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Structure of open-flavour four-quark states in the charm and bottom region
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abstract
We present quantitative results for masses and the internal structure of four-quark states with two heavy quarks, i.e. $QQ'\bar{q}\bar{q}'$ with $Q,Q'\in \{c,b\}$ and $q,q' \in \{u,d,s\}$, and $J^{P} \in {1^+}$. The composition of these states in terms of meson-meson and diquark-antidiquark pairs, extracted from a relativistic four-body Faddeev-Yakubowski equation, is dynamically determined from underlying QCD forces. We find states at energy levels in very good agreement with lattice QCD and, where available, with experimental states. Their internal structure, most notably between the $T^+_{cc}$, $T_{bc}$ and $T^-_{bb}$, show significant and sizeable variations.
Forward citations
Cited by 2 Pith papers
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Screening masses of positive- and negative-parity hadron ground-states, including those with strangeness
Screening masses of flavour-SU(3) meson and baryon parity partners are computed in a contact-interaction model, showing parity degeneracy above T_c and survival of only J=0 diquarks in 1/2± baryons at high T.
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Prediction of an $I(J^{P})=0(1^{-})$ $\bar{b}\bar{b}ud$ Tetraquark Resonance Close to the $B^\ast B^\ast$ Threshold Using Lattice QCD Potentials
A coupled-channel Born-Oppenheimer calculation with lattice QCD potentials predicts a broad \bar{b}\bar{b}ud tetraquark resonance about 4 MeV above the B*B* threshold, with mass 2m_B + 94 MeV and width 140 MeV.
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