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We use the same methods to predict a doubly-bottom tetraquark $T(bb\\bar u\\bar d)$ with $J^P{=}1^+$ at $10,389\\pm 12$ MeV, 215 MeV below the $B^-\\bar B^{*0}$ threshold and 170 MeV below threshold for decay to $B^-\\bar B^0 \\gamma$. The $T(bb\\bar u\\bar d)$ is therefore stable under strong and electromagnetic (EM) interactions and can only decay weakly, the first exotic hadron with such a property. 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Rosner, Marek Karliner","submitted_at":"2017-07-24T17:57:07Z","abstract_excerpt":"Recently LHCb discovered the first doubly-charmed baryon $\\Xi_{cc}^{++} = ccu$ at $3621.40 \\pm 0.78$ MeV, very close to our theoretical prediction. We use the same methods to predict a doubly-bottom tetraquark $T(bb\\bar u\\bar d)$ with $J^P{=}1^+$ at $10,389\\pm 12$ MeV, 215 MeV below the $B^-\\bar B^{*0}$ threshold and 170 MeV below threshold for decay to $B^-\\bar B^0 \\gamma$. The $T(bb\\bar u\\bar d)$ is therefore stable under strong and electromagnetic (EM) interactions and can only decay weakly, the first exotic hadron with such a property. 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