TY  - JOUR
AU  - Pich, A.
AU  - Rosell, I.
AU  - Sanz-Cillero, J. J.
PY  - 2013
DA  - 2013//
TI  - Viability of Strongly Coupled Scenarios with a Light Higgs-like Boson
T2  - Phys. Rev. Lett.
JO  - Physical Review Letters
SP  - 181801
EP  - 4pp
VL  - 110
IS  - 18
PB  - Amer Physical Soc
AB  - We present a one-loop calculation of the oblique S and T parameters within strongly coupled models of electroweak symmetry breaking with a light Higgs-like boson. We use a general effective Lagrangian, implementing the chiral symmetry breaking SU(2)(L) circle times SU(2)(R) -> SU(2)(L+R) with Goldstone bosons, gauge bosons, the Higgs-like scalar, and one multiplet of vector and axial-vector massive resonance states. Using a dispersive representation and imposing a proper ultraviolet behavior, we obtain S and T at the next-to-leading order in terms of a few resonance parameters. The experimentally allowed range forces the vector and axial-vector states to be heavy, with masses above the TeV scale, and suggests that the Higgs-like scalar should have a WW coupling close to the standard model one. Our conclusions are generic and apply to more specific scenarios such as the minimal SO(5)/SO(4) composite Higgs model.
SN  - 0031-9007
UR  - http://arxiv.org/abs/1212.6769
UR  - https://doi.org/10.1103/PhysRevLett.110.181801
DO  - 10.1103/PhysRevLett.110.181801
LA  - English
N1  - WOS:000319020100002
ID  - Pich_etal2013
ER  -