2024-03-29T13:29:33Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/965742016-02-18T03:07:45Zcom_10261_61com_10261_4col_10261_314
Oblique S and T constraints on electroweak strongly-coupled models with a light Higgs
Pich, Antonio
Rosell, Ignasi
Sanz-Cillero, Juan José
SCOAP
Higgs Physics
Beyond Standard Model
Chiral lagrangians
Technicolor and Composite Models
Using a general effective Lagrangian implementing the chiral symmetry breaking SU(2) L ⊗ 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 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.
This work has been supported in part by the Spanish Government and ERDF funds from the European Commission [grants FPA2010-17747, FPA2011-23778, AIC-D-2011-0818, SEV-2012-0249 (Severo Ochoa Program), CSD2007-00042 (Consolider Project CPAN)], the Generalitat Valenciana [PrometeoII/2013/007] and the Comunidad de Madrid [HEPHACOS S2009/ESP-1473].
Peer reviewed
2014-05-13T09:46:41Z
2014-05-13T09:46:41Z
2014-01-28
artículo
http://purl.org/coar/resource_type/c_6501
Journal of High Energy Physics 2014: 157 (2014)
http://hdl.handle.net/10261/96574
10.1007/JHEP01(2014)157
1029-8479
en
Publisher's version
http://dx.doi.org/10.1007/JHEP01(2014)157
open
Springer