Lessons from ATLAS and CMS measurements of Higgs boson decays to second generation fermions

TL;DR

This paper reviews recent experimental results on Higgs decays to second generation fermions, analyzing their implications for various extensions of the Standard Model and effective field theories.

Contribution

It provides a comprehensive analysis of Higgs decay measurements to second generation fermions within multiple theoretical frameworks, highlighting their impact on new physics models.

Findings

Evidence for Higgs decay to muons confirmed.

Constraints on Higgs to charm decays tightened.

Implications for Standard Model extensions discussed.

Abstract

There is now experimental evidence for Higgs boson decay into a pair of muons, and significant constraints on the Higgs boson decay into a charm quark-antiquark pair. The data on Higgs boson decays into second generation fermions probes various extensions of the Standard Model. We analyze the implications for the Standard Model effective field theory (SMEFT), without and with minimal flavor violation (MFV), for two Higgs doublet models (2HDM) with natural flavor conservation (NFC), for models with vector-like fermions, and for specific models that predict significant modifications of the Yukawa couplings to the light generations.