$\bar{b}\bar{b}ud$ Tetraquarks with $I(J^P)=0(1^-)$ and $\bar{b}\bar{c}ud$ Tetraquarks with $I(J^P)=0(0^+)$ and $I(J^P)=0(1^+)$ from Lattice QCD Antistatic-Antistatic Potentials

We study heavy spin effects in $\overset{ˉ}{b} \overset{ˉ}{b} u d$ and $\overset{ˉ}{b} \overset{ˉ}{c} u d$ four-quark systems using the Born-Oppenheimer approximation and existing antistatic-antistatic potentials computed with lattice QCD. We report about a recent refined investigation of the $\overset{ˉ}{b} \overset{ˉ}{b} u d$ system with $I (J^{P}) = 0 (1^{-})$ , where we predicted a tetraquark resonance slightly above the $B^{*} B^{*}$ threshold. Furthermore, we extend our Born-Oppenheimer approach to $\overset{ˉ}{b} \overset{ˉ}{c} u d$ four-quark systems. For quantum numbers $I (J^{P}) = 0 (0^{+})$ as well as $I (J^{P}) = 0 (1^{+})$ we find virtual bound states rather far away from the lowest meson-meson thresholds.

$\overset{ˉ}{b} \overset{ˉ}{b} u d$ Tetraquarks with $I (J^{P}) = 0 (1^{-})$ and $\overset{ˉ}{b} \overset{ˉ}{c} u d$ Tetraquarks with $I (J^{P}) = 0 (0^{+})$ and $I (J^{P}) = 0 (1^{+})$ from Lattice QCD Antistatic-Antistatic Potentials

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$\overset{ˉ}{b} \overset{ˉ}{b} u d$ Tetraquarks with $I (J^{P}) = 0 (1^{-})$ and $\overset{ˉ}{b} \overset{ˉ}{c} u d$ Tetraquarks with $I (J^{P}) = 0 (0^{+})$ and $I (J^{P}) = 0 (1^{+})$ from Lattice QCD Antistatic-Antistatic Potentials

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bˉbˉudbˉbˉud Tetraquarks with I(JP)=0(1−)I(JP)=0(1−) and bˉcˉudbˉcˉud Tetraquarks with I(JP)=0(0+)I(JP)=0(0+) and I(JP)=0(1+)I(JP)=0(1+) from Lattice QCD Antistatic-Antistatic Potentials

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bˉbˉudbˉbˉud Tetraquarks with I(JP)=0(1−)I(JP)=0(1−) and bˉcˉudbˉcˉud Tetraquarks with I(JP)=0(0+)I(JP)=0(0+) and I(JP)=0(1+)I(JP)=0(1+) from Lattice QCD Antistatic-Antistatic Potentials

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$\overset{ˉ}{b} \overset{ˉ}{b} u d$ Tetraquarks with $I (J^{P}) = 0 (1^{-})$ and $\overset{ˉ}{b} \overset{ˉ}{c} u d$ Tetraquarks with $I (J^{P}) = 0 (0^{+})$ and $I (J^{P}) = 0 (1^{+})$ from Lattice QCD Antistatic-Antistatic Potentials

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$\overset{ˉ}{b} \overset{ˉ}{b} u d$ Tetraquarks with $I (J^{P}) = 0 (1^{-})$ and $\overset{ˉ}{b} \overset{ˉ}{c} u d$ Tetraquarks with $I (J^{P}) = 0 (0^{+})$ and $I (J^{P}) = 0 (1^{+})$ from Lattice QCD Antistatic-Antistatic Potentials

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