  Several compelling beyond the Standard Model scenarios predict signals that
result in unconventional charged particle trajectories. Signatures for which
unusual tracks are the most conspicuous feature pose significant challenges for
experiments at the Large Hadron Collider (LHC), particularly for the trigger.
This article presents a study of track-based triggers for a representative set
of long-lived and unconventional signatures at the upcoming High Luminosity
LHC. Scenarios studied include large multiplicities of low momentum tracks
produced in a soft-unclustered-energy-pattern model, displaced leptons and
anomalous prompt tracks predicted in a Supersymmetry model with long-lived
staus, and displaced hadrons predicted in a Higgs portal scenario with
long-lived scalars. Trigger efficiency is measured as a function of the
baseline parameters of a track trigger, including transverse momentum and
impact parameter. Recommendations for future hardware-based track triggers are
presented.
