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| CMS-PAS-EXO-20-006 | ||
| Search for Z' bosons decaying to pairs of heavy Majorana neutrinos in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| March 2022 | ||
| Abstract: A search for pair production of heavy Majorana neutrinos (${\mathrm{N}}_{\ell}$) from the decays of Z' bosons is performed using the CMS detector at the LHC. The data were collected in proton-proton collisions at a center-of-mass energy of $\sqrt{s} = $ 13 TeV, with an integrated luminosity of 138 fb$^{-1}$. The signature of this search is two same-flavor leptons (e or $\mu$) and at least two jets. We do not observe any significant excess of events beyond the expected background. Upper limits at the 95% CL are set on the cross section times branching ratio for the pair production of ${\mathrm{N}}_{\ell}$ as a function of ${\mathrm{N}}_{\ell}$ and Z' boson masses (${m}_{{\mathrm{N}}_{\ell}}$ and ${m}_\mathrm{{Z}^{\prime}}$, respectively) for ${m}_\mathrm{{Z}^{\prime}}$ from 400 GeV to 4.4 TeV and ${m}_{{\mathrm{N}}_{\ell}}$ from 100 GeV to $\frac{{m}_\mathrm{{Z}^{\prime}}}{2}$. In the theoretical framework of a left-right symmetric model, exclusion bounds on the ${m}_{{\mathrm{N}}_{\ell}}$-${m}_\mathrm{{Z}^{\prime}}$ plane are presented in both the electron and muon channels. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Pair production of ${{\mathrm {N}}_{\ell}}$ via Z' boson is shown in the diagram, where $\ell $ = e and $\mu $. The ${{\mathrm {N}}_{\ell}}$ decays into a lepton and two quarks. ${{\mathrm {W}}_{\text {R}}^{\pm}}$ is offshell since we assume ${{\mathrm {W}}_{\text {R}}^{\pm}}$ is heavier than ${{\mathrm {N}}_{\ell}}$. Both opposite- and same-sign dileptons from decays of heavy neutrino pair are allowed due to the Majorana nature. |
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Figure 2:
The reconstructed mass of the Z' boson in CR1, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Pre(Post)fit results are shown left (right). |
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Figure 2-a:
The reconstructed mass of the Z' boson in CR1, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Pre(Post)fit results are shown left (right). |
png pdf |
Figure 2-b:
The reconstructed mass of the Z' boson in CR1, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Pre(Post)fit results are shown left (right). |
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Figure 2-c:
The reconstructed mass of the Z' boson in CR1, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Pre(Post)fit results are shown left (right). |
png pdf |
Figure 2-d:
The reconstructed mass of the Z' boson in CR1, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Pre(Post)fit results are shown left (right). |
png pdf |
Figure 2-e:
The reconstructed mass of the Z' boson in CR1, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Pre(Post)fit results are shown left (right). |
png pdf |
Figure 2-f:
The reconstructed mass of the Z' boson in CR1, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Pre(Post)fit results are shown left (right). |
png pdf |
Figure 3:
The reconstructed mass of the Z' boson in CR2, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Dielectron (Dimuon) channel results are shown left (right). |
png pdf |
Figure 3-a:
The reconstructed mass of the Z' boson in CR2, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Dielectron (Dimuon) channel results are shown left (right). |
png pdf |
Figure 3-b:
The reconstructed mass of the Z' boson in CR2, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Dielectron (Dimuon) channel results are shown left (right). |
png pdf |
Figure 3-c:
The reconstructed mass of the Z' boson in CR2, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Dielectron (Dimuon) channel results are shown left (right). |
png pdf |
Figure 3-d:
The reconstructed mass of the Z' boson in CR2, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Dielectron (Dimuon) channel results are shown left (right). |
png pdf |
Figure 3-e:
The reconstructed mass of the Z' boson in CR2, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Dielectron (Dimuon) channel results are shown left (right). |
png pdf |
Figure 3-f:
The reconstructed mass of the Z' boson in CR2, which are flavor sidebands of SR1 (top), SR2 (middle), and SR3 (bottom). Dielectron (Dimuon) channel results are shown left (right). |
png pdf |
Figure 4:
Distributions of ${{M}_\mathrm {{Z}^{\prime}}^{\text {Reco}}}$ at SR1 (top), SR2 (middle) and SR3 (bottom) are presented. Left (right) plot is from dielectron (dimuon) channel. Signal samples with $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 200 GeV) and $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 1200 GeV) are plotted together with best-fit shapes. |
png pdf |
Figure 4-a:
Distributions of ${{M}_\mathrm {{Z}^{\prime}}^{\text {Reco}}}$ at SR1 (top), SR2 (middle) and SR3 (bottom) are presented. Left (right) plot is from dielectron (dimuon) channel. Signal samples with $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 200 GeV) and $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 1200 GeV) are plotted together with best-fit shapes. |
png pdf |
Figure 4-b:
Distributions of ${{M}_\mathrm {{Z}^{\prime}}^{\text {Reco}}}$ at SR1 (top), SR2 (middle) and SR3 (bottom) are presented. Left (right) plot is from dielectron (dimuon) channel. Signal samples with $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 200 GeV) and $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 1200 GeV) are plotted together with best-fit shapes. |
png pdf |
Figure 4-c:
Distributions of ${{M}_\mathrm {{Z}^{\prime}}^{\text {Reco}}}$ at SR1 (top), SR2 (middle) and SR3 (bottom) are presented. Left (right) plot is from dielectron (dimuon) channel. Signal samples with $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 200 GeV) and $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 1200 GeV) are plotted together with best-fit shapes. |
png pdf |
Figure 4-d:
Distributions of ${{M}_\mathrm {{Z}^{\prime}}^{\text {Reco}}}$ at SR1 (top), SR2 (middle) and SR3 (bottom) are presented. Left (right) plot is from dielectron (dimuon) channel. Signal samples with $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 200 GeV) and $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 1200 GeV) are plotted together with best-fit shapes. |
png pdf |
Figure 4-e:
Distributions of ${{M}_\mathrm {{Z}^{\prime}}^{\text {Reco}}}$ at SR1 (top), SR2 (middle) and SR3 (bottom) are presented. Left (right) plot is from dielectron (dimuon) channel. Signal samples with $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 200 GeV) and $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 1200 GeV) are plotted together with best-fit shapes. |
png pdf |
Figure 4-f:
Distributions of ${{M}_\mathrm {{Z}^{\prime}}^{\text {Reco}}}$ at SR1 (top), SR2 (middle) and SR3 (bottom) are presented. Left (right) plot is from dielectron (dimuon) channel. Signal samples with $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 200 GeV) and $({{m}_\mathrm {{Z}^{\prime}}}, {{m}_{{{\mathrm {N}}_{\ell}}}}) = $ (4000 GeV, 1200 GeV) are plotted together with best-fit shapes. |
png pdf |
Figure 5:
The observed and expected limits on the cross section times branching ratio of Z' is shown for the case of $ {{m}_{{{\mathrm {N}}_{\ell}}}} = {{m}_\mathrm {{Z}^{\prime}}}$/4 (top) and $ {{m}_{{{\mathrm {N}}_{\ell}}}} = $ 100 GeV (bottom) at dielectron (left) and dimuon (right) channels. The green and yellow bands indicate the 68% and 95% CL bands for the expected limit. |
png pdf |
Figure 5-a:
The observed and expected limits on the cross section times branching ratio of Z' is shown for the case of $ {{m}_{{{\mathrm {N}}_{\ell}}}} = {{m}_\mathrm {{Z}^{\prime}}}$/4 (top) and $ {{m}_{{{\mathrm {N}}_{\ell}}}} = $ 100 GeV (bottom) at dielectron (left) and dimuon (right) channels. The green and yellow bands indicate the 68% and 95% CL bands for the expected limit. |
png pdf |
Figure 5-b:
The observed and expected limits on the cross section times branching ratio of Z' is shown for the case of $ {{m}_{{{\mathrm {N}}_{\ell}}}} = {{m}_\mathrm {{Z}^{\prime}}}$/4 (top) and $ {{m}_{{{\mathrm {N}}_{\ell}}}} = $ 100 GeV (bottom) at dielectron (left) and dimuon (right) channels. The green and yellow bands indicate the 68% and 95% CL bands for the expected limit. |
png pdf |
Figure 5-c:
The observed and expected limits on the cross section times branching ratio of Z' is shown for the case of $ {{m}_{{{\mathrm {N}}_{\ell}}}} = {{m}_\mathrm {{Z}^{\prime}}}$/4 (top) and $ {{m}_{{{\mathrm {N}}_{\ell}}}} = $ 100 GeV (bottom) at dielectron (left) and dimuon (right) channels. The green and yellow bands indicate the 68% and 95% CL bands for the expected limit. |
png pdf |
Figure 5-d:
The observed and expected limits on the cross section times branching ratio of Z' is shown for the case of $ {{m}_{{{\mathrm {N}}_{\ell}}}} = {{m}_\mathrm {{Z}^{\prime}}}$/4 (top) and $ {{m}_{{{\mathrm {N}}_{\ell}}}} = $ 100 GeV (bottom) at dielectron (left) and dimuon (right) channels. The green and yellow bands indicate the 68% and 95% CL bands for the expected limit. |
png pdf |
Figure 6:
Observed and expected exclusion regions at 95% CL in the 2D phase space of ${{m}_\mathrm {{Z}^{\prime}}} $ VS ${{\mathrm {N}}_{\ell}}$ at dielectron (left) and dimuon (right) channels. |
png pdf |
Figure 6-a:
Observed and expected exclusion regions at 95% CL in the 2D phase space of ${{m}_\mathrm {{Z}^{\prime}}} $ VS ${{\mathrm {N}}_{\ell}}$ at dielectron (left) and dimuon (right) channels. |
png pdf |
Figure 6-b:
Observed and expected exclusion regions at 95% CL in the 2D phase space of ${{m}_\mathrm {{Z}^{\prime}}} $ VS ${{\mathrm {N}}_{\ell}}$ at dielectron (left) and dimuon (right) channels. |
| Tables | |
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Table 1:
Events selections based on multiplicities of objects (AK8 jets, tight leptons, and AK4 jets). |
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Table 2:
The list of systematic uncertainties and their impacts on the total number of events in signal regions. |
| Summary |
| A search for the pair production of heavy Majorana neutrinos via the decay of a Z' boson, in a final state with two same-flavor leptons and at least two reconstructed jets has been performed in proton-proton collisions at a center-of-mass energy of 13 TeV, using data corresponding to an integrated luminosity 138 fb$^{-1}$. We do not observe any significant excess above the expected background. We set upper limits on the signal cross section times branching ratio in the context of an LRSM scenario [38]. Exclusion regions in the dielectron and dimuon channels are set with 95% CL. These are the first results for the search of this process using the Run 2 data set of the LHC, and are the most restrictive direct limits in the phase space of ${{m}_\mathrm{{Z}^{\prime}}}$ vs ${{m}_{{{\mathrm{N}}_{\ell}} }}$ to date. |
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