Phenomenology of Partially Composite Standard Model

TL;DR

This paper introduces a partially composite Standard Model where electroweak bosons mix with strong sector resonances, affecting Higgs properties and constrained by electroweak data and LHC searches.

Contribution

It presents a novel model integrating weakly coupled electroweak sector with strong dynamics, including vector resonances and Higgs compositeness effects.

Findings

Constraints from electroweak precision tests are analyzed.

LHC searches for W' and Z' impose bounds on the model.

Higgs production and decay are modified by partial compositeness.

Abstract

We propose a model to describe the low energy physics of partially composite Standard Model, in which the electroweak sector in the Standard Model is weakly coupled to some strong dynamics. The vector resonances in the strong sector are introduced as the effective degrees of freedom, W' and Z', which mixes with the W and Z bosons through the electroweak symmetry breaking. Through the coupling to the strong sector, the Standard Model Higgs boson becomes partially composite, and its properties are modified. We study the constraints from the electroweak precision data and direct searches of W' and Z' at the LHC expriments, and discuss the effects on the production/decay properties of the Higgs boson.