CMS-PAS-EXO-20-006

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.
Links: CDS record (PDF) ; CADI line (restricted) ; These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here.

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