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Hiding the Higgs at the LHC

Omri Bahat-Treidel, Yuval Grossman, Yoram Rozen

Abstract

We study a simple extension of the standard model where scalar singlets that mix with the Higgs doublet are added. This modification to the standard model could have a significant impact on Higgs searches at the LHC. The Higgs doublet is not a mass eigenstate and therefore the expected nice peak of the standard model Higgs disappears. We analyze this scenario finding the required properties of the singlets in order to make the Higgs "invisible" at the LHC. In some part of the parameter space even one singlet could make the discovery of the SM Higgs problematic. In other parts, the Higgs can be discovered even in the presence of many singlets.

Hiding the Higgs at the LHC

Abstract

We study a simple extension of the standard model where scalar singlets that mix with the Higgs doublet are added. This modification to the standard model could have a significant impact on Higgs searches at the LHC. The Higgs doublet is not a mass eigenstate and therefore the expected nice peak of the standard model Higgs disappears. We analyze this scenario finding the required properties of the singlets in order to make the Higgs "invisible" at the LHC. In some part of the parameter space even one singlet could make the discovery of the SM Higgs problematic. In other parts, the Higgs can be discovered even in the presence of many singlets.

Paper Structure

This paper contains 8 sections, 9 equations, 1 figure.

Table of Contents

  1. Introduction
  2. The model
  3. Phenomenology of the model
  4. Examples
  5. $H\rightarrow ZZ\rightarrow 4\ell$
  6. $H\rightarrow WW^*\rightarrow l\nu l\nu$
  7. Hiding the Higgs at the LHC
  8. Discussion and conclusions

Figures (1)

  • Figure 1: Significance of the most significant singlet in 20-50 singlets toy Monte Carlo experiments. The vertical line at $\sigma=5$ represents the discovery threshold. See text for details.