Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-01-07
Eur.Phys.J.C34:447-475,2004
Physics
High Energy Physics
High Energy Physics - Phenomenology
Some precisions added to section 3.4. Reference [13] added. To appear in EPJC
Scientific paper
10.1140/epjc/s2004-01731-7
Inspired by recent developments of moose models we reconsider low-energy effective theories of Goldstone bosons, gauge fields and chiral fermions applied to low-energy QCD and to Higgs-less electroweak symmetry breaking. Couplings and the corresponding reduction of symmetry are introduced via constraints enforced by a set of non-propagating covariantly constant spurion fields. Relics of the latter are used as small expansion parameters conjointly with the usual low-energy expansion. Certain couplings can only appear at higher orders of the spurion expansion and consequently, they become naturally suppressed independently of the idea of dimensional deconstruction. At leading order this leads to a set of generalized Weinberg sum rules and to the suppression of non-standard couplings to fermions in Higgs-less EWSB models with the minimal particle content. Within the latter, higher spurion terms allow for a fermion mass matrix with the standard CKM structure and CP violation. In addition, Majorana masses for neutrinos are possible. Examples of non-minimal models are briefly mentioned.
Hirn Johannes
Stern Jan
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