# Usage of tracking in the CMS Level-1 trigger for the High Luminosity LHC Upgrade

## TL;DR

This paper discusses the integration of tracking information into the CMS Level-1 trigger system for the High Luminosity LHC, aiming to handle increased collision rates and improve trigger efficiency.

## Contribution

It presents the first implementation and examples of using tracking data in the L1 trigger to reduce rates at the HL-LHC.

## Key findings

- Tracking information can effectively reduce trigger rates.
- Upgraded electronics enable higher trigger rates.
- New trigger strategies incorporate tracking data.

## Abstract

At the High Luminosity LHC (HL-LHC), the CMS experiment will face a harsh environment with a high instantaneous luminosity up to 7x10$^{34}$/cm$^2$/s corresponding to an average of 140-200 multiple proton-proton collisions per bunch crossing. The main goal of the CMS Level 1 (L1) trigger upgrade for the HL-LHC is to maintain trigger thresholds that are as low as possible and comparable to those currently in use at the LHC, and to possibly include new triggers that were not feasible at the LHC. This will be achieved by upgrading the detector readout electronics, to allow a much larger L1 trigger rate, and by including, for the first time, tracking information in the L1 trigger. Examples of how this tracking information can be used to reduce the L1 trigger rates are presented.