# TeV Scale Seesaw and a flavorful Z' at the LHC

## TL;DR

This paper explores how a TeV-scale Z' gauge boson, arising from an anomaly-free U(1)_{nu} symmetry, can be produced and distinguished at the LHC, providing insights into neutrino masses and flavor structure.

## Contribution

It introduces a model with a flavorful Z' gauge boson linked to neutrino mass generation, and analyzes its discovery potential and flavor discrimination at the LHC.

## Key findings

- LHC can discover Z' up to 4.5 TeV with 100 fb^{-1}
- Distinguishing dielectron and dimuon channels requires high luminosity
- Forward-backward asymmetry helps differentiate lepton channels

## Abstract

Small neutrino masses and their large mixing angles can be generated at the TeV scale by augmenting the Standard Model with an additional generation dependent, anomaly-free U(1)_{nu} symmetry, in the presence of three right-handed neutrinos. The Z' gauge boson associated with the breaking of the U(1)_{nu} symmetry can be produced at the LHC. The flavorful nature of the Z' can be established by measuring its non-universal couplings to the charged leptons as determined by the lepton's U(1)_{nu} charges, which also govern the neutrino flavor structure. While the LHC has the potential of discovering the Z' up to M_{Z'} = 4.5 TeV with 100 fb^(-1) data at the center of mass energy sqrt{s} = 14 TeV, to establish the flavorful nature of the Z' requires much higher integrated luminosity. For our bench mark parameters that are consistent with neutrino oscillation data, at sqrt{s} = 14 TeV, a 5 sigma distinction between the dielectron and dimuon channels for M_{Z'} = 3 TeV requires 500 fb^(-1) of data. We find that the forward backward asymmetry distributions can also be useful in distinguishing the dielectron and dimuon channels in the low invariant mass and transverse momentum regions.