Constraining the transitional magnetic dipole moment interaction between active and heavy neutrinos with the Z' at FASER ν

We investigate the effects of the transitional magnetic dipole type interactions of the active-to-heavy-neutrino associated with a new neutral gauge boson Z' on neutrino-nucleon scattering at the ForwArd Search ExpeRiment- ν (FASER ν ). We consider the neutral-current neutrino-nucleon scattering ( ν A→ N A' , where A' denotes the disintegrated nuclei) as the production mechanism of the heavy neutrino N at FASER ν and estimate the sensitivity reach on the magnetic-type dipole coupling ω _ν _α for a range of heavy neutrino mass ( 1 GeV< M_N < 70 GeV ). In this study, we consider three benchmark models, in which the heavy neutrino is coupled to L_e , L_μ or L_τ doublet, respectively.