Inclusive Search for a Highly Boosted Higgs Boson Decaying to a Bottom Quark-Antiquark Pair

Abstract

An inclusive search for the standard model Higgs boson (H) produced with large transverse momentum (p_{T}) and decaying to a bottom quark-antiquark pair (bb[over ¯]) is performed using a data set of pp collisions at sqrt[s]=13 TeV collected with the CMS experiment at the LHC. The data sample corresponds to an integrated luminosity of 35.9 fb^{-1}. A highly Lorentz-boosted Higgs boson decaying to bb[over ¯] is reconstructed as a single, large radius jet, and it is identified using jet substructure and dedicated b tagging techniques. The method is validated with Z→bb[over ¯] decays. The Z→bb[over ¯] process is observed for the first time in the single-jet topology with a local significance of 5.1 standard deviations (5.8 expected). For a Higgs boson mass of 125 GeV, an excess of events above the expected background is observed (expected) with a local significance of 1.5 (0.7) standard deviations. The measured cross section times branching fraction for production via gluon fusion of H→bb[over ¯] with reconstructed p_{T}>450 GeV and in the pseudorapidity range -2.5<η<2.5 is 74±48(stat)_{-10}^{+17}(syst) fb, which is consistent within uncertainties with the standard model prediction.

Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios

“…Indeed, this experimental endeavor may reveal first signs of new physics beyond the SM (BSM), as many well-motivated BSM extensions affect the phenomenology of the observed scalar particle. However, by the end of Run-II of the LHC, with the full collected data of ∼ 150 fb −1 per experiment (ATLAS and CMS) still being analyzed, Higgs signal rate measurements in various production and decay channels [10][11][12][13][14][15][16][17][18][19][20] are so far in very good agreement with the SM predictions.…”

H + 1 jet production revisited

“…and drop any jet requirement, replacing this with the cut p H T > 450 GeV. Here we choose to quote cross-sections that do not include any pseudo-rapidity cut on the Higgs boson, in contrast to the CMS analysis [37]. We note instead that such a cut has almost no effect on the theoretical calculation, reducing the cross-section by 0.1%.…”

Let there be light from a second light Higgs doublet

“…We add that the decay products in H → bb could in principle be reconstructed as a single, large radius high-p T jet and identified using jet substructure and dedicated b-tagging techniques. In fact, such a study has been recently performed by CMS [34], observing (bounding) Z → bb (h → bb) decays in the single-jet topology for the first time. However, the large Z → bb background and the poor mass resolution of the reconstructed jet mass suggest that detecting the small pp → H → bb signal expected in (3.1) is impossible at the LHC even at high luminosity.…”