Higgs After the Discovery: A Status Report

TL;DR

This paper reviews the status of the Higgs boson after its discovery, analyzing collider data within various new physics models to understand potential deviations from the Standard Model.

Contribution

It provides a comprehensive analysis of Higgs data in the context of simplified new physics models, constraining theories beyond the Standard Model.

Findings

Current data are consistent with the Standard Model Higgs boson.

Models with extended Higgs sectors are highly constrained.

No significant deviations from the Standard Model are observed.

Abstract

Recently, the ATLAS and CMS collaborations have announced the discovery of a 125 GeV particle, commensurable with the Higgs boson. We analyze the 2011 and 2012 LHC and Tevatron Higgs data in the context of simplified new physics models, paying close attention to models which can enhance the diphoton rate and allow for a natural weak-scale theory. Combining the available LHC and Tevatron data in the ZZ* 4-lepton, WW* 2-lepton, diphoton, and b-bbar channels, we derive constraints on the effective low-energy theory of the Higgs boson. We map several simplified scenarios to the effective theory, capturing numerous new physics models such as supersymmetry, composite Higgs, dilaton. We further study models with extended Higgs sectors which can naturally enhance the diphoton rate. We find that the current Higgs data are consistent with the Standard Model Higgs boson and, consequently, the parameter space in all models which go beyond the Standard Model is highly constrained.