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| CMS-PAS-FTR-18-016 | ||
| Search for invisible decays of a Higgs boson produced through vector boson fusion at the High-Luminosity LHC | ||
| CMS Collaboration | ||
| November 2018 | ||
| Abstract: The search for a Higgs boson decaying to invisible particles, produced through the vector boson fusion mode in the High-Luminosity LHC proton-proton collisions at $\sqrt{s}= $ 14 TeV, is investigated based on simulation studies using Delphes, a fast-simulation package used to provide a parameterised response of the upgraded CMS detector. The event selection follows the existing CMS Run II data analysis, optimised for the High-Luminosity LHC conditions. The 95% confidence-level upper limits on the branching fraction of a standard-model-like Higgs boson decaying to invisible final states are studied with integrated luminosities of 300, 1000 and 3000 fb$^{-1}$ as a function of the thresholds applied on the transverse energy of the recoiling Higgs boson deposited in the detector. | ||
| Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
png pdf |
Figure 1:
$ {E_{\mathrm {T}}^{\text {miss}}} $ (left) and $ {\mathrm {H}_{\mathrm {T}}^{\mathrm {miss}}} $ (right) distributions in 200 PU VBF H signal samples, comparing full simulation (Phase 2) and Delphes. On the left, the distribution in Delphes is smeared as explained in the main text to reproduce the Phase 2 distribution. |
png pdf |
Figure 1-a:
$ {E_{\mathrm {T}}^{\text {miss}}} $ (left) and $ {\mathrm {H}_{\mathrm {T}}^{\mathrm {miss}}} $ (right) distributions in 200 PU VBF H signal samples, comparing full simulation (Phase 2) and Delphes. On the left, the distribution in Delphes is smeared as explained in the main text to reproduce the Phase 2 distribution. |
png pdf |
Figure 1-b:
$ {E_{\mathrm {T}}^{\text {miss}}} $ (left) and $ {\mathrm {H}_{\mathrm {T}}^{\mathrm {miss}}} $ (right) distributions in 200 PU VBF H signal samples, comparing full simulation (Phase 2) and Delphes. On the left, the distribution in Delphes is smeared as explained in the main text to reproduce the Phase 2 distribution. |
png pdf |
Figure 2:
Distributions of $|\Delta \eta _{\text {jj}}|$ and $|\Delta \phi _{\text {jj}}|$ in the signal region for the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV. |
png pdf |
Figure 2-a:
Distributions of $|\Delta \eta _{\text {jj}}|$ and $|\Delta \phi _{\text {jj}}|$ in the signal region for the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV. |
png pdf |
Figure 2-b:
Distributions of $|\Delta \eta _{\text {jj}}|$ and $|\Delta \phi _{\text {jj}}|$ in the signal region for the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV. |
png pdf |
Figure 3:
Distributions of $M_{\text {jj}}$ and min$\Delta \phi $(jet $ {p_{\mathrm {T}}} > $ 30 GeV, $ {E_{\mathrm {T}}^{\text {miss}}} $) in the signal region for the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV. |
png pdf |
Figure 3-a:
Distributions of $M_{\text {jj}}$ and min$\Delta \phi $(jet $ {p_{\mathrm {T}}} > $ 30 GeV, $ {E_{\mathrm {T}}^{\text {miss}}} $) in the signal region for the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV. |
png pdf |
Figure 3-b:
Distributions of $M_{\text {jj}}$ and min$\Delta \phi $(jet $ {p_{\mathrm {T}}} > $ 30 GeV, $ {E_{\mathrm {T}}^{\text {miss}}} $) in the signal region for the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV. |
png pdf |
Figure 4:
Distributions of $ {E_{\mathrm {T}}^{\text {miss}}} $ and $ {\mathrm {H}_{\mathrm {T}}^{\mathrm {miss}}} $ in the signal region for the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV. |
png pdf |
Figure 4-a:
Distributions of $ {E_{\mathrm {T}}^{\text {miss}}} $ and $ {\mathrm {H}_{\mathrm {T}}^{\mathrm {miss}}} $ in the signal region for the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV. |
png pdf |
Figure 4-b:
Distributions of $ {E_{\mathrm {T}}^{\text {miss}}} $ and $ {\mathrm {H}_{\mathrm {T}}^{\mathrm {miss}}} $ in the signal region for the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV. |
png pdf |
Figure 5:
Left: 95% CL limits on ${\text {B}({\mathrm {H}} \to \text {inv.})}$ as a function of the minimum threshold on $ {E_{\mathrm {T}}^{\text {miss}}} $, for $M_{\text {jj}} > $ 2500 GeV and an integrated luminosity of 3000 fb$^{-1}$. Right: 95% CL limits for scenarios with different integrated luminosities. |
png pdf |
Figure 5-a:
Left: 95% CL limits on ${\text {B}({\mathrm {H}} \to \text {inv.})}$ as a function of the minimum threshold on $ {E_{\mathrm {T}}^{\text {miss}}} $, for $M_{\text {jj}} > $ 2500 GeV and an integrated luminosity of 3000 fb$^{-1}$. Right: 95% CL limits for scenarios with different integrated luminosities. |
png pdf |
Figure 5-b:
Left: 95% CL limits on ${\text {B}({\mathrm {H}} \to \text {inv.})}$ as a function of the minimum threshold on $ {E_{\mathrm {T}}^{\text {miss}}} $, for $M_{\text {jj}} > $ 2500 GeV and an integrated luminosity of 3000 fb$^{-1}$. Right: 95% CL limits for scenarios with different integrated luminosities. |
| Tables | |
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Table 1:
Impact on the signal and background yields from the different sources of systematic uncertainty considered in Ref. [14] and for the HL-LHC setup considered in this analysis. |
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Table 2:
Number of events expected after the final selection, $M_{\text {jj}} > $ 2500 GeV and $ {E_{\mathrm {T}}^{\text {miss}}} > $ 190 GeV, with an integrated luminosity of 3000 fb$^{-1}$. The uncertainties are the statistical uncertainties from the Delphes samples. |
| Summary |
| The search for a Higgs boson decaying invisibly, produced in the vector-boson fusion mode, is investigated at the HL-LHC through simulation studies using a fast parametrisation of the upgraded CMS detector. The analysis follows the latest CMS publication, with an event selection optimised for the HL-LHC conditions. The expected 95% CL upper limits on the branching ratio of the standard model Higgs boson to invisible particles are presented as a function of the lower threshold applied on the transverse missing energy, for scenarios with integrated luminosities of 300, 1000 and 3000 fb$^{-1}$. The 95% CL upper limit on $ {\text{B}(\mathrm{H}\to \text{inv.})} $ assuming standard model production is expected to be at 3.8%, for thresholds values of 2500 GeV (190 GeV) on the dijet mass (missing transverse momentum). Even if the transverse missing energy resolution is degraded by a factor of two due to the high pileup conditions, a similar sensitivity is nevertheless achieved. |
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