A Higgs or not a Higgs? What to do if you discover a new scalar particle

C. P. Burgess, J. Matias, M. Pospelov

Research output: Contribution to journalReview articlepeer-review

44 Scopus citations


We show how to systematically analyze what may be inferred should a new scalar particle be discovered in collider experiments. Our approach is systematic in the sense that we perform the analysis in a manner which minimizes a priori theoretical assumptions as to the nature of the scalar particle. For instance, we do not immediately make the common assumption that a new scalar particle is a Higgs boson, and so must interact with a strength proportional to the mass of the particles with which it couples. We show how to compare different observables, and so to develop a decision tree from which the nature of the new particle may be discerned. We define several categories of models, which summarize the kinds of distinctions which the first experiments can make.

Original languageEnglish (US)
Pages (from-to)1841-1918
Number of pages78
JournalInternational Journal of Modern Physics A
Issue number14
StatePublished - Jun 10 2002

Bibliographical note

Funding Information:
We thank G. Azuelos and F. Corriveau for helpful conversations. This research was partially funded by N.S.E.R.C. of Canada, les Fonds F.C.A.R. du Quebec, and was supported in part by the Department of Energy under Grant No. DE-FG02-94ER40823. C. P. Burgess thanks the University of Barcelona for its generous support, and congenial hospitality, while part of this research was being carried out. J. Matias acknowledges nancial support from a Marie Curie EC grant (TMR-ERBFMBICT 972147) and thanks the Physics Department of McGill University for the kind hospitality and nice atmosphere when completing this work.


  • Effective theories
  • Non-standard Higgs
  • Scalar

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