Search for Higgs boson decays into a pair of pseudoscalar particles in the 
$bbμμ$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ 
TeV

ATLAS Collaboration,

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Search for Higgs boson decays into a pair of pseudoscalar particles in the $bbμμ$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV

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ATLAS Collaboration,
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

ATLAS Collaboration (2022). Search for Higgs boson decays into a pair of pseudoscalar particles in the $bbμμ$ final state with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV. Physical Review D, 105, 012006. Retrieved from https://publications.mppmu.mpg.de/?action=search&mpi=MPP-2021-176.

Cite as: https://hdl.handle.net/21.11116/0000-000C-B49B-A

Abstract

This paper presents a search for decays of the Higgs boson with a mass of 125 GeV into a pair of new pseudoscalar particles, $H\rightarrow aa$, where one $a$-boson decays into a $b$-quark pair and the other into a muon pair. The search uses 139 fb$^{-1}$ of proton-proton collision data at a center-of-mass energy of $\sqrt{s}=13$ TeV recorded between 2015 and 2018 by the ATLAS experiment at the LHC. A narrow dimuon resonance is searched for in the invariant mass spectrum between 16 GeV and 62 GeV. The largest excess of events above the Standard Model backgrounds is observed at a dimuon invariant mass of 52 GeV and corresponds to a local (global) significance of $3.3 \sigma$ ($1.7 \sigma$). Upper limits at 95% confidence level are placed on the branching ratio of the Higgs boson to the $bb\mu\mu$ final state, $\mathcal{B}(H\rightarrow aa\rightarrow bb\mu\mu)$, and are in the range $\text{(0.2-4.0)} \times 10^{-4}$, depending on the signal mass hypothesis.