The compositeness of near-threshold eigenstates with Coulomb plus short-range forces is determined solely by the Coulomb scattering length, effective range, and Bohr radius, with the Coulomb interaction qualitatively altering threshold behavior and internal structure compared to short-range cases.
Effective range expansion for narrow near-threshold resonances
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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.
Adding Pomeron exchange to the NΩ system improves agreement with experiment in the ^5S2 channel and predicts a weak quasi-bound state in the ^3S1 channel.
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Compositeness of near-threshold eigenstates with Coulomb plus short-range interactions
The compositeness of near-threshold eigenstates with Coulomb plus short-range forces is determined solely by the Coulomb scattering length, effective range, and Bohr radius, with the Coulomb interaction qualitatively altering threshold behavior and internal structure compared to short-range cases.
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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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Near-threshold scattering of proton and Omega baryon and possible bound states
Adding Pomeron exchange to the NΩ system improves agreement with experiment in the ^5S2 channel and predicts a weak quasi-bound state in the ^3S1 channel.