What if BR(h-->\mu\mu)/BR(h-->\tau\tau) does not equal m_\mu^2/m_\tau^2?

TL;DR

This paper explores how precise measurements of the Higgs boson decay rates into different lepton pairs can reveal underlying flavor physics and distinguish between various theoretical models.

Contribution

It introduces a framework for using Higgs decay measurements to differentiate among flavor models like natural flavor conservation, minimal flavor violation, and Froggatt-Nielsen symmetry.

Findings

Decay rate ratios can test flavor model predictions.

Measurement of h→μμ and h→ττ decays can reveal flavor violation.

Different flavor models predict distinct decay rate patterns.

Abstract

Measurements of the Yukawa couplings of the recently discovered boson h to fermion pairs will provide a new arena for studying flavor physics. We analyze the lessons that can be learned by measuring the h decay rates into the charged lepton pairs, \tau\tau, \mu\mu, and \tau\mu. We demonstrate how this set of measurements can distinguish in principle between various classes of flavor models such as natural flavor conservation, minimal flavor violation, and Froggatt-Nielsen symmetry.