Holographic techni-dilaton at 125 GeV

TL;DR

This paper explores a holographic walking technicolor model where the techni-dilaton can naturally be light at 125 GeV, with its decay constant determined independently of model parameters, aligning with LHC observations.

Contribution

It demonstrates that in a holographic walking technicolor model, the techni-dilaton can be naturally light and its decay constant is uniquely determined, providing a viable candidate for the 125 GeV boson.

Findings

The techni-dilaton becomes massless at the conformal limit.

The decay constant F_phi is proportional to sqrt{2 N_TF} times F_pi.

The holographic model is consistent with the observed 125 GeV boson at LHC.

Abstract

We find that a holographic walking technicolor model has a limit ("conformal limit") where the techni-dilaton (TD) becomes an exactly massless Nambu-Goldstone boson of the scale symmetry with its nonzero finite decay constant F_phi /= 0, which naturally realizes a light TD, say at 125 GeV, near the limit. In such a light TD case, we find that F_phi is uniquely determined by the techni-pion decay constant F_pi independently of the holographic parameters: F_phi/F_pi ~= sqrt{2 N_TF}, with N_TF being the number of techni-fermions. We show that the holographic TD is consistent with a new boson at 125 GeV recently discovered at the LHC.