Graviton resonance phenomenology and a pNGB Higgs at the LHC

Abstract

We present an effective description of a spin two massive state and a pseudo Nambu-Goldstone boson Higgs in a two site model. Using this framework we model the spin two state as a massive graviton and we study its phenomenology at the LHC. We find that a reduced set of parameters can describe the most important features of this scenario. We address the question of which channel is the most sensitive to detect this graviton. Instead of designing search strategies to estimate the significance in each channel, we compare the ratio of our theoretical predictions to the limits set by available experimental searches for all the decay channels and as a function of the free parameters in the model. We discuss the phenomenological details contained in the outcome of this simple procedure. The results indicate that, for the studied masses between 0.5 and 3 TeV, the channels to look for such a graviton resonance are mainly $ZZ$, $WW$ and $\gamma \gamma$. This is the case even though top and bottom quarks dominate the branching ratios, since their experimental sensitivity is not as good as the one of the electro-weak gauge bosons. We find that as the graviton mass increases, the $ZZ$ and $WW$ channels become more important because of its relatively better enhancement over background, mainly due to fat jet techniques. We determine the region of the parameter space that has already been excluded and the reach for the LHC next stages. We also estimate the size of the loop-induced contributions to the production and decay of the graviton, and show in which region of the parameter space their effects are relevant for our analysis.

This article is inspired by our recent submission 1606.05326 on the 750 GeV diphoton resonance. We have kept the intrinsic results (theory of a graviton and a pNGB Higgs) which are relevant independently of the existence of the specific resonance, and we have added a whole new phenomenological analysis for a massive spin 2 particle at the LHC

References in corpus (10)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• A custodial symmetry for Zbb
• Light custodians in natural composite Higgs models
• The Flavor of the Composite Pseudo-Goldstone Higgs
• Search for new phenomena in the dijet mass distribution using $p-p$ collision data at $\sqrt{s}=8$ TeV with the ATLAS detector
• Warped Gravitons at the LHC and Beyond
• Light Kaluza-Klein States in Randall-Sundrum Models with Custodial SU(2)
• Minimal Composite Higgs Models at the LHC
• Search for RS gravitons via $W_L{W}_L$ decays
• Update of the electroweak precision fit, interplay with Higgs-boson signal strengths and model-independent constraints on new physics

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