Event-Filter Muon Isolation

Abstract

Muons can be produced in a range of physics processes. Typically those of most interest are muons that originate in the decay of a heavy boson, for example $W\rightarrow \mu \nu$. Such muons are usually isolated from hadronic activity, in contrast to muons that originate in the decays of hadrons, which are often found within jets. To give us more confidence that muons collected have come from heavy boson decays, as well as reducing the rate of collecting non-isolated and potentially “fake” muons, isolation variables are defined that quantify the amount of hadronic activity surrounding the muon. This chapter describes work performed on commissioning a new isolated muon trigger that uses track information available at the Event Filter (EF). After commissioning, the isolated trigger was used as one of the primary triggers for the 2012 data-taking period.