Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1992-09-29
Nucl.Phys. B409 (1993) 257-289
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX (style article), 26 pages, 7 figures (available upon request), UGVA-DPT 1992/07-778
Scientific paper
10.1016/0550-3213(93)90580-I
We present an effective Lagrangian parameterization describing scalar, vector, and axial-vector bound states, originating from a strong breaking of the electroweak symmetry, based on the global symmetry $SU(N)_L\otimes SU(N)_R$. In this approach vector and axial-vector bound states are gauge bosons associated to a hidden $SU(N)_L\otimes SU(N)_R$ symmetry. After the gauging of the electroweak symmetry, the corrections to the self-energies of the standard model gauge bosons are calculated and bounds on the parameter space of the model arising from precision measurements are studied. The self-energy corrections arise from spin 1 mixings, pseudogoldstones loops, pseudogoldstone-spin 1 loops, and tadpole terms. The one-loop terms tend to decrease both isospin conserving and isospin violating corrections. Careful calculation for standard $SU(8)$ QCD-scaled technicolor shows that strictly this model (which has however serious theoretical difficulties on his own) is still marginally allowed at present experimental precision.
Bartolomeo Nicola Di
Casalbuoni Roberto
Curtis Stefania de
Deandrea Aldo
Dominici Daniele
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