Abstract
We explore the discovery prospect of a very heavy neutrino at the proposed $e^+e^-$ collider for two different c.m.energies $\sqrt{s}=1.4$ TeV and 3 TeV. We consider production of heavy neutrino via $s$ and $t$-channel processes, and its subsequent prompt decays leading to semi-leptonic final states, along with significant missing energy. For our choice of masses, the gauge boson produced from heavy neutrino decay is highly boosted, leading to a fat-jet. We carry out a detail signal and background analysis for $e^{\pm}+j_{\rm{fat}}+\cancel{E}_{T}$ final state using both cut based and multivariate techniques. We show that a heavy neutrino of mass $600-2700$ GeV and active-sterile mixing $|V_{eN}|^2 \sim 10^{-5}$ can be probed with $5\sigma$ significance at $e^{+}e^{-}$ collider after collecting $\mathcal{L}=500$ $\rm{fb}^{-1}$ of data. We find the sensitivity reach at $e^{+}e^{-}$ collider is order of magnitude enhanced as compared to LHC.
Highlights
The experimental observation of neutrino oscillations in different oscillation experiments has conclusively given evidence that neutrinos have tiny eV masses and nonzero mixings [1]
We show that a heavy neutrino of mass 600–2700 GeV and active-sterile mixing jVeNj2 ∼ 10−5 can be probed with 5σ significance at an eþe− collider after collecting L 1⁄4 500 fb−1 of data
We explore the discovery prospect of a heavy neutrino with intermediate and large mass ranges MN 1⁄4 600–1200 and 1300–2700 GeV at ptheffiffi proposed eþe− collider for two different c.m. energies, s 1⁄4 1.4 and 3 TeV, respectively
Summary
The experimental observation of neutrino oscillations in different oscillation experiments has conclusively given evidence that neutrinos have tiny eV masses and nonzero mixings [1]. Depending on the mass of the gauge singlet neutrinos and their mixings with the active neutrino states, seesaw can be tested at colliders [28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47], as well as in other noncollider experiments, such as neutrinoless double beta decay [48,49,50,51,52,53,54]; lepton flavor violating processes li → ljγ; μ → 3e; μ → e conversion in nuclei [55,56]; rare-meson decays [57,58,59], etc.
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