Abstract

At the LHC, searches for rare and exotic decays of the Higgs boson constitute an excellent opportunity to look for new physics. Some theories predict exotic decays that are heavily suppressed in the Standard Model, such as the ones violating lepton flavor conservation. Other theories predict enhanced branching ratios for rare decay modes, such as the ones to a photon and a $Z$ boson, or to a photon and a meson. Recent searches performed with $\sqrt{s}=8$~TeV and $\sqrt{s}=13$~TeV $pp$ collisions recorded by the ATLAS detector are presented.

Highlights

  • The CMS and ATLAS collaborations have studied in great detail the 125 GeV boson whose discovery they announced on the 4th of July, 2012

  • Such a loose constraint leaves open the possibility that the Standard Model (SM) rare decays that have not been observed yet could be anomalously enhanced, or the possibility that unforeseen exotic decays might have sizeable branching ratios

  • Since the current constraint leave ample room for both phenomena, direct searches for exotic and rare decays of the Higgs boson constitute a very powerful approach to look for physics beyond the SM.√We report here s√earches performed with pp collision data recorded by the ATLAS detector [2] at s = 8 TeV and s = 13 TeV

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Summary

Introduction

The CMS and ATLAS collaborations have studied in great detail the 125 GeV boson whose discovery they announced on the 4th of July, 2012. The fit to obtain the coupling constants to SM fermions and gauge bosons can constrain, with some dependence on the assumptions made in the fit, the branching ratio (Br) for invisible or undetected Higgs boson decays From this fit, the 95% CL upper limit on the Br of the Higgs boson decaying to invisible or undetected final states can be as large as ≈ 30% [1]. The 95% CL upper limit on the Br of the Higgs boson decaying to invisible or undetected final states can be as large as ≈ 30% [1] Such a loose constraint leaves open the possibility that the SM rare decays that have not been observed yet could be anomalously enhanced, or the possibility that unforeseen exotic decays might have sizeable branching ratios.

Searches for Exotic Decays Violating Lepton Flavor Conservation
Searches for Rare Decays of the Higgs Boson
Conclusion

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