Abstract
A certain class of new physics models includes long-lived particles which are singlet under the Standard Model (SM) gauge group.A displaced vertex is a spectacular signature to probe such particles productions at the high energy colliders, with a negligible SM background. In the context of the minimal gauged $B-L$ extended SM, we consider a pair creation of Majorana right-handed neutrinos (RHNs) at the high energy colliders through the production of the SM and the $B-L$ Higgs bosons and their subsequent decays into RHNs. With parameters reproducing the neutrino oscillation data, we show that the RHNs are long-lived and their displaced vertex signature can be observed at the next generation displaced vertex search experiments, such as the HL-LHC, the MATHUSLA, the LHeC, and the FCC-eh.We find that the lifetime of the RHNs is controlled by the lightest light neutrino mass, which leads to a correlation between the displaced vertex search and the search limit of the future neutrinoless double beta-decay experiments.
Highlights
The last missing piece of the standard model (SM) is supplemented with the discovery of the Higgs boson at the Large Hadron Collider (LHC) in 2012 [1,2], which itself is not that surprising given the tremendous success of the SM to explain observed elementary particle phenomena
We have shown the relation between Y and sin θ to achieve the best reach cross section at the HL-LHC/MATHUSLA, assuming the heavy neutrino lifetime to be the best point for each experiment
It is quite possible that new particles in new physics beyond the SM are completely singlet under the SM gauge group
Summary
The last missing piece of the standard model (SM) is supplemented with the discovery of the Higgs boson at the Large Hadron Collider (LHC) in 2012 [1,2], which itself is not that surprising given the tremendous success of the SM to explain observed elementary particle phenomena. The tiny neutrinos masses are automatically generated through the so-called type-I seesaw mechanism [31,32,33,34,35,36] after the electro-weak symmetry breaking In this model context, we investigate the displaced vertex signature of the Majorana RHNs at the future high energy colliders through the production of the SM and the B − L Higgs bosons and their subsequent decays into RHNs.. [57], the authors have studied the prospect of a dedicated displaced vertex search at the future electron-proton colliders, such as the LHeC and the FCCeh In their analysis, they consider a pair production of a long-lived particle “X” created from the rare decay of the SM Higgs boson.
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