Constraints from muon g-2 and LFV processes in the Higgs Triplet Model

TL;DR

This paper analyzes constraints from muon g-2 and lepton flavor violation in the Higgs Triplet Model, clarifying contribution signs and identifying the most stringent bounds on model parameters from various processes.

Contribution

It provides a detailed translation of experimental constraints into bounds on model parameters and clarifies the sign discrepancy in muon g-2 contributions within the Higgs Triplet Model.

Findings

Muon to e gamma and tau decays impose stronger bounds than mu to eee.

The sign discrepancy in muon g-2 contributions is clarified.

Certain LFV processes provide more stringent constraints on v_Delta*m_H++.

Abstract

Constraints from the muon anomalous magnetic dipole moment and lepton flavor violating processes are translated into lower bounds on v_Delta*m_H++ in the Higgs Triplet Model by considering correlations through the neutrino mass matrix. The discrepancy of the sign of the contribution to the muon anomalous magnetic dipole moment between the measurement and the prediction in the model is clarified. It is shown that mu to e gamma, tau decays (especially, tau to mu e e), and the muonium conversion can give a more stringent bound on v_Delta*m_H++ than the bound from mu to eee which is expected naively to give the most stringent one.