Unstable Particles
Stuart, Robin G.
الأصل · EN
Unstable particles cannot be treated as asymptotic external states in S-matrix theory and when they occur as resonant states cannot be described by finite-order perturbation theory. The known facts concerning unstable particles are reviewed and it is shown how to construct gauge-invariant expressions for matrix elements containing intermediate unstable particles and physically meaningful production cross-sections for unstable particles. The results and methodology presented are relevant for Z⁰ resonance physics, W+W- and Z⁰Z⁰ pair production and can be straightforwardly applied to other processes.
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