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We get $m_{B_s0}=(6.04\\pm 0.08) \\GeV$, which is bigger than predictions supposing it as a $b\\bar{s}$ state or a $B\\bar{K}$ bound state with $J^{P}=0^+$. To evaluate the $g_{B_{s0}B K}$ coupling we use the three point correlation functions of the vertex, considering $ B_{s0} $ as a normal $b\\bar{s}$ state. The obtained coupling constant is: $g_{B_{s0} B K} =(16.3 \\pm 3.2) \\GeV$. 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Bracco, M. Nielsen","submitted_at":"2010-02-26T13:51:44Z","abstract_excerpt":"We evaluate the mass of the $B_{s0}$ scalar meson and the coupling constant in the $B_{s0} B K$ vertex in the framework of QCD sum rules. We consider the $B_{s0}$ as a tetraquark state to evaluate its mass. We get $m_{B_s0}=(6.04\\pm 0.08) \\GeV$, which is bigger than predictions supposing it as a $b\\bar{s}$ state or a $B\\bar{K}$ bound state with $J^{P}=0^+$. To evaluate the $g_{B_{s0}B K}$ coupling we use the three point correlation functions of the vertex, considering $ B_{s0} $ as a normal $b\\bar{s}$ state. The obtained coupling constant is: $g_{B_{s0} B K} =(16.3 \\pm 3.2) \\GeV$. 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