Inclusive search for highly boosted Higgs bosons decaying to bottom quark-antiquark pairs in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A search for standard model Higgs bosons (H) produced with transverse momentum ($p_{\mathrm{T}}$) greater than 450 GeV and decaying to bottom quark-antiquark pairs ($\mathrm{b}\bar{\mathrm{b}}$) is performed using proton-proton collision data collected by the CMS experiment at the LHC at $\sqrt{s}=$ 13 TeV. The data sample corresponds to an integrated luminosity of 137 fb${}^{-1}$. The search is inclusive in the Higgs boson production mode. Highly Lorentz-boosted Higgs bosons decaying to $\mathrm{b}\bar{\mathrm{b}}$ are reconstructed as single large-radius jets, and are identified using jet substructure and a dedicated b tagging technique based on a deep neural network. The method is validated with Z $\to$ $\mathrm{b}\bar{\mathrm{b}}$ decays. For a Higgs boson mass of 125 GeV, an excess of events above the background assuming no Higgs boson production is observed with a local significance of 2.5 standard deviations ($\sigma$), while the expectation is 0.7. The corresponding signal strength and local significance with respect to the standard model expectation are ${\mu }_{\mathrm{H}}$ $=$ 3.7 $\pm$ 1.2 (stat) ${}_{-0.7}^{+0.8}$ (syst) ${}_{-0.5}^{+0.8}$ (theo) and 1.9 $\sigma$. Additionally, an unfolded differential cross section as a function of Higgs boson $p_{\mathrm{T}}$ for the gluon fusion production mode is presented, assuming the other production modes occur at the expected rates.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIG-19-003 (CMS Public Pages)

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