Inclusive search for highly boosted Higgs bosons decaying to bottom quark-antiquark pairs in proton-proton collisions at √s = 13 TeV

Abstract

A search for standard model Higgs bosons (H) produced with transverse momentum (p T) greater than 450 GeV and decaying to bottom quark-antiquark pairs ( b b ¯ $$ \mathrm{b}\overline{\mathrm{b}} $$ ) is performed using proton-proton collision data collected by the CMS experiment at the LHC at s $$ \sqrt{s} $$ = 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 b b ¯ $$ \mathrm{b}\overline{\mathrm{b}} $$ 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 → b b ¯ $$ \mathrm{b}\overline{\mathrm{b}} $$ 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 (σ), while the expectation is 0.7. The corresponding signal strength and local significance with respect to the standard model expectation are μ H = 3.7 ± 1.2(stat) − 0.7 + 0.8 $$ {}_{-0.7}^{+0.8} $$ (syst) − 0.5 + 0.8 $$ {}_{-0.5}^{+0.8} $$ (theo) and 1.9 σ. Additionally, an unfolded differential cross section as a function of Higgs boson p T for the gluon fusion production mode is presented, assuming the other production modes occur at the expected rates.