An auxiliary-field effective theory yields a lineshape parametrization for molecular X(3872) that consistently describes deuteron scattering data and differs from the Flatté form used for compact interpretations.
Tetraquarks at large M and large N
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The 0+ T_bc tetraquark is predicted near the B D-bar threshold while the 1+ state appears as an S-wave resonance 23-28 MeV above the B* D-bar threshold, with masses 7.143-7.222 GeV.
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A New Look at the X Compositeness from its Lineshape
An auxiliary-field effective theory yields a lineshape parametrization for molecular X(3872) that consistently describes deuteron scattering data and differs from the Flatté form used for compact interpretations.
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The $T_{bc}$ tetraquarks near the $B\bar{D}$ threshold
The 0+ T_bc tetraquark is predicted near the B D-bar threshold while the 1+ state appears as an S-wave resonance 23-28 MeV above the B* D-bar threshold, with masses 7.143-7.222 GeV.