Phenomenological Aspects of Dirichlet Higgs Model from Extra-Dimension

TL;DR

This paper explores a five-dimensional Standard Model extension with a Dirichlet boundary condition on the Higgs, analyzing its phenomenology, including Higgs production, decay, and electroweak constraints at the LHC.

Contribution

It introduces a novel 5D Higgs model with Dirichlet boundary conditions, affecting Higgs mode structure and phenomenology, distinct from traditional models.

Findings

Modified Higgs mode structure due to boundary conditions

Predicted deviations in top Yukawa coupling

Constraints from electroweak precision data

Abstract

We study a simple five-dimensional extension of the Standard Model, compactified on a flat line segment in which there propagate Higgs and gauge bosons of the Standard Model. We impose a Dirichlet boundary condition on the Higgs field to realize its vacuum expectation value. Since a flat Nambu-Goldstone zero-mode of the bulk Higgs is eliminated by the Dirichlet boundary condition, a superposition of the Higgs Kaluza-Klein modes play the role of the Nambu-Goldstone boson except at the boundaries. We discuss phenomenology of our model at the LHC, namely the top Yukawa deviation and the production and decay of the physical Higgs field, as well as the constraints from the electroweak precision measurements.