Journal
MODERN PHYSICS LETTERS A
Volume 30, Issue 29, Pages -Publisher
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S0217732315501357
Keywords
Frohlich-Morchio-Strocchi mechanism; Brout-Englert-Higgs effect; gauge invariance; bound states; beyond-the-Standard-Model physics; 2-Higgs-doublet model; grand-unified theories; technicolor
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One of the major problems in developing new physics scenarios is that very often the parameters can be adjusted such that in perturbation theory almost all experimental low-energy results can be accommodated. It is therefore desirable to have additional constraints. Field-theoretical considerations can provide such additional constraints on the low-lying spectrum and multiplicities of models. Especially for theories with elementary or composite Higgs particle the Frohlich-Morchio-Strocchi (FMS) mechanism provides a route to create additional conditions, though showing it to be at work requires genuine non-perturbative calculations. The qualitative features of this procedure are discussed for generic 2-Higgs-doublet models (2HDMs), grand-unified theories (GUTs) and technicolor-type theories.
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