Perturbation Theory with Unstable Fundamental Fields

@inproceedings{Tkachov1998PerturbationTW,
  title={Perturbation Theory with Unstable Fundamental Fields},
  author={Fyodor V. Tkachov},
  year={1998}
}
The difficulties of perturbation theory associated with un stable fundamental fields (such as the lack of exact gauge invariance in each order) are cured if one constructs perturbative e xpansion d irectly for probabilities interpreted as distributions in k inematic variables. Such an expansion is made possible by the powerful method of non-Euclidean asymptotic operation [ 1]. U nstable particles (Z, W, top qu ark, higgs boson, etc.) are at t he focus of current high energy physics research… CONTINUE READING

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