Abstract (data abstract)

The first search exploiting the vector boson fusion process to probe heavy Majorana neutrinos and the Weinberg operator at the LHC is presented. The search is performed in the same-sign dimuon final state using a proton-proton collision data set recorded at $\sqrt{s}=13$ TeV, collected with the CMS detector and corresponding to a total integrated luminosity of 138 $\text{fb}^{-1}$. The results are found to agree with the predictions of the standard model. For heavy Majorana neutrinos, constraints on the squared mixing element between the muon and the heavy neutrino are derived in the heavy neutrino mass range $50$ GeV -- $25$ TeV; for masses above 650\GeV these are the most stringent constraints from searches at the LHC to date. A first test of the Weinberg operator at colliders provides an observed upper limit at 95\% confidence level on the effective $\mu\mu$ Majorana neutrino mass is $10.8$ GeV.

Figure 2

Data from Figure 2.

10.17182/hepdata.130825.v1/t1

Distribution of $H_T / p_{T}^{\mu_{1}}$ for signals, backgrounds and data. The bins are used in the simultaneous fit. The bins...
Figure 3

Data from Figure 3

10.17182/hepdata.130825.v1/t2

Exclusion limits on the squared mixing element between the muon and the heavy Majorana neutrino, as a function of the...
Supplementary Figure 1

Data from Supplementary Figure 1

10.17182/hepdata.130825.v1/t3

Distribution of $H_T / p_{T}^{\mu_{1}}$ for signals, backgrounds and data. The bins are used in the simultaneous fit. The bins...
Addtional Figure 2

Data from Supplementary Figure 2

10.17182/hepdata.130825.v1/t4

Covariance between the total rate of background contributions in each of the high-$\Delta\phi_{ll}$ signal region bins for the heavy Majorana...
Addtional Figure 3

Data from Supplementary Figure 3

10.17182/hepdata.130825.v1/t5

Covariance between the total rate of background contributions in each of the low-$p_{T}^{miss}$ signal region bins for the Weinberg operator...
Addtional Table 3

Data from Supplementary Table 3

10.17182/hepdata.130825.v1/t6

Cutflow efficiencies of three representative heavy Majorana neutrino processes with different Majorana neutrino masses and the Weinberg operator process in...
Addtional Table 4

Data from Supplementary Table 4

10.17182/hepdata.130825.v1/t7

Cutflow efficiencies of three representative heavy Majorana neutrino processes with different Majorana neutrino masses and the Weinberg operator process in...
Addtional Table 5

Data from Supplementary Table 5

10.17182/hepdata.130825.v1/t8

Cutflow efficiencies of three representative heavy Majorana neutrino processes with different Majorana neutrino masses and the Weinberg operator process in...
Additional Table 1

Data from Supplementary Table I

10.17182/hepdata.130825.v1/t9

The yields of the heavy Majorana neutrino processes with different Majorana neutrino masses in each bin of the high-$\Delta\phi_{ll}$ signal...
Additional Table 2

Data from Supplementary Table II

10.17182/hepdata.130825.v1/t10

The yields of the Weinberg operator process in each bin of the low-$p_{T}^{miss}$ signal region for 2016–2018.

Figure 2

Figure 3

Supplementary Figure 1

Addtional Figure 2

Addtional Figure 3

Addtional Table 3

Addtional Table 4

Addtional Table 5

Additional Table 1

Additional Table 2

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