Majorana neutrinos production at LHeC in an effective approach

Abstract

We investigate the possibility of detecting Majorana neutrinos at the Large Hadron-electron Collider (LHeC), an electron-proton collision mode at CERN. We study the $l_j^{+}+3jets$ ($l_j\equiv e,\mu ,\tau$) final states which are, due to leptonic number violation, a clear signature for intermediate Majorana neutrino contributions. Such signals are not possible if the heavy neutrinos have Dirac nature. The interactions between Majorana neutrinos and the Standard Model (SM) particles are obtained from an effective lagrangian approach. We present our results for the total cross section as a function of the neutrino mass, the effective couplings and the new physics scale. We also show the discovery region as a function of the Majorana neutrino mass and the effective couplings. Our results show that the LHeC may be able to discover Majorana neutrinos with masses lower than $700$ GeV and $1300$ GeV for electron beams settings of $E_e=50$ GeV and $E_e=150$ GeV, respectively.

15 pages, 11 pdf figures. arXiv admin note: text overlap with arXiv:1110.0959

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• Search for heavy Majorana neutrinos at electron-proton colliders
• Lepton collider probes for Majorana neutrino effective interactions
• Angular and polarization observables for Majorana-mediated B decays with effective interactions
• Majorana neutrinos with effective interactions in B decays
• Probing light sterile neutrinos in left-right symmetric models with displaced vertices and neutrinoless double beta decay
• Search for heavy Majorana neutrinos in the $\tau$ final state at proton-electron colliders
• Sensitivity prospects for lepton-trijet signals in the $\nu$SMEFT at the LHeC
• Future collider sensitivities to $\nu$SMEFT interactions