Muon Magnetic Moment and the Goldstone Boson Higgs

TL;DR

This paper calculates the muon magnetic moment correction in models where the Higgs is a pseudo-Goldstone boson with partially composite leptons, showing potential to explain the experimental anomaly without conflicting with collider bounds.

Contribution

It introduces a general effective Lagrangian framework demonstrating how composite fermions can produce sizable contributions to muon magnetic moment in Goldstone Higgs models.

Findings

Composite fermions can account for the muon g-2 discrepancy.

Derivative Higgs interactions do not alter Higgs-lepton couplings.

The model avoids LHC bounds due to non-light fermions.

Abstract

We compute the correction to the muon magnetic moment in theories where the Higgs is a pseudo-Goldstone boson and leptons are partially composite. Using a general effective lagrangian we show that in some regions of parameters a sizable new physics contribution to the magnetic moment can be obtained from composite fermions that could explain the 3.5$\sigma$ experimental discrepancy from the Standard Model prediction. This effect depends on the derivative interactions of the Higgs that do not modify the coupling of the Higgs to leptons and it does not require extremely light fermions, allowing to easily avoid LHC bounds. Our derivations can be in general applied to dipole operators in theories with Goldstone boson Higgs.