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CMS-PAS-FTR-18-035
Projection of searches for exotic Higgs boson decays to light pseudoscalars for the High-Luminosity LHC
Abstract: This Physics Analysis Summary details the projections of two searches for exotic decays of the Higgs boson from LHC Run 2 to the High-Luminosity LHC. Decays to a pair of light pseudoscalar bosons are explored, in the final states of two τ leptons and two muons, or two τ leptons and two b quarks. The projections are based on analyses that use 35.9 fb1 proton-proton collision data recorded at a center-of-mass energy of 13 TeV in 2016. Integrated luminosities of up to 3000 fb1 are considered in the projections, with different scenarios for the extrapolation of the systematic uncertainties.
Figures & Tables Summary References CMS Publications
Figures

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Figure 1:
Left: Projected expected limits on (σ(h)/σSM) times the branching fraction for haa2b2τ, for 36, 300, and 3000 fb1. Right: Projected expected limits (σ(h)/σSM)B(haa2τ2b), comparing different scenarios for systematic uncertainties for an integrated luminosity of 3000 fb1.

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Figure 1-a:
Projected expected limits on (σ(h)/σSM) times the branching fraction for haa2b2τ, for 36, 300, and 3000 fb1.

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Figure 1-b:
Projected expected limits (σ(h)/σSM)B(haa2τ2b), comparing different scenarios for systematic uncertainties for an integrated luminosity of 3000 fb1.

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Figure 2:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2b2τ final state in 2HDM+S type-1 (top left), type-2 (top right), type-3 (bottom left), and type-4 (bottom right).

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Figure 2-a:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2b2τ final state in 2HDM+S type-1.

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Figure 2-b:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2b2τ final state in 2HDM+S type-2.

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Figure 2-c:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2b2τ final state in 2HDM+S type-3.

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Figure 2-d:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2b2τ final state in 2HDM+S type-4.

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Figure 3:
Left: Projected expected limits on (σ(h)/σSM)B(haa2μ2τ), for 36, 300, and 3000 fb1. Right: Projected expected limits on (σ(h)/σSM)B(haa2μ2τ), comparing different scenarios for systematic uncertainties for an integrated luminosity of 3000 fb1.

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Figure 3-a:
Projected expected limits on (σ(h)/σSM)B(haa2μ2τ), for 36, 300, and 3000 fb1.

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Figure 3-b:
Projected expected limits on (σ(h)/σSM)B(haa2μ2τ), comparing different scenarios for systematic uncertainties for an integrated luminosity of 3000 fb1.

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Figure 4:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2μ2τ final state in 2HDM+S type-1 (top left), type-2 (top right), type-3 (bottom left), and type-4 (bottom right).

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Figure 4-a:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2μ2τ final state in 2HDM+S type-1.

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Figure 4-b:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2μ2τ final state in 2HDM+S type-2.

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Figure 4-c:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2μ2τ final state in 2HDM+S type-3.

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Figure 4-d:
Expected upper limits on (σ(h)/σSM)B(haa) for 3000 fb1 of data with YR18 systematic uncertainties for the 2μ2τ final state in 2HDM+S type-4.
Tables

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Table 1:
The sources of systematic uncertainty for which limiting values are applied in the ''YR18 systematics uncertainties'' scenario. Systematic uncertainties of the reference Run 2 analyses are described in Refs. [1,2].
Summary
Recent searches for exotic decays of the Higgs boson performed with 35.9 fb1 of data collected at 13 TeV [1,2] have been projected to integrated luminosities of up to 3000 fb1, achievable at the High-Luminosity LHC. They target decays of the Higgs boson to a pair of light pseudoscalars in the final states with two τ leptons and two muons, or two b quarks and two muons. The integrated luminosity of 3000 fb1 will improve the sensitivity by about an order of magnitude for the search in the 2b2τ final state. The improvement is larger in the 2μ2τ final state and scales almost linearly with the integrated luminosity for pseudoscalar masses close to 15 GeV.
References
1 CMS Collaboration Search for an exotic decay of the Higgs boson to a pair of light pseudoscalars in the final state with two b quarks and two τ leptons in proton-proton collisions at s= 13 TeV PLB 785 (2018) 462 CMS-HIG-17-024
1805.10191
2 CMS Collaboration Search for an exotic decay of the Higgs boson to a pair of light pseudoscalars in the final state of two muons and two τ leptons in proton-proton collisions at s= 13 TeV JHEP 11 (2018) 018 CMS-HIG-17-029
1805.04865
3 D. Curtin et al. Exotic decays of the 125 GeV Higgs boson PRD 90 (2014) 075004 1312.4992
4 CMS Collaboration The CMS Experiment at the CERN LHC JINST 3 (2008) S08004 CMS-00-001
5 G. Apollinari, B. O., T. Nakamoto, and L. Rossi High Luminosity Large Hadron Collider HL-LHC CERN Yellow Report (2015), no. 5, 1 1705.08830
6 D. Contardo et al. Technical Proposal for the Phase-II Upgrade of the CMS Detector CERN-LHCC-2015-010, LHCC-P-008, CMS-TDR-15-02
7 K. Klein The Phase-2 Upgrade of the CMS Tracker CERN-LHCC-2017-009, CMS-TDR-014
8 CMS Collaboration The Phase-2 Upgrade of the CMS Barrel Calorimeters Technical Design Report CDS
9 CMS Collaboration The Phase-2 Upgrade of the CMS Endcap Calorimeter CDS
10 CMS Collaboration The Phase-2 Upgrade of the CMS Muon Detectors CDS
11 CMS Collaboration Expected performance of the physics objects with the upgraded CMS detector at the HL-LHC CDS
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