What are the line-shape parameters in resonance?
In particle physics, a resonance is the peak located around a certain energy found in cross sections of scattering experiments. These peaks are usually associated with subatomic particle (elementary or not) and their excitations. The peak energy of the resonance corresponds to the mass m of the particle. The width of the resonance (Γ), also called the particle decay width, is related to the lifetime (τ) of the particle by the relation