CMS-PAS-FTR-18-003

CMS-PAS-FTR-18-003
Search for vector boson fusion production of a massive resonance decaying to a pair of Higgs bosons in the four b quark final state at the HL-LHC using the CMS Phase 2 detector
CMS Collaboration
July 2018

Abstract: The prospects of a search for a massive resonance produced through vector boson fusion and decaying to a pair of standard model Higgs bosons at the high luminosity LHC at CERN is explored. Simulated events from proton-proton collisions at a centre-of-mass energy of 14 TeV collected by the upgraded CMS detector are used. Both the Higgs bosons are assumed to decay to a b quark-antiquark pair, each. For a high mass resonance, the Higgs bosons are highly Lorentz-boosted and are each reconstructed as a large-area jet. The signal also contains two energetic jets in the forward regions of the detector. The expected signal significances for a bulk graviton in warped extradimensional models, having a mass between 1500 and 3000 GeV and a narrow width compared to its mass, is presented, assuming a cross section of 1 fb, for a data set corresponding to an integrated luminosity of 3.0 ab$^{-1}$.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ;

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: The vector boson fusion mode of production of a resonance $ {\mathrm {X}}$ decaying to a pair of Higgs bosons $ {\mathrm {H}} $, with both Higgs bosons decaying to $ {{\mathrm {b}} {\overline {\mathrm {b}}}} $ pairs.
png pdf	Figure 2: The estimated multijet background and the signal $ {m_{\text {jj}}} $ distributions for bulk gravitons (BG) of masses 1500, 2000, and 3000 GeV, assuming a signal cross section of 1 fb. The distributions on the left are for the 3b and those on the right are for the 4b subjet b-tagged categories and for an average pileup of 200.
png pdf	Figure 2-a: The estimated multijet background and the signal $ {m_{\text {jj}}} $ distributions for bulk gravitons (BG) of masses 1500, 2000, and 3000 GeV, assuming a signal cross section of 1 fb. The distributions on the left are for the 3b and those on the right are for the 4b subjet b-tagged categories and for an average pileup of 200.
png pdf	Figure 2-b: The estimated multijet background and the signal $ {m_{\text {jj}}} $ distributions for bulk gravitons (BG) of masses 1500, 2000, and 3000 GeV, assuming a signal cross section of 1 fb. The distributions on the left are for the 3b and those on the right are for the 4b subjet b-tagged categories and for an average pileup of 200.
png pdf	Figure 3: The expected signal significance for Bulk Gravitons of masses 1500, 2000, and 3000 GeV, assuming a production cross section of 1 fb. The data set corresponds to an integrated luminosity of 3 ab$^{-1}$ and with a pileup of 200.

Tables

png pdf

Table 1:
Event yields and efficiencies for the signal and multijet background for an average pileup of 200. The product of the cross sections and branching fractions of the signals $\sigma ({\mathrm {p}} {\mathrm {p}}\to {\mathrm {X}}\text {jj} \to {\mathrm {H}} {\mathrm {H}} \text {jj})$ is assumed to be 1 fb. Owing to the large sample sizes of the simulated events, the statistical uncertainties are small.

Summary

The vector boson fusion production mode for diboson resonances is extremely challenging to probe using the current data because of its small cross section. The search for these processes are however feasible at the high luminosity LHC, and we present here the search for a massive spin-2 bulk graviton decaying to two Higgs bosons. The bulk gravitons are predicted in various new physics scenarios like the warped extradimensional models, which aim to explain the so-called hierarchy problem of the standard model. The search focuses on the final state where both the Higgs bosons decay to b quark-antiquark pairs that are boosted, thus forming Higgs jets. Assuming a signal production cross section of 1 fb, with a data set corresponding to an integrated luminosity of 3 ab$^{-1}$ in proton-proton collisions at the at a centre-of-mass of 14 TeV, the CMS experiment should be able to find the evidence for the presence of a bulk graviton of mass between 1500 and 3000 GeV. It is expected that future advances in the event reconstruction and physics object identification techniques, spurred on by the Phase 2 CMS detector design, will help improve these projections even further.

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