Efficient Data Processing and Monte Carlo Event Generation in the Belle Experiment
Title: Efficient Data Processing and Monte Carlo Event Generation in the Belle Experiment
Abstract: The Belle experiment at the KEKB accelerator is a large-scale physics project aimed at studying CP violation in B meson systems. The experiment has accumulated a vast amount of data, making it crucial to process and analyze this data efficiently. This article discusses the computing system used in the Belle experiment, focusing on data storage, data management, and Monte Carlo event generation. The system has been designed to handle a large data sample and produce analysis event samples in a timely manner.
Main Text:
The Belle experiment is a significant physics project that studies CP violation in B meson systems. The KEKB accelerator, an asymmetric energy collider, operates at the Υ(4 S) energies and has logged more than 160 fb−1 of data, making it the largest data sample of B meson pairs in the world. To process this vast amount of data, the Belle group has developed an efficient computing system that includes data storage, data management, and Monte Carlo event generation.
The computing system uses a unique software framework called B.A.S.F., which is a "home-made" core software developed by the Belle group. This framework allows for dynamic loading of modules, making it easy to process and analyze data. The data handling is done using the PANTHER utility, which compresses data and allows for data transfer between modules. This utility also manages data input and output.
The reconstruction package, which is built periodically, processes all events and produces consistent data sets for analysis. For Monte Carlo events, the detector response is simulated using the GEANT3 library, and background events are overlaid onto the MC events. The same reconstruction codes are applied to both real and simulated events.
The detector calibration constants are stored in a PostgreSQL database, which is mirrored and backed up regularly to ensure data integrity. This allows for efficient data management and analysis.
In conclusion, the computing system used in the Belle experiment has been designed to handle the vast amount of data accumulated in the experiment. It efficiently processes data, generates Monte Carlo events, and manages data storage and management, enabling the Belle group to study CP violation in B meson systems effectively.
Link to Article: https://arxiv.org/abs/0403015v2 Authors: arXiv ID: 0403015v2