Speaker
Description
The LHCb experiment is planning a second major upgrade (Upgrade II) in the 2030s, with the goal of increasing the instantaneous luminosity to 1.0x1034 cm−2s−1. This upgrade aims to enhance the study of heavy flavor physics and to search for potential signals of new physics in the beauty and charm quark sectors. To operate under the demanding conditions of Upgrade II—characterized by higher radiation levels and significantly increased data rates—the LHCb detector will undergo substantial upgrades. For instance, the current Upstream Tracker (UT), which is based on silicon strip sensors, will be replaced by a new pixel sensor detector, known as the Upstream Pixel Tracker (UP).
The primary function of the UP detector within the LHCb tracking system is to reduce the rate of ghost tracks and accelerate track reconstruction, particularly within the LHCb trigger system. It also enhances the reconstruction efficiency for long-lived particles such as KS0 and Λ0. Currently, the detector is in the research and development (R&D) phase, with the goal of delivering the Upgrade II Technical Design Report (TDR) by 2026.
The presentation begins with an overview of the UP detector design, including the detector layout and the pixel sensor chip options under consideration from different foundries. It then presents simulation studies of the new UP detector and discusses its expected performance under the LHCb Upgrade II conditions.