Compact Muon Solenoid
LHC, CERN
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| CMS-PAS-EXO-20-011 | ||
| Search for a heavy composite Majorana neutrino | ||
| CMS Collaboration | ||
| March 2022 | ||
| Abstract: This note describes a search for a heavy Majorana neutrino $\mathrm{N}_{\ell}$ in the final state with two same-flavor leptons $\ell$ (electrons or muons) and two quarks. In the model considered, $\mathrm{N}_{\ell}$ arises from a composite scenario. The analysis is performed using a sample of proton-proton collisions at $\sqrt{s}= $ 13 TeV recorded by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 138 fb$^{-1}$. The observed data are in agreement with the standard model prediction. For a process in which $\mathrm{N}_{\ell}$ is produced in association with a lepton, followed by the decay of $\mathrm{N}_{\ell}$ to a same-flavor lepton and a quark pair, an upper limit at 95% confidence level on the cross section times branching fraction is obtained as a function of the $\mathrm{N}_{\ell}$ mass $m_{\mathrm{N}_{\ell}}$. In this model, the data exclude $\mathrm{N}_{\mathrm{e}}$ ($\mathrm{N}_{\mu}$) for $m_{\mathrm{N}_{\ell}}$ below 5.50 (5.70) TeV in the limit where the compositeness scale $\Lambda$ is equal to $m_{\mathrm{N}_{\ell}}$, and below 5.10 (5.50) TeV with the more restrictive requirement that the unitarity bound is satisfied over the full phase space of parton motion within the proton. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Accepted by PLB. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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