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arXiv · 1711.09896

Heavy Majorana neutrino pair productions at the LHC in minimal U(1) extended Standard Model

Arindam Das·Nobuchika Okada·Digesh Raut
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Abstract

In our recent paper [1], we explored a prospect of discovering the heavy Majorana right-handed neutrinos (RHNs) at the future LHC in the context of the minimal non-exotic U(1) extended Standard Model (SM), where a pair of RHNs are created via decay of resonantly produced massive U(1) gauge boson ($Z^{\prime}$). We pointed out that this model can yield a significant enhancement of the branching ratio of the $Z^\prime$ boson to a pair of RHNs, which is crucial for discovering the RHNs under the very severe LHC Run-2 constraint from the search for the $Z^\prime$ boson with dilepton final states. In this paper, we perform a general parameter scan to evaluate the maximum production rate of the same-sign dilepton final states (smoking gun signature of Majorana RHNs production) at the LHC, while reproducing the neutrino oscillation data. We also consider the minimal non-exotic U(1) model with an alternative charge assignment. In this case, we find a further enhancement of the branching ratio of the $Z^\prime$ boson to a pair of RHNs compared to the conventional case, which opens up a possibility of discovering the RHNs even before the $Z^\prime$ boson at the future LHC experiment.

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Arindam Das, Nobuchika Okada, Digesh Raut. 2018-08-22. Heavy Majorana neutrino pair productions at the LHC in minimal U(1) extended Standard Model. https://doi.org/10.1140/epjc%2Fs10052-018-6171-8

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