First beam test results from a monolithic silicon pixel detector

Abstract We have tested a telescope of four monolithic pixel detectors in a 300–600 GeV muon beam at Fermilab. The detectors were 300 μm thick and had 30 × 10 pixels of 34 by 125 μm2. The signal to single channel noise was 55 to 1 in the beam test. The position resolution in the 34 μm direction had a σ = 2.2 μm. In an efficiency test the detectors did not miss any of 2665 minimum ionizing particle hits.