An Inclusive Search for the Decay of Boosted Higgs Bosons in the $H \rightarrow$ $b\overline{b}$ Channel with the ATLAS Detector

A search for high-momentum Higgs bosons, produced with an associated jet and decaying to bottom quark pairs, is conducted using an integrated luminosity of $80.5~\mathrm{fb}^{-1}$ of proton-proton collisions at $\sqrt{s} = 13~\mathrm{TeV}$ collected with the ATLAS detector at the Large Hadron Collider. The search for $H \rightarrow b\bar{b}$ is of particular importance, as current measurements of this decay channel contain large uncertainties and have not yet established evidence for the gluon-gluon fusion and vector boson fusion Higgs boson production modes. This is the first time this analysis has been performed with $\sqrt{s} = 13~\mathrm{TeV}$ at ATLAS and represents an important advancement in the use of boosted jet techniques including implementation of the Variable Radius jet algorithm. Furthermore, a novel $t\bar{t}$ control region strategy is implemented to correct the mismodeling of its normalization and is shown to constrain the associated large JES and JMR systematic uncertainties. For the Standard Model Higgs boson, the observed signal strength is $\mu_{H} = 5.8 \pm 3.1~\mathrm{(stat.)} \pm 1.9~\mathrm{(syst.)} \pm 1.7~\mathrm{(theo.)}$, which is $1.6$ standard deviations higher than the background-only hypothesis, with an expected sensitivity of $0.28\sigma.$