Constraining minimal and non-minimal UED models with Higgs couplings

TL;DR

This paper investigates how Higgs boson coupling measurements constrain extra-dimensional models, showing minimal models are disfavored below 1.3 TeV, but generalized models with brane terms can allow scales as low as 0.4 TeV.

Contribution

It provides the first detailed analysis of Higgs coupling constraints on minimal and non-minimal UED models with brane localized kinetic terms.

Findings

Minimal UED models are disfavored below 1.3 TeV.

Including brane localized kinetic terms relaxes constraints to 0.4 TeV.

Higgs coupling measurements significantly constrain extra-dimensional theories.

Abstract

Early indications from the LHC for the observed scalar boson imply properties close to the Standard Model Higgs, putting considerable constraints on TeV scale new physics scenarios. In this letter we consider flat extra dimensional scenarios with the fifth spatial dimension compactified on an S^1/Z_2 orbifold. We find in the minimal model the experimentally preferred effective Higgs couplings to gluon and photon at 95% confidence level disfavor the New Physics scale below 1.3 TeV. We demonstrate that a generalization of these models to include brane localized kinetic terms can relieve the tension to accommodate scales as low as 0.4 TeV.