Abstract

Abstract

Connecting the dots and Workshop on Intelligent trackers / LHCb Upgrade II

The LHCb Collaboration is planning an Upgrade II, a flavour physics experiment for the high luminosity LHC era. This will be installed in LS4 (2030) and targets an instantaneous luminosity of 1 to $2 \times 10^{34$} cm$^{-2}$ s$^{-1}$ so as to collect an integrated luminosity of at least 300fb^{-1}. Modest consolidation of the current experiment will also be introduced in LS3 (2025). The higher luminosity increases the detector occupancy considerably giving a challenging environment for track reconstruction which is done in Real Time in the trigger at the visible crossing rate of 30 MHz. To meet this challenge two major upgrades to the tracking system are forseen. First a “4D” vertex detector is proposed, which exploits both spatial and time information. The addition of timing information is beneficial both in the assignment of hits to tracks but also allows to separate primary vertices using both spatial and time information. The second major change is to replace the inner part of the downstream tracking stations (which utilize fibers) with silicon technology. For this purpose CMOS and HVCMOS technologies are considered. The new 'Mighty' Tracker will cover an area of 20 square meters, much larger than any silicon detector previously constructed by LHCb. In this talk the challenges of the LHCb phase 2 upgrade program will be discussed and first results of performance studies presented.