  Triggering long-lived particles at the first stage of the trigger system is
very crucial in LLP searches to ensure that we do not miss them at the very
beginning. The future High Luminosity runs of the Large Hardron Collider will
have increased number of pile-up events per bunch crossing. There will be major
upgrades in hardware, firmware and software sides, like tracking at level-1
(L1) as well as inclusion of the MIP timing detector. The L1 trigger menu will
also be modified to cope with pile-up and maintain the sensitivity to physics
processes. In our study we found that the usual level-1 triggers, mostly meant
for triggering prompt particles, will not be very efficient for LLP searches in
the 140 PU environment of HL-LHC, thus pointing to the need to include
dedicated L1 triggers in the menu for LLPs. We consider the decay of the LLP
into jets and develop dedicated jet triggers using the track information and if
available, the regional timing information at L1 to select LLP events. We show
in our work that these triggers give promising results in identifying LLP
events with moderate trigger rates.
