Search

The subject of this talk is the possibility of using for the trigger the change in secondary track multiplicity which is due to a multi-charged decay of one of the particles produced in the interaction. The process under study is the associated production of two charmed states one of which has a decay length of the order of 1 cm, the other decay length being shorter. The target used is a silicon detector telescope, made of 10 layers 300 μ thick put at a distance of 100 μ.

In this paper the use of Silicon detectors as live targets in high energy physics is discussed. The development of this technique is being carried on by the group of Milan since 1968 in three different field of physics: coherent production on nuclei, short lifetime measurements, trigger on charm particles.