Abstract
In our recent paper (Das et al. in Phys Rev D 97:115023, 2018) 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 have 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.
Highlights
If the right-handed neutrinos (RHNs) have masses around 1 TeV or smaller, they can be produced at the Large Hadron Collider (LHC)
We have investigated a prospect of discovering the RHNs in type-I seesaw at the LHC, which are pair produced from the decay of a resonantly produced Z boson
Recent simulation studies show that the discovery of the RHNs via Z → N N is promising at the future LHC with, for example, a 300 fb−1 luminosity
Summary
If the RHNs have masses around 1 TeV or smaller, they can be produced at the Large Hadron Collider (LHC). In our recent paper [23], we considered the minimal U(1)X model with the conventional charge assignment and pointed out that the model can yield a significant enhancement of the branching ratio of Z boson to a pair of RHNs. We focused on the same-sign dimuon final state which is a smoking gun signature of Majorana RHNs production at the LHC. Performing general parameter scans, we evaluate the maximum branching ratio into the signal process, N N → ± ±W ∓W ∓, and discuss the prospect of discovering the RHN at the future LHC in the minimal U(1)X model with both the conventional and the alternative charge assignments. The solid horizontal line denotes luminosity value of 300 fb−1 required for the discovery of RHNs at the future LHC with a dimuon and a diboson final states.
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