Search for Higgs boson decays into a pair of light bosons in the $bb\mu \mu$ final state in $pp$ collision at $\sqrt{s}=$13 TeV with the ATLAS detector

Abstract

A search for decays of the Higgs boson into a pair of new spin-zero particles, $H\to aa$, where the $a$-bosons decay into a $b$-quark pair and muon pair, is presented. The search uses 36.1 fb${}^{-1}$ of proton-proton collision data at $\sqrt{s}=13$ TeV recorded by the ATLAS experiment at the LHC in 2015 and 2016. No significant deviation from the Standard Model prediction is observed. Upper limits at 95% confidence level are placed on the branching ratio $({\sigma }_H/{\sigma }_{SM})\times B(H\to aa\to bb\mu \mu )$, ranging from $2\times 10^{-4}$ to $10^{-3}$ in the $a$-boson mass range of 20-60 GeV. Model-independent limits are set on the visible production cross-section times the branching ratio to the $bb\mu \mu$ final state for new physics, ${\sigma }_{vis}(X)\times B(X\to bb\mu \mu )$, ranging from 0.1 fb to 0.73 fb for $m_{\mu \mu }$ between 18 and 62 GeV.

36 pages in total, author list starting page 20, 6 figures, 2 tables, submitted to Phys. Lett. B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2016-03/

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