Abstract
We show that the 750 GeV di-photon excess can be interpreted as a spin-2 resonance arising from a strongly interacting dark sector featuring some departure from conformality. This spin-2 resonance has negligible couplings to the SM particles, with the exception of the SM gauge bosons which mediate between the two sectors. We have explicitly studied the collider constraints as well as some theoretical bounds in a holographic five dimensional model with a warp factor that deviates from AdS$_5$. In particular, we have shown that it is not possible to decouple the vector resonances arising from the strong sector while explaining the di-photon anomaly and keeping the five dimensional gravity theory under perturbative control. However, vector resonances with masses around the TeV scale can be present while all experimental constraints are met.
Highlights
The discovery of the Higgs boson by the ATLAS and CMS Collaborations at the Large Hadron Collider (LHC) marked the beginning of a new era in high energy physics
This means that we could be closer than ever to understand some extremely important unsolved puzzles in particle physics, like the large hierarchy between the electroweak and the Planck scales, the origin of fermion masses or even what lies behind Dark Matter (DM)
We have shown that the 750 GeV resonance, if experimentally confirmed, can be the KK graviton of an approximately conformal dark sector, which accounts for the bulk of the observed DM relic abundance
Summary
The discovery of the Higgs boson by the ATLAS and CMS Collaborations at the Large Hadron Collider (LHC) marked the beginning of a new era in high energy physics. The finding of the long-sought particle offers us the unique opportunity to start testing the origin of electroweak symmetry breaking (EWSB) This means that we could be closer than ever to understand some extremely important unsolved puzzles in particle physics, like the large hierarchy between the electroweak and the Planck scales, the origin of fermion masses or even what lies behind Dark Matter (DM). We will show that in models where the strong sector features some deformation of conformality, parametrized in the five dimensional (5D) framework by a modified background, a light graviton can naturally explain the observed anomaly while still fulfilling all other experimental constraints arising from collider searches or EWPT. The article is organized as follows: in Section 2 we introduce the original theoretical motivation and the concrete 5D framework where all computations will be performed.
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