Overview of the BTeV Muon System
The muon system plays an important role in the physics goals of BTeV. It has two primary functions:
The triggering and identification functions of the system represent a significant technical challenge given the size constraints of the experimental hall and the uncertainties in backgrounds from the accelerator, interaction point, and hadronic showers in the EM calorimeter.
We have selected a toroidal magnet design combined with fine-grained tracking elements. This design permits a "stand-alone" first-level trigger based solely on information from the muon detector. In addition, improved background rejection (at higher trigger levels and offline) is possible by comparing this stand-alone measurement with momentum and tracking information from the rest of the spectrometer. The system design has been chosen to reduce and uniformly distribute occupancies and to minimize confusion in pattern recognition. To provide a viable trigger, the system must obtain a rejection rate at Level 1 of a few hundred. The goal for muon misidentification is a tenth of a percent.
(A detector module)
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