CMS Level 1 Calorimeter Trigger Performance Studies

The level 1 calorimeter trigger system for the CMS detector at the LHC collider must provide a deadtimeless, pipelined trigger that implements simple algorithms which satisfy the physics efficiency and data rate requirements. In this note we examine the performance of a conceptual design and that of an alternate algorithm for the electron trigger. The algorithms account for energy sharing between neighboring towers and perform hadronic, and optionally, electromagnetic isolation. Through extensive simulation of the level 1 calorimeter trigger, we have determined the background rates and efficiencies of triggers for electrons, photons and jets.