We study lifetimes of heavy mesons in the 't Hooft model, a large-Nc theory strong interaction two-dimensional spacetime. Since this model is solvable, one can evaluate total decay widths through hadronic amplitudes that are determined unambiguously within formalism. investigate quark-hadron duality by numerically comparing exclusive result and from quark expansion, with contribution Pauli inte...

In this paper, we investigate the stability of equilibrium in stage-structured and density-dependent predator–prey system with Beddington–DeAngelis functional response. First, by checking sign real part for eigenvalue, local origin boundary are studied. Second, explore positive τ=0 τ≠0 (time delay τ is time taken from immaturity to maturity predator), which shows that dependent on parameter τ. ...