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Unstable Particles
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abstract
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 $Z^0$ resonance physics, $W^+W^-$ and $Z^0Z^0$ pair production and can be straightforwardly applied to other processes.
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Cited by 1 Pith paper
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Precise Standard-Model predictions for polarised Z-boson pair production and decay at the LHC
The authors deliver the first NNLO QCD plus NLO EW combination of predictions for polarised ZZ pairs at the LHC and validate them across five Monte Carlo codes and against ATLAS simulations.
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