A bound state model for a light scalar

Understand

Recent lattice studies of near-conformal strong dynamics suggest the existence of a light scalar.

• This provides motivation to consider a simple Hamiltonian-based bound-state model where the pseudoscalar, scalar, vector and axial-vector states are treated on an equal footing.
• The model interpolates between the non-relativistic limit and the highly relativistic chiral limit, where the pseudoscalar mass drops to zero.
• The fermion mass becomes purely dynamical at this point.