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Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at $\sqrt{s} =$ 13 TeV

The collaboration
CMS-EXO-20-004, 2021.

Abstract
A search is presented for new particles produced at the LHC in proton-proton collisions at $\sqrt{s}=$ 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 fb$^{-1}$, collected in 2017-2018 with the CMS detector. Machine learning techniques are used to define separate categories for events with narrow jets from initial-state radiation and events with large-radius jets consistent with a hadronic decay of a W or Z boson. A statistical combination is made with an earlier search based on a data sample of 36 fb$^{-1}$, collected in 2016. No significant excess of events is observed with respect to the standard model background expectation determined from control samples in data. The results are interpreted in terms of limits on the branching fraction of an invisible decay of the Higgs boson, as well as constraints on simplified models of dark matter, on first-generation scalar leptoquarks decaying to quarks and neutrinos, and on models with large extra dimensions. Several of the new limits, specifically for spin-1 dark matter mediators, pseudoscalar mediators, colored mediators, and leptoquarks, are the most restrictive to date.

• #### Signal templates, DMsimp, spin-1, Monojet

Supplementary material

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Differential signal yields for various signal hypotheses.

• #### Signal templates, DMsimp, spin-0, Monojet

Supplementary material

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Differential signal yields for various signal hypotheses.

• #### Signal templates, ADD, Monojet

Supplementary material

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Differential signal yields for various signal hypotheses.

• #### Signal templates, LQ, Monojet

Supplementary material

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Differential signal yields for various signal hypotheses.

• #### Signal templates, DMsimp, spin-1, Mono-V ($\tau_{21}$)

Supplementary material

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Differential signal yields for various signal hypotheses.

• #### Signal templates, DMsimp, spin-0, Mono-V ($\tau_{21}$)

Supplementary material

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Differential signal yields for various signal hypotheses.

• #### Signal templates, ADD, Mono-V ($\tau_{21}$)

Supplementary material

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Differential signal yields for various signal hypotheses.

• #### Signal templates, LQ, Mono-V ($\tau_{21}$)

Supplementary material

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Differential signal yields for various signal hypotheses.

• #### Yields (Mono-V (high purity))

Data from Figs. 3, 4, as well as supplementary material.

10.17182/hepdata.106115.v1/t9

Background and data yields in the control and signal region bins. The prediction before ("prefit") and after the background only...

• #### Yields (Mono-V (low purity))

Data from Figs. 3, 4, as well as supplementary material.

10.17182/hepdata.106115.v1/t10

Background and data yields in the control and signal region bins. The prediction before ("prefit") and after the background only...

• #### Yields (Monojet)

Data from Figs. 3, 4, as well as supplementary material.

10.17182/hepdata.106115.v1/t11

Background and data yields in the control and signal region bins. The prediction before ("prefit") and after the background only...

• #### Simplified likelihood: covariance matrix (Monojet + mono-V)

Supplementary material

10.17182/hepdata.106115.v1/t12

Matrix of covariance coefficients between signal region bins. The coefficients are obtained from the background-only fit to the control regions,...

• #### Simplified likelihood: Yields (Monojet + mono-V)

Supplementary material

10.17182/hepdata.106115.v1/t13

Background prediction and observed data yields in the signal region bins. The background yields are obtained from the background-only fit...

• #### Simplified likelihood: covariance matrix (Monojet)

Supplementary material

10.17182/hepdata.106115.v1/t14

Matrix of covariance coefficients between signal region bins. The coefficients are obtained from the background-only fit to the control regions,...

• #### Simplified likelihood: Yields (Monojet)

Supplementary material

10.17182/hepdata.106115.v1/t15

Background prediction and observed data yields in the signal region bins. The background yields are obtained from the background-only fit...

• #### Simplified likelihood: covariance matrix (Mono-V)

Supplementary material

10.17182/hepdata.106115.v1/t16

Matrix of covariance coefficients between signal region bins. The coefficients are obtained from the background-only fit to the control regions,...

• #### Simplified likelihood: Yields (Mono-V)

Supplementary material

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Background prediction and observed data yields in the signal region bins. The background yields are obtained from the background-only fit...

• #### Cut flow for Monojet, Fermion portal

Supplementary material

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Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Monojet, ADD

Supplementary material

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Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Monojet, DM, spin-1 mediator

Supplementary material

10.17182/hepdata.106115.v1/t20

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Monojet, DM, spin-0 mediator

Supplementary material

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Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Monojet, Higgs portal

Supplementary material

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Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Monojet, Leptoquark

Supplementary material

10.17182/hepdata.106115.v1/t23

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (low purity), Fermion portal

Supplementary material

10.17182/hepdata.106115.v1/t24

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (low purity), ADD

Supplementary material

10.17182/hepdata.106115.v1/t25

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (low purity), DM, spin-1 mediator

Supplementary material

10.17182/hepdata.106115.v1/t26

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (low purity), DM, spin-0 mediator

Supplementary material

10.17182/hepdata.106115.v1/t27

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (low purity), Higgs portal

Supplementary material

10.17182/hepdata.106115.v1/t28

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (low purity), Leptoquark

Supplementary material

10.17182/hepdata.106115.v1/t29

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (high purity), Fermion portal

Supplementary material

10.17182/hepdata.106115.v1/t30

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (high purity), ADD

Supplementary material

10.17182/hepdata.106115.v1/t31

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (high purity), DM, spin-1 mediator

Supplementary material

10.17182/hepdata.106115.v1/t32

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (high purity), DM, spin-0 mediator

Supplementary material

10.17182/hepdata.106115.v1/t33

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (high purity), Higgs portal

Supplementary material

10.17182/hepdata.106115.v1/t34

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### Cut flow for Mono-V (high purity), Leptoquark

Supplementary material

10.17182/hepdata.106115.v1/t35

Unweighted signal acceptance times efficiency at every cut stage. The requirements called "HCAL mitigation" refer to the requirements imposed in...

• #### 2D exclusion contour, axial, Median Expected

Data from Fig. 6

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Median Expected exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the simplified model with axial couplings.

• #### 2D exclusion contour, axial, Observed

Data from Fig. 6

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Observed exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the simplified model with axial couplings.

• #### 2D exclusion contour, axial, Expected plus 1 s.d.

Data from Fig. 6

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Expected plus 1 s.d. exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the simplified model with axial couplings.

• #### 2D exclusion contour, axial, Expected minus 1 s.d.

Data from Fig. 6

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Expected minus 1 s.d. exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the simplified model with axial couplings.

• #### 2D exclusion contour, vector, Median Expected

Data from Fig. 6

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Median Expected exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the simplified model with vector couplings.

• #### 2D exclusion contour, vector, Observed

Data from Fig. 6

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Observed exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the simplified model with vector couplings.

• #### 2D exclusion contour, vector, Expected plus 1 s.d.

Data from Fig. 6

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Expected plus 1 s.d. exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the simplified model with vector couplings.

• #### 2D exclusion contour, vector, Expected minus 1 s.d.

Data from Fig. 6

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Expected minus 1 s.d. exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the simplified model with vector couplings.

• #### Coupling limits on $g_{\chi}$, axial mediator

Data from Fig. 7, as well as supplementary material

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Upper limits on the coupling $g_{\chi}$ in the simplified model with a axial mediator.

• #### Coupling limits on $g_{q}$, axial mediator

Data from Fig. 7, as well as supplementary material

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Upper limits on the coupling $g_{q}$ in the simplified model with a axial mediator.

• #### Coupling limits on $g_{\chi}$, vector mediator

Data from Fig. 7, as well as supplementary material

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Upper limits on the coupling $g_{\chi}$ in the simplified model with a vector mediator.

• #### Coupling limits on $g_{q}$, vector mediator

Data from Fig. 7, as well as supplementary material

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Upper limits on the coupling $g_{q}$ in the simplified model with a vector mediator.

• #### Signal strength limits, scalar mediator

Data from Fig. 8

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Exclusion limits on the signal strength in the simplified model with scalar couplings.

• #### Signal strength limits, pseudoscalar mediator

Data from Fig. 8

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Exclusion limits on the signal strength in the simplified model with pseudoscalar couplings.

• #### ADD $M_{D}$ limits

Data from Fig. 10

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Exclusion limits on the fundamental Planck scale $M_{D}$ as a function of the number of extra dimensions $d$.

• #### 2D exclusion contour, fermion portal, Median Expected

Data from Fig. 9

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Median Expected exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the fermion portal model.

• #### 2D exclusion contour, fermion portal, Observed

Data from Fig. 9

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Observed exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the fermion portal model.

• #### 2D exclusion contour, fermion portal, Expected plus 1 s.d.

Data from Fig. 9

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Expected plus 1 s.d. exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the fermion portal model.

• #### 2D exclusion contour, fermion portal, Expected minus 1 s.d.

Data from Fig. 9

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Expected minus 1 s.d. exclusion contour in the $m_{med}$-$m_{\chi}$ plane in the fermion portal model.

• #### DeepAK8 tagging efficiencies

Supplementary material.

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Tagging efficiency for AK8 jets. The efficiency includes the effect of the machine-learning based DeepAK8 tagger, as well as the...