Inverse scattering problem with a bare state

Abstract

In hadron physics, molecular-like multihadron states can interact with compact multiquark states. The latter are modeled as bare states in the Hilbert space of a potential model. In this work, we study several potential models relevant to the bare state, and solve their inverse scattering problems. The first model, called "cc", is a separable potential model. We show that it can approximate (single-channel short-range) $S$-wave near-threshold physics with an error of $\mathcal{O}({\beta }^3/M_V^3)$, where $\beta$ sets the maximum momentum of the near-threshold region and $M_V$ is the typical scale of the potential. The second model, called "bc", serves as the bare-state-dominance approximation, where interaction between continuum states is ignored. Under this model, even though the bare state is always crucial for a bound state's generation, a shallow bound state naturally tends to have a small bare-state proportion. Therefore, we need other quantities to quantify the importance of the bare state. The last model, called "bcc", is a combination of the first two models. This model not only serves as a correction to the bare-state-dominance approximation, but can also be used to understand the interplay between quark and hadron degrees of freedom. This model naturally leads to the presence of a Castillejo-Dalitz-Dyson (CDD) zero. We consider the energy decomposition of a bound state. The potential ratio of the bare-continuum interaction to the continuum self-interaction is proposed to understand how the bound state is generated. Model independently, an inequality for the potential ratio is derived. Based on the model "bcc", the CDD zero can be used to estimate the potential ratio. Finally, we apply these studies to the deuteron, $\rho$ meson, and $D_{s0}^{\ast }(2317)$, and analyze their properties.

28 pages 2 figures

References in corpus (15)

• Nuclear Force from Lattice QCD
• Lattice QCD Evidence that the Lambda(1405) Resonance is an Antikaon-Nucleon Molecule
• Comprehensive analysis of the wave function of a hadronic resonance and its compositeness
• Masses and decay constants of the $D_{s0}^{\ast }(2317)$ and $D_{s1}(2460)$ from $N_f=2$ lattice QCD close to the physical point
• Interplay of quark and meson degrees of freedom in a near-threshold resonance
• Remarks on pole trajectories for resonances
• Structure of the $\mathbf{\Lambda }(1405)$ from Hamiltonian effective field theory
• Hamiltonian effective field theory study of the ${\mathbf{N}}^{\ast }(1440)$ resonance in lattice QCD
• How much is the compositeness of a bound state constrained by $a$ and $r_0$? The role of the interaction range
• Generalized weak-binding relations of compositeness in effective field theory
• Two-body wave functions and compositeness from scattering amplitudes. I. General properties with schematic models
• Virtual states and generalized completeness relation in the Friedrichs Model
• Deuteron: properties and analytical forms of wave function in coordinate space
• Spatial interpretation of "compositeness" for finite-range potentials
• A toy model for "elementariness"

Cited by in corpus (2)

• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• The investigations of the $P$-wave $B_s$ states combining quark model and lattice QCD in the coupled channel framework