Minimal Lee-Wick Extension of the Standard Model

TL;DR

This paper proposes a minimal Lee-Wick extension to the Standard Model, retaining key partners to address quadratic divergences, and explores their experimental constraints and potential detectability at the LHC.

Contribution

It introduces a minimal low-energy Lee-Wick model with specific partners, analyzing constraints and collider prospects within a unified framework.

Findings

LW states are within LHC reach at 95% confidence level.

Electroweak parameters constrain LW partner masses.

The model remains valid up to approximately 10 TeV.

Abstract

We consider a minimal Lee-Wick (LW) extension to the Standard Model in which the fields providing the most important contributions to the cancellation of quadratic divergences are the lightest. Partners to the SU(2) gauge bosons, Higgs, top quark, and left-handed bottom quark are retained in the low-energy effective theory, which is valid up to approximately 10 TeV; the remaining LW partners appear above this cutoff and complete the theory in the ultraviolet. We determine the constraints on the low-energy spectrum from the electroweak parameters S and T, and find LW states within the kinematic reach of the LHC at the 95% confidence level.