English

Development for the Belle II vertex detector upgrade with depleted monolithic active pixel sensors

Instrumentation and Detectors 2026-07-01 v1 High Energy Physics - Experiment
Authors: Y. Onuki , M. Babeluk , T. Bergauer , M. Friedl , C. Irmler , B. Pilsl , R. Russo , C. Schwanda , L. Gaioni , V. Re , E. Riceputi , G. Traversi , S. Giroletti , L. Ratti , G. F. Benfratello , S. Bettarini , F. Bosi , G. Casarosa , L. Corona , F. Forti , A. Gabrielli , M. Massa , L. Massaccesi , M. Minuti , A. Moggi , S. Mondal , G. Rizzo , M. Rovini , A. Taffara , M. Barbero , P. Barrillon , R. Boudagga , P. Breugnon , D. Fougeron , P. Pangaud , J. Serrano , V. Vobbilisetti , D. Xu , D. Auguste , J. Bonis , Y. Peinaud , M. Winter , J. Baudot , G. Bertolone , A. Dorokhov , G. Dujany , L. Federici , C. Finck , A. Himmi , C. Hu-Guo , A. Kumar , M. Maushart , F. Morel , H. Pham , I. Ripp-Baudot , R. Sefri , P. Stavroulakis , I. Valin , F. Bernlochner , C. Bespin , J. Dingfelder , T. Kishishita , H. Krüger , L. Schall , M. Vogt , M. Karagounis , Y. Buch , A. Frey , B. Schwenker , M. Schwickardi , K. Hara , D. Jeans , K. R. Nakamura , Y. Okazaki , T. Higuchi , S. Wang , C. Lacasta , C. Marinas , J. Mazorra de Cos , L. Molina-Bueno , A. Bevan , M. Bona , D. Howgill , W. Song , J. Gong , X. Gao , A. Fernandez Prieto , A. Gallas Torreira
View on arXiv ↗ PDF ↗

Abstract

The vertex detector upgrade project for the Belle II experiment, based on CMOS depleted monolithic active pixel sensor technology, is planned to be carried out in conjunction with the major modification of the interaction region of the SuperKEKB collider during Long Shutdown 2 from 2032 to 2034. The MAPS sensor, named OBELIX currently under development, is derived from the successor to TJ-Monopix2, with modifications implemented to ensure compatibility with the Belle II trigger system. The new vertex detector consists of two layers of four self-supported consecutive OBELIX sensors, and three layers of discrete OBELIX sensors mounted on mechanical support structures with readout flex circuits attached to the sensors. The detector is arranged cylindrically around the beam pipe at radii ranging from 14 mm to 140 mm. The minimization of the material budget is required in order to enhance physics performance. We present an overview of the project and its latest developments, with particular emphasis on the development of low-material-budget flex circuits employing aluminum conductors.

Keywords

vertex detector MAPS CMOS sensor Belle II SuperKEKB material budget flex circuit

Cite

@article{arxiv.2607.00741,
  title  = {Development for the Belle II vertex detector upgrade with depleted monolithic active pixel sensors},
  author = {Y. Onuki and M. Babeluk and T. Bergauer and M. Friedl and C. Irmler and B. Pilsl and R. Russo and C. Schwanda and L. Gaioni and V. Re and E. Riceputi and G. Traversi and S. Giroletti and L. Ratti and G. F. Benfratello and S. Bettarini and F. Bosi and G. Casarosa and L. Corona and F. Forti and A. Gabrielli and M. Massa and L. Massaccesi and M. Minuti and A. Moggi and S. Mondal and G. Rizzo and M. Rovini and A. Taffara and M. Barbero and P. Barrillon and R. Boudagga and P. Breugnon and D. Fougeron and P. Pangaud and J. Serrano and V. Vobbilisetti and D. Xu and D. Auguste and J. Bonis and Y. Peinaud and M. Winter and J. Baudot and G. Bertolone and A. Dorokhov and G. Dujany and L. Federici and C. Finck and A. Himmi and C. Hu-Guo and A. Kumar and M. Maushart and F. Morel and H. Pham and I. Ripp-Baudot and R. Sefri and P. Stavroulakis and I. Valin and F. Bernlochner and C. Bespin and J. Dingfelder and T. Kishishita and H. Krüger and L. Schall and M. Vogt and M. Karagounis and Y. Buch and A. Frey and B. Schwenker and M. Schwickardi and K. Hara and D. Jeans and K. R. Nakamura and Y. Okazaki and T. Higuchi and S. Wang and C. Lacasta and C. Marinas and J. Mazorra de Cos and L. Molina-Bueno and A. Bevan and M. Bona and D. Howgill and W. Song and J. Gong and X. Gao and A. Fernandez Prieto and A. Gallas Torreira},
  journal= {arXiv preprint arXiv:2607.00741},
  year   = {2026}
}

Comments

10 pages, 9 figures