New Higgs decays to axion-like particles

Abstract

We investigate the interactions of a light scalar with the Higgs boson and second-generation fermions, which trigger new rare decays of the Higgs boson into $4\mu$, $2\mu 2\gamma$, $6\mu$ and $4\mu 2j$. We recast current LHC searches to constrain these decays and develop new collider analyses for those channels which are only poorly tested by existing studies. With the currently collected data we can probe branching ratios as small as $1.5\times 10^{-5}$, $8.7\times 10^{-5}$, $5.7\times 10^{-8}$ and $1.6\times 10^{-7}$, respectively. For the High-Luminosity LHC run, considered here to involve 3 ab${}^{-1}$ of integrated luminosity, these numbers go down to $1.3\times 10^{-5}$, $2.0\times 10^{-6}$, $3.0\times 10^{-9}$ and $5.4\times 10^{-9}$, respectively. We also comment on other channels that remain still unexplored.

8 pages, 7 figures

References in corpus (10)

• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• New Fixed-Target Experiments to Search for Dark Gauge Forces
• New Limits on Hidden Photons from Past Electron Beam Dumps
• Contributions of axion-like particles to lepton dipole moments
• Running in the ALPs
• A search for the $Z\gamma$ decay mode of the Higgs boson in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• New Probes for Axion-like Particles at Hadron Colliders
• A fresh look at ALP searches in fixed target experiments
• Microwave cavity light shining through a wall optimization and experiment
• MUSiC: a model-unspecific search for new physics in proton-proton collisions at $\sqrt{s}=$ 13 TeV