Three dimensional fast tracker for central drift chamber based level 1 trigger system in the Belle II experiment

TL;DR

This paper presents a 3D tracking algorithm for the Belle II level 1 trigger system, designed to reject beam background effectively while maintaining high efficiency for physics events, utilizing the central drift chamber data.

Contribution

It introduces a novel 3D track trigger algorithm that finds and fits track parameters in real-time for the Belle II experiment's trigger system.

Findings

Effective background rejection demonstrated

High efficiency for physics events maintained

Real-time 3D tracking implemented in FPGA

Abstract

The Belle II detector at the SuperKEKB accelerator has a level 1 trigger implemented in field-programmable gate arrays. Due to the high luminosity of the beam, a trigger that effectively rejects beam induced background is required. A three dimensional tracking algorithm for the level 1 trigger that uses the Belle II central drift chamber detector response is being developed to reduce the recorded beam background while having a high efficiency for physics of interest. In this paper, we describe the three dimensional track trigger that finds and fits track parameters which we developed.