Progress on the Electromagnetic Calorimeter Trigger Simulation at the Belle II Experiment

I. S. Lee, S. H. Kim, C. H. Kim, H. E. Cho, Y. J. Kim, J. K. Ahn, E. J. Jang, S. K. Choi, Y. Iwasaki, A. Kuzmin, Y. Unno, B. G. Cheon

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The Belle II experiment at the High Energy Accelerator Research Organization (KEK) in Japan started gathering data in Phase II in April 2018 to unravel new physics beyond the standard model by precisely measuring charge conjugation parity symmetry (CP) violation and rare weak decays of heavy quarks and leptons. It was performed at the SuperKEKB electron-positron collider mainly running at the (4S) resonance energy with the goal to reach the maximum instantaneous luminosity of 8× 1035 cm-2 s-1. A new algorithm is needed to operate the Belle II calorimeter trigger system stably in the much higher luminosity and beam background environment of SuperKEKB compared with the KEKB collider. In order to develop an appropriate algorithm, a detailed simulation study of the Belle II calorimeter trigger system is crucial. In this article, we report the results of the simulation of the electromagnetic calorimeter (ECL) trigger using physics and beam background Monte Carlo (MC) events and compare them with the ECL trigger performance in the Phase II operation. The simulation package is developed with the Belle II Geant4-based analysis framework called Basf2.

Original languageEnglish
Article number9061044
Pages (from-to)2143-2147
Number of pages5
JournalIEEE Transactions on Nuclear Science
Issue number9
Publication statusPublished - 2020 Sept
Externally publishedYes

Bibliographical note

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  • Belle II
  • electromagnetic calorimeter (ECL)
  • simulation
  • trigger

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering


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