The Belle II silicon vertex detector: Assembly and initial results

Abstract The “chip-on-sensor” concept of this detectorminimizes the distance of the signal propagation from the double-sided silicon detectorstrips to the readout chips and thus reduces noise from strip capacitance. One half of the detectoris built, the second half is being assembled at the time of writing. Prototypes have been tested in several test beams as well as in the so-called Phase 2 setup inside the detectorstructure. First results from a commissioning run of the Belle-II prototype SVD detectorare presented. The measured signal-to-noise and timing performanceare found to be according to design specifications.