Speaker
Description
The LHCb Collaboration is preparing for a Phase-II upgrade to fully exploit the potential of HL-LHC. The detector will operate during Run 5 at an instantaneous luminosity of up to 1.5x10^34 cm-2s-1. To maintain and ideally improve detector performance, all subdetectors will be replaced with new systems, either entirely or in their central regions.
The Upstream Tracker is located upstream of the dipole magnet, serving as the middle component of the three-subdetector tracking system. It plays a crucial role in reducing the ghost track rate, enhancing the software-based trigger speed, and significantly improving the reconstruction efficiency of long-lived particles.
The current detector will be fully replaced by a MAPS-based detector - the Upstream Pixel tracker (UP). Several sensor chips that use different CMOS imaging processes from different foundries are under development. The one that aligns with the upgrade timeline and meets the requirements will eventually be chosen. Meanwhile, the UP team is advancing the detector development through simulation studies, while designing and prototyping key detector components, preparing for a TDR due by the end of 2026. The presentation will outline the sensor chip requirements, introduce the chip design and tests, describe the detector component R&D activities and the production plan.
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