TY  - JOUR
AU  - Pich, A.
AU  - Rosell, I.
AU  - Sanz-Cillero, J. J.
PY  - 2014
DA  - 2014//
TI  - Oblique S and T constraints on electroweak strongly-coupled models with a light Higgs
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 157
EP  - 35pp
VL  - 01
IS  - 1
PB  - Springer
KW  - Higgs Physics
KW  - Beyond Standard Model
KW  - Chiral Lagrangians
KW  - Technicolor and Composite Models
AB  - Using a general effective Lagrangian implementing the chiral symmetry breaking SU(2)(L) circle times SU(2)(R) -> SU(2)(L+R), we present a one-loop calculation of the oblique S and T parameters within electroweak strongly-coupled models with a light scalar. Imposing a proper ultraviolet behaviour, we determine S and T at next-to-leading order in terms of a few resonance parameters. The constraints from the global fit to electroweak precision data force the massive vector and axial-vector states to be heavy, with masses above the TeV scale, and suggest that the W+W- and and ZZ couplings of the Higgs-like scalar should be close to the Standard Model value. Our findings are generic, since they only rely on soft requirements on the short-distance properties of the underlying strongly-coupled theory, which are widely satisfied in more specific scenarios.
SN  - 1029-8479
UR  - http://arxiv.org/abs/1310.3121
UR  - https://doi.org/10.1007/JHEP01(2014)157
DO  - 10.1007/JHEP01(2014)157
LA  - English
N1  - WOS:000346240600006
ID  - Pich_etal2014
ER  -