Composite Resonances effects on EWPT and Higgs diphoton decay rate

Abstract

In scenarios of strongly coupled electroweak symmetry breaking, heavy composite particles of different spin and parity may arise and cause observable effects on signals that appear at loop levels. The recently observed process of Higgs to $\gamma \gamma$ at the LHC is one of such signals. We study the new constraints that are imposed on composite models from $H\to \gamma \gamma$, together with the existing constraints from the high precision electroweak tests. We use an effective chiral Lagrangian to describe the effective theory that contains the Standard Model spectrum and the extra composites below the electroweak scale. Considering the effective theory cutoff at $\Lambda =4\pi v\sim 3$ TeV, consistency with the $T$ and $S$ parameters and the newly observed $H\to \gamma \gamma$ can be found for a rather restricted range of masses of vector and axial-vector composites from $1.5$ TeV to $1.7$ TeV and $1.8$ TeV to $1.9$ TeV, respectively, and only provided a non-standard kinetic mixing between the $W^3$ and $B^0$ fields is included.

8 pages, 12 figures. Presented by Antonio Cárcamo at the X SILAFAE, Medellin, Colombia, November 24-28, 2014. To be published in Nuclear and Particle Physics Proceedings. Contribution to the proceedings of the X SILAFAE 2014. Typos fixed

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Cited by in corpus (3)

• Modelling top partner-vector resonance phenomenology
• Scalar resonance in a top partner model
• Higgs boson coupling to a new strongly interacting sector