AliceO2Group/O2Physics
Nov 2024 – Aug 2025
5 Months active
Languages Used
C++
Technical Skills
C++ DevelopmentData CalibrationDetector PhysicsPhysics AnalysisCalibrationData Processing
peressounko
PROFILE
Peressounko
Dmitri Peressounko developed and enhanced calibration, event selection, and data analysis features in the AliceO2Group/O2Physics repository over five months. He integrated PWGEM energy calibration with CCDB, enabling timestamp-based parameter retrieval and improving energy measurement precision using C++. Dmitri refined non-linearity corrections and parameterizations for both data and Monte Carlo simulations, updated build configurations, and introduced software trigger selection to optimize event filtering. His work included advancing event mixing strategies by incorporating event plane orientation and refactoring selection logic for robustness. These contributions deepened the repository’s calibration and analysis capabilities, supporting more accurate and reproducible physics measurements and simulations.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
6Total
Bugs
0
Commits
6
Features
5
Lines of code
1,627
Activity Months5
Your Network
429 people
Work History
August 2025
1 Commits • 1 Features
Aug 1, 2025August 2025 focused on delivering PWGEM Event Selection and Mixing Enhancements in AliceO2Group/O2Physics. Key work includes refactoring the event selection logic for improved accuracy and robustness, introducing new parameters and updating existing ones to better categorize events by trigger information, vertex position, and track properties. The event mixing strategy was enhanced by incorporating event plane orientation, enabling more refined analyses of particle correlations. A fixes-oriented commit was included to address PWGEM event selection issues (commit a9e5e4ff69ac28fefeda1b7882c8c50ffead8693, [PWGEM] event selection fixes (#12408)). Overall, these changes improve physics analysis reliability, reproducibility, and the ability to draw more precise conclusions from PWGEM studies.
1 Commits • 1 Features
Aug 1, 2025August 2025 focused on delivering PWGEM Event Selection and Mixing Enhancements in AliceO2Group/O2Physics. Key work includes refactoring the event selection logic for improved accuracy and robustness, introducing new parameters and updating existing ones to better categorize events by trigger information, vertex position, and track properties. The event mixing strategy was enhanced by incorporating event plane orientation, enabling more refined analyses of particle correlations. A fixes-oriented commit was included to address PWGEM event selection issues (commit a9e5e4ff69ac28fefeda1b7882c8c50ffead8693, [PWGEM] event selection fixes (#12408)). Overall, these changes improve physics analysis reliability, reproducibility, and the ability to draw more precise conclusions from PWGEM studies.
August 2025
March 2025
1 Commits • 1 Features
Mar 1, 2025March 2025 (2025-03): Delivered a Calorimeter Energy Non-Linearity Parameterization Enhancement in the O2Physics codebase (AliceO2Group/O2Physics). Refined non-linearity correction parameters for Data Run3 and MC simulations in caloClusterProducer, updated parameterization coefficients, and increased the minimum energy threshold from 100 MeV to 250 MeV to improve energy measurement accuracy. Integrated the final non-linearity fix (#10320) into the production path (commit 2784fd9f89a40984948bf3c7b0790206fa7197d6). Result: stronger calorimeter energy reconstruction, better data/MC agreement, and more reliable physics selections across Run3 datasets.
March 2025
1 Commits • 1 Features
Mar 1, 2025March 2025 (2025-03): Delivered a Calorimeter Energy Non-Linearity Parameterization Enhancement in the O2Physics codebase (AliceO2Group/O2Physics). Refined non-linearity correction parameters for Data Run3 and MC simulations in caloClusterProducer, updated parameterization coefficients, and increased the minimum energy threshold from 100 MeV to 250 MeV to improve energy measurement accuracy. Integrated the final non-linearity fix (#10320) into the production path (commit 2784fd9f89a40984948bf3c7b0790206fa7197d6). Result: stronger calorimeter energy reconstruction, better data/MC agreement, and more reliable physics selections across Run3 datasets.
February 2025
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for AliceO2Group/O2Physics focusing on Pi0 energy calibration and photon timing enhancements, including nonlinearity corrections, new histograms, and time-based analysis. Delivered improvements through targeted commits; improved energy measurement accuracy and data quality; enabled time-resolved Pi0/ photon analyses and richer histograms; corrected histogram naming and time cuts.
2 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for AliceO2Group/O2Physics focusing on Pi0 energy calibration and photon timing enhancements, including nonlinearity corrections, new histograms, and time-based analysis. Delivered improvements through targeted commits; improved energy measurement accuracy and data quality; enabled time-resolved Pi0/ photon analyses and richer histograms; corrected histogram naming and time cuts.
February 2025
January 2025
1 Commits • 1 Features
Jan 1, 2025Concise monthly summary for 2025-01: Delivered targeted PHOS cluster producer enhancements in AliceO2Group/O2Physics, focusing on non-linearity corrections, software trigger integration, and maintainability improvements. Added non-linearity parameterizations for data and MC, and updated build configuration (PWGEM CMakeLists) to ensure robust CI and deployment. These changes improve reconstruction accuracy, enable more efficient event selection, and set a solid foundation for data/MC parity improvements and future feature extensions.
January 2025
1 Commits • 1 Features
Jan 1, 2025Concise monthly summary for 2025-01: Delivered targeted PHOS cluster producer enhancements in AliceO2Group/O2Physics, focusing on non-linearity corrections, software trigger integration, and maintainability improvements. Added non-linearity parameterizations for data and MC, and updated build configuration (PWGEM CMakeLists) to ensure robust CI and deployment. These changes improve reconstruction accuracy, enable more efficient event selection, and set a solid foundation for data/MC parity improvements and future feature extensions.
November 2024
1 Commits • 1 Features
Nov 1, 2024November 2024: Delivered PWGEM energy calibration integration with CCDB in O2Physics. Introduced a CCDB manager to fetch calibration parameters based on event timestamps, and applied the calculated energy for histogram filling in place of raw amplitude to improve energy measurement precision and data quality. The change is captured in commit b495fc6a4695e133f67501db15fcb6c35c18f267 with message '[PWGEM] Apply calibration to cell energy (#8660)'. No major bugs fixed this month. Overall, the work improves energy resolution for PWGEM, enabling more accurate physics analyses and cleaner histograms.
1 Commits • 1 Features
Nov 1, 2024November 2024: Delivered PWGEM energy calibration integration with CCDB in O2Physics. Introduced a CCDB manager to fetch calibration parameters based on event timestamps, and applied the calculated energy for histogram filling in place of raw amplitude to improve energy measurement precision and data quality. The change is captured in commit b495fc6a4695e133f67501db15fcb6c35c18f267 with message '[PWGEM] Apply calibration to cell energy (#8660)'. No major bugs fixed this month. Overall, the work improves energy resolution for PWGEM, enabling more accurate physics analyses and cleaner histograms.
November 2024
Activity
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Quality Metrics
Correctness83.4%
Maintainability80.0%
Architecture80.0%
Performance65.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C++
Technical Skills
C++C++ DevelopmentCalibrationData AnalysisData CalibrationData ProcessingDetector PhysicsDetector SimulationEvent SelectionParameterizationPhysics AnalysisPhysics SimulationSoftware Development
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