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Search for physics beyond the standard model in events with Higgs bosons and missing transverse momentum in proton-proton collisions at $\sqrt{s}= $ 13 TeV
Abstract: A search for physics beyond the standard model in events with one or more high-momentum Higgs bosons H decaying to pairs of b quarks in association with missing transverse momentum is presented. The data, corresponding to an integrated luminosity of 35.9 fb$^{-1}$, were collected with the CMS detector at the LHC in proton-proton collisions at the center-of-mass energy $\sqrt{s}= $ 13 TeV. The analysis utilizes a new b quark tagging technique based on jet substructure to identify jets from $H\rightarrow b\overline{b}$. Events are categorized by the multiplicity of H-tagged jets, jet mass, and the missing transverse momentum. No significant deviation from standard model expectations is observed. In the context of supersymmetry (SUSY), limits on the cross sections of pair-produced gluinos are set, assuming that gluinos decay to quark pairs, H (or Z), and the lightest SUSY particle LSP through an intermediate next-to-lightest SUSY particle NLSP. With large mass splitting between the NLSP and LSP, and 100% NLSP branching fraction to H, the lower limit on the gluino mass is found to be 2010 GeV.
Figures & Tables Summary References CMS Publications

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Figure 1:
Diagram for production of Higgs bosons via gluino pair production. We also consider channels in which a Z boson is substituted for H in one of the gluino decays.

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Figure 2:
Observed and expected distributions of the leading $ {p_{\mathrm {T}}} $ jet mass for selected 1H and 2H events with $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 300 GeV. The subleading jet is required to have $ {m_{\text {J}}} $ within the signal window denoted by vertical dashed magenta lines. The shape and composition of SM contributions are modeled with simulations while the overall normalization is scaled to the prediction in the signal window. A representative signal is shown stacked on top of the backgrounds. The bottom panel shows the ratio of the observed to SM-expected yields.

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Figure 3:
Observed and expected cross section upper bounds at 95%CL for the T5HH and T5HZ models. The solid and dashed black lines show the gluino-gluino production SMS cross section with its uncertainty. The solid red (blue) line shows the observed limit for the T5HH (T5HZ) model; for each the like-colored dashed line and shaded band show the expected limit and the range associated with the experimental uncertainties.

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Table 1:
Observed event yields, standard model background predictions, and correction factors, for the signal regions $A_{N_\mathrm{H}}$. The uncertainties in the predictions include both statistical and systematic contributions.
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