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

TL;DR

This paper reports on the development and testing of trigger algorithms for the Belle II electromagnetic calorimeter, using detailed simulations to ensure stable operation under high luminosity and background conditions at the SuperKEKB collider.

Contribution

It presents a detailed simulation study of trigger logics and their efficiencies for the Belle II calorimeter, crucial for stable trigger and data acquisition at high luminosity.

Findings

Preliminary results on trigger logic efficiencies

Simulation-based evaluation of trigger performance

Insights into background suppression techniques

Abstract

The Belle II experiment at KEK in Japan has started real data taking from April 2018 to probe a New Physics beyond the Standard Model by measuring CP violation precisely and rare weak decays of heavy quark and lepton. The experiment is performed at the high luminosity SuperKEKB e^+ e^- collider with 80 x 10^34 cm^-2 s^-1 as an ultimate instantaneous luminosity. In order to develop and test an appropriate trigger algorithm under much higher luminosity and beam background environment than previous KEKB collider, a detail simulation study of the Belle II calorimeter trigger system is very crucial to operate Belle II Trigger and DAQ system in stable. We report preliminary results on various trigger logics and their efficiencies using physics and beam background Monte Carlo events with a Belle II Geant4-based analysis framework called Basf2.