Design and Implementation of the New D0 Level-1 Calorimeter Trigger

TL;DR

This paper details the design and implementation of a new level-1 calorimeter trigger system for the D0 detector, enhancing event selection efficiency and background rejection during Run IIb at Fermilab.

Contribution

It introduces a novel architecture and algorithms for the level-1 calorimeter trigger, improving performance and providing insights for future LHC trigger systems.

Findings

High efficiency for interesting events maintained

Significant increase in background rejection achieved

System demonstrated reliable performance during Run IIb

Abstract

Increasing luminosity at the Fermilab Tevatron collider has led the D0 collaboration to make improvements to its detector beyond those already in place for Run IIa, which began in March 2001. One of the cornerstones of this Run IIb upgrade is a completely redesigned level-1 calorimeter trigger system. The new system employs novel architecture and algorithms to retain high efficiency for interesting events while substantially increasing rejection of background. We describe the design and implementation of the new level-1 calorimeter trigger hardware and discuss its performance during Run IIb data taking. In addition to strengthening the physics capabilities of D0, this trigger system will provide valuable insight into the operation of analogous devices to be used at LHC experiments.