Speaker
Description
The global Feature Extractor (gFEX) is a level one hardware trigger system that is a component of the Phase I ATLAS trigger upgrades. The goal of the gFEX trigger design and implementation is to target global quantities like large radius jets, specifically those large radius jets with interesting substructure. The previous systems are not able to access a large enough area from the calorimeter to effectively calculate and trigger on large radius jets in the available latency. With the gFEX system, this problem is solved by reading in the energy of the entire calorimeter with one single board. These types of jets with interesting substructure are often generated from boosted objects like the Higgs, W, and Z bosons, making the gFEX an invaluable tool for Runs 3 and 4 at the LHC. We will discuss the gFEX algorithms and their expected impact on performance as well as the benefits generated from the novel use of a System on Chip in the real time data path, which introduces the possibility of additional analysis at high rate.
