Resonance (particle physics)

In particle physics, a resonance is the peak located around a certain energy found in differential cross sections of scattering experiments. These peaks are associated with subatomic particles, which include a variety of bosons, quarks and hadrons (such as nucleons, delta baryons or upsilon mesons) and their excitations. In common usage, 'resonance' only describes particles with very short lifetimes, mostly high-energy hadrons existing for 10−23 seconds or less. In particle physics, a resonance is the peak located around a certain energy found in differential cross sections of scattering experiments. These peaks are associated with subatomic particles, which include a variety of bosons, quarks and hadrons (such as nucleons, delta baryons or upsilon mesons) and their excitations. In common usage, 'resonance' only describes particles with very short lifetimes, mostly high-energy hadrons existing for 10−23 seconds or less. The width of the resonance (Γ) is related to the mean lifetime (τ) of the particle (or its excited state) by the relation where h is the Planck constant and ℏ = h 2 π {displaystyle {hbar }={frac {h}{2pi }}} . Thus, the lifetime of a particle is the direct inverse of the particle's resonance width. For example, the charged pion has the second-longest lifetime of any meson, at 2.6033×10−8 s. Therefore, its resonance width is very small, about 2.528×10−8 eV or about 6.11 MHz. Pions are generally not considered as 'resonances'. The charged rho meson has a very short lifetime, about 4.41×10−24 s. Correspondingly, its resonance width is very large, at 149.1 MeV or about 36 ZHz. This amounts to nearly one-fifth of the particle's rest mass.