the bottom scalar tetraquark resonances with zero and two strange quarks.