Lattice QCD on one ensemble yields electromagnetic form factors for T_bb, indicating a compact heavy diquark plus light antidiquark bound state with charge radius smaller than the BB* threshold.
Haberzettl, Model-independent form-factor con- straints for electromagnetic spin-1 currents, Phys
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Using a vector meson dominance model fitted to BaBar data, the e+e- to K+K- pi0 pi0 cross section yields a central value of 4.5 and upper bound of 6.3 for the K* magnetic dipole moment in units of e/2m_K*.
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Electromagnetic form factors and structure of the $T_{bb}$ tetraquark from lattice QCD
Lattice QCD on one ensemble yields electromagnetic form factors for T_bb, indicating a compact heavy diquark plus light antidiquark bound state with charge radius smaller than the BB* threshold.
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Effect of $K^*$ meson magnetic dipole moment on the $e^+e^- \to K^+ K^-\pi^0 \pi^0 $ cross section
Using a vector meson dominance model fitted to BaBar data, the e+e- to K+K- pi0 pi0 cross section yields a central value of 4.5 and upper bound of 6.3 for the K* magnetic dipole moment in units of e/2m_K*.