Constraining the Active-to-Heavy-Neutrino transitional magnetic moments associated with the $Z^{\prime }$ interactions at FASER$\nu$

Abstract

We investigate the effects of the transitional magnetic dipole moment of the active-to-heavy-neutrino associated with a new neutral gauge boson $Z^{\prime }$ on neutrino-nucleon scattering at the ForwArd Search ExpeRiment-$\nu$ (FASER$\nu$). We consider the neutral-current neutrino-nucleon scattering ($\nu A\to NA$) as the production mechanism of the heavy neutrino $N$ at FASER$\nu$ and estimate the sensitivity reach on the magnetic moment coupling ${\mu }_{{\nu }_{\alpha }}$ for a range of heavy neutrino mass ($1\mathrm{GeV}<M_N<70\mathrm{GeV}$). In this study, we consider three benchmark models, in which the heavy neutrino is coupled to $L_e$, $L_{\mu }$ or $L_{\tau }$ doublet, respectively.

Comments: 12 figures