Electroweak precision constraints on the Lee-Wick Standard Model

TL;DR

This paper analyzes how the Lee-Wick Standard Model fits with electroweak precision data, identifying parameter regions with potentially observable Lee-Wick particles and proposing an extension with a fourth generation.

Contribution

It provides the first detailed constraints on Lee-Wick Standard Model parameters from electroweak data and introduces a simple extension with a fourth generation to improve compatibility.

Findings

Fermionic Lee-Wick states can be as light as 2.4-3.5 TeV.

The extended model allows Lee-Wick fermions at 0.4-1.5 TeV.

Electroweak constraints can be satisfied with Lee-Wick gauge masses around 3 TeV.

Abstract

We present the constraints on the parameter space of the Lee-Wick Standard Model coming from electroweak precision observables. The model predicts a large positive S and a negative T. We show that it is possible to find some regions in parameter space with a fermionic state as light as 2.4-3.5 TeV. We also propose a simple extension of the model including a fourth generation. In this case it is possible to pass the electroweak constraints with Lee-Wick fermionic masses of order 0.4-1.5 TeV and Lee-Wick gauge masses of order 3 TeV.