8th International Workshop on Semiconductor Pixel Detectors for Particles and Imaging.

4D pixel detectors

Not scheduled

20m

Sestri Levante

review talk

Speaker

Nicolo' Cartiglia (TO)

Description

In this contribution we will review the progresses toward the construction of a tracking system able to measure the passage of charged particles with a combined precision r.m.s. of ∼ 10 ps and ∼ 10 μm, either using a single type of sensor, able to concurrently measure position and time, or a combination of position and time sensors.

Summary

The inclusion of timing information in the structure of a recorded event has the capability of changing the way we design experiments, as this added dimension dramatically improves the reconstruction process. Depending on the type of sensors that will be used, timing information can be available at different stages in the reconstruction of an event, for example (i) at tracking reconstruction, if timing is associated to each point or (ii) during the event reconstruction, if timing information is associated to each track. In the first case, the 4th dimension brings
 a simplification already in the reconstruction algorithm as only time-compatible hits are used in the pattern recognition phase, however the electronics is very demanding as it needs to be able to accurately measure timing in each pixel. The second case is simpler as it requires the implementation of a dedicated timing layer, either inside or outside the main silicon tracker volume, to assign the timing information to each crossing track without changing the vast majority of the tracker hardware. The timing information can then be used to improve Level 1 trigger decisions, as it can be obtained faster than tracking reconstruction, and to separate events with overlapping vertices.
We will present the research and development progresses in terms of sensors and read-out electronics, showing the current best limits and reviewing the possible technological choices currently developed