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A novel search for exotic decays of the Higgs boson into pairs of long-livedneutral particles, each decaying into a bottom quark pair, is performed using139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV proton-proton collision data collectedwith the ATLAS detector at the LHC. Events consistent with the production of aHiggs boson in association with a leptonically decaying $Z$ boson are analysed.Long-lived particle (LLP) decays are reconstructed from inner-detector tracksas displaced vertices with high mass and track multiplicity relative toStandard Model processes. The analysis selection requires the presence of atleast two displaced vertices, effectively suppressing Standard Modelbackgrounds. The residual background contribution is estimated using adata-driven technique. No excess over Standard Model predictions is observed,and upper limits are set on the branching ratio of the Higgs boson to LLPs.Branching ratios above 10% are excluded at 95% confidence level for LLP meanproper lifetimes $c\tau$ as small as 4 mm and as large as 100 mm. For LLPmasses below 40 GeV, these results represent the most stringent constraint inthis lifetime regime.

the journal of high energy physics/the journal of high energy physics

Search for exotic decays of the Higgs boson into long-lived particles in  $pp$ collisions at $\sqrt{s} = 13$ TeV using displaced vertices in the ATLAS  inner detector