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The Inner Tracking System (ITS)

A vertex detector or inner tracking system :

The short-living heavy particles cover a very small distance before decaying. This system aims at identifying these phenomena of disintegration by measuring the location where they occur with a precision of a tenth of millimetre

The Inner Tracking System (ITS) consists of six cylindrical layers of silicon detectors, mounted on the support structure shown here.
The layers surround the collision point and measure the properties of the emerging particles, pin-pointing their positions to a fraction of a millimetre.
The ITS will recognise particles containing heavy quarks by identifying the points at which they decay.