Simplified Models for Higgs Physics: Singlet Scalar and Vector-like Quark Phenomenology

TL;DR

This paper investigates a simplified model with a singlet scalar and vector-like quarks, analyzing their effects on Higgs physics and exploring potential signals for new physics at collider experiments.

Contribution

It introduces a combined analysis of Higgs data and new particle searches using a simplified model with a singlet scalar and vector-like quarks, highlighting novel decay modes and phenomenology.

Findings

Constraints from Higgs measurements limit model parameters.

New decay modes of top partners are identified.

Prospects for detecting new particles at Run II are discussed.

Abstract

Simplified models provide a useful tool to conduct the search and exploration of physics beyond the Standard Model in a model-independent fashion. In this work we consider the complementarity of indirect searches for new physics in Higgs couplings and distributions with direct searches for new particles, using a simplified model which includes a new singlet scalar resonance and vector-like fermions that can mix with the SM top-quark. We fit this model to the combined ATLAS and CMS 125 GeV Higgs production and coupling measurements and other precision electroweak constraints, and explore in detail the effects of the new matter content upon Higgs production and kinematics. We highlight some novel features and decay modes of the top partner phenomenology, and discuss prospects for Run II.