Charged-current non-standard neutrino interactions at the LHC and HL-LHC

Abstract

A series of new physics scenarios predict the existence of the extra charged gauge boson $W'$, which can induce charged-current (CC) non-standard neutrino interactions (NSIs). The theoretical constraints on the simplified $W'$ model and further on the CC NSI parameters $\widetilde{\epsilon}^{ qq'Y}_{\alpha\beta}$ from partial wave unitarity and $W'$ decays are considered. The sensitivity of the process $p p \rightarrow W'\rightarrow \ell\nu $ to the $W'$ model at the LHC and high-luminosity~(HL) LHC experiments is investigated by estimating the expected constraints on $\widetilde{\epsilon}^{qq'Y}_{\alpha\beta}$ ($\alpha = \beta = e $ or $\mu$) using a Monte-Carlo~(MC) simulation. We find that the interference effect plays an important role, and the LHC can strongly constrain $\widetilde{\epsilon}^{qq'L}_{\alpha\beta}$. Compared with those at the $13 \;{\rm TeV}$ LHC with $\mathcal{L}=139\;{\rm fb}^{-1}$, the expected constraints at the $14 \;{\rm TeV}$ LHC with $\mathcal{L}=3\;{\rm ab}^{-1}$ can be strengthened to approximately one order of magnitude.