AdS/QCD approach to the scale-invariant extension of the standard model with a strongly interacting hidden sector

TL;DR

This paper explores a scale-invariant extension of the standard model with a strongly interacting hidden sector using AdS/QCD, reducing parameters and analyzing dark matter candidates called hidden pions.

Contribution

It introduces a predictive AdS/QCD-based model with only three key parameters for the hidden sector, linking it to dark matter phenomenology.

Findings

Both resonance and non-resonance solutions are viable.

Correlations between relic density, Higgs signals, and DM-nucleon cross section are identified.

Benchmark points are provided for experimental validation.

Abstract

In this paper, we revisit a scale-invariant extension of the standard model (SM) with a strongly interacting hidden sector within AdS/QCD approach. Using the AdS/QCD, we reduce the number of input parameters to three, {\it i.e.} hidden pion decay constant, hidden pion mass and $\tan\beta$ that is defined as the ratio of the vacuum expectation values (VEV) of the singlet scalar field and the SM Higgs boson. As a result, our model has sharp predictability. We perform the phenomenological analysis of the hidden pions which is one of the dark matter (DM) candidates in this model. With various theoretical and experimental constraints we search for the allowed parameter space and find that both resonance and non-resonance solutions are possible. Some typical correlations among various observables such as thermal relic density of hidden pions, Higgs boson signal strengths and DM-nucleon cross section are investigated. We provide some benchmark points for experimental tests.