Development of the Global Track Trigger for the CMS Phase-2 Upgrade

During the Phase 2 Upgrade of the Compact Muon Solenoid (CMS), many detector electronics innovations will be implemented to prepare for the unparalleled data rates of the High-Luminosity Large Hadron Collider (HL-LHC). A key aspect of this upgrade is including charged particle tracking information in the Level-1 (L1) trigger, which will reduce the effects of increased pileup from the HL-LHC, as well as enable triggering on previously inaccessible signatures. One of these signatures is a W boson decaying to three charged pions; as a fully visible decay of the W, studying this decay process could yield further insights into the properties of the W, such as its mass. In this talk, we will discuss a new algorithm that identifies candidates from this W→3π decay, implemented in both firmware and a bit-accurate emulation software. This firmware algorithm will be implemented into the Global Track Trigger (GTT), a novel framework that processes tracking information in real-time to make triggering decisions.