Author:
Schwickardi M.,Babeluk M.,Barbero M.,Baudot J.,Bergauer T.,Bertolone G.,Bettarini S.,Bosi F.,Breugnon P.,Buch Y.,Casarosa G.,Dujany G.,Finck C.,Forti F.,Frey A.,Himmi A.,Irmler C.,Kumar A.,Marinas C.,Massa M.,Massaccesi L.,Mazzora de Cos J.,Minuti M.,Mondal S.,Pangaud P.,Pham H.,Ripp-Baudot I.,Rizzo G.,Schwenker B.,Valin I.,
Abstract
Abstract
The Belle II experiment at KEK in Japan considers upgrading its vertex detector system to
address the challenges posed by high background levels caused by the increased luminosity of the
SuperKEKB collider. One proposal for upgrading the vertex detector aims to install a 5-layer all
monolithic pixel vertex detector based on fully depleted CMOS sensors in 2027. The new system will
use the OBELIX MAPS chips to improve background robustness and reduce occupancy levels through
small and fast pixels. This causes better track finding, especially for low transverse momenta
tracks. This text will focus on the predecessor of the OBELIX sensor, the TJ-Monopix2, presenting
laboratory and test beam results on pixel response, efficiency, and spatial resolution.
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1. The OBELIX chip for the Belle II VTX upgrade;Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment;2024-10
2. Cross-talk of a large-scale depleted monolithic active pixel sensor (DMAPS) in 180 nm CMOS technology;Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment;2024-07