Experimental Sensitivity for Majorana Neutrinos Produced via a Z Boson at Hadron Colliders

Abstract

We present experimental sensitivity for the production of a fourth-generation Majorana neutrino ($N$) via an s-channel $Z$ boson $Z\to NN\to W\ell W\ell$ at hadron colliders. This channel has not been studied for the Tevatron dataset with $\int \mathcal{L}=5$ fb${}^{-1}$, where we find that a single experiment could significantly extend current 95% C.L. mass lower limits, to $m_N>175$ GeV$/c^2$, or report $3\sigma$ evidence for the $N$ if $m_N<150$ GeV$/c^2$. With 5 fb${}^{-1}$, a single LHC experiment at $\sqrt{s}=10$ TeV could expect t o set a 95% C.L. mass lower limits of $m_N>300$ GeV$/c^2$, or report 3$\sigma$ evidence for the $N$ if $m_N<225$ GeV$/c^2$.

4 pages, for PRL

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• Neutrino Masses and a Fourth Generation of Fermions
• Tevatron Discovery Potential for Fourth Generation Neutrinos: Dirac, Majorana and Everything in Between