  We investigate long-lived particles (LLPs) produced in pair from neutral
currents and decaying into a displaced electron plus two jets at the LHC,
utilizing the proposed minimum ionizing particle timing detector at CMS. We
study two benchmark models: the R-parity-violating supersymmetry with the
lightest neutralinos being the lightest supersymmetric particle and two
different $U(1)$ extensions of the standard model with heavy neutral leptons
(HNLs). The light neutralinos are produced from the standard model $Z$-boson
decays via small Higgsino components, and the HNLs arise from decays of a heavy
gauge boson, $Z'$. By simulating the signal processes at the HL-LHC with the
center-of-mass energy $\sqrt{s}=$ 14 TeV and integrated luminosity of 3
ab$^{-1}$, our analyses indicate that the search strategy based on a timing
trigger and the final state kinematics has the potential to probe the parameter
space that is complementary to other traditional LLP search strategies such as
those based on the displaced vertex.
