Signatures of the quintuplet leptons at the LHC

We investigate the production and detection prospects for the quintuplet heavy leptons at the LHC in the context of a new model which is proposed as a viable and testable solution to the neutrino mass problem. We classify the signals, carry out a full simulation on the signals and the relevant backgrounds at the 14 TeV LHC. After applying suitable kinematic cuts, the background events are substantially suppressed. The signals of the heavy leptons might be detected at the 14 TeV LHC.

Figure 1

The cross sections of the heavy lepton pair or associated productions as a function of the mass $M_{\mathrm{\Sigma }}$ for the c.m. energy $\sqrt{s}=8\mathrm{TeV}$ and 14 TeV.

Figure 2

Normalized $p_T$ distribution of the leading lepton in the $2l^{\pm }{l}^{\mp }2j{\cancel{E}}_T$ signal for $M_{\mathrm{\Sigma }}=300\mathrm{GeV}$ (a) and 500 GeV (b) at the 14 TeV LHC.

Figure 3

Normalized invariant mass distribution of $M(llv)$ and $M(ljj)$ in the $2l^{\pm }{l}^{\mp }2j{\cancel{E}}_T$ signal for $M_{\mathrm{\Sigma }}=300\mathrm{GeV}$ (a),(b) and 500 GeV (c),(d) at the 14 TeV LHC.

Figure 4

The needed luminosity to observe different masses of the heavy leptons via the $2l^{\pm }{l}^{\mp }2j{\cancel{E}}_T$ signal for $3\sigma$ and $5\sigma$ statistical significances at the 14 TeV LHC.

Figure 5

Normalized $p_T$ distribution of the leading lepton in the $2l^{\pm }2l^{\mp }2j$ signal for $M_{\mathrm{\Sigma }}=300\mathrm{GeV}$ (a) and 500 GeV (b) at the 14 TeV LHC.

Figure 6

Normalized invariant mass distribution of $M(lll)$ and $M(ljj)$ in the $2l^{\pm }{l}^{\mp }2j{\cancel{E}}_T$ signal for $M_{\mathrm{\Sigma }}=300\mathrm{GeV}$ (a),(b) and 500 GeV (c),(d) at the 14 TeV LHC.

Figure 7

The needed luminosity to observe different mass quintuplet leptons via the $2l^{\pm }2l^{\mp }2j$ signal for the $3\sigma$ and $5\sigma$ statistical significances at the 14 TeV LHC.

Figure 8

The needed luminosity to observe different mass quintuplet leptons via $3l^{\pm }{l}^{\mp }2j$ (left panel) and $3l^{\pm }2l^{\mp }{\cancel{E}}_T$ (right panel) signals for $3\sigma$ and $5\sigma$ statistical significances at the 14 TeV LHC.