AliceO2Group/O2Physics
Nov 2024 – Dec 2025
11 Months active
Languages Used
C++CMake
Technical Skills
C++CMakeData AnalysisParticle PhysicsC++ DevelopmentHigh Energy Physics
blacwovie
PROFILE
Blacwovie
Meiyi Chen developed advanced femtoscopy and particle physics analysis workflows in the AliceO2Group/O2Physics repository, focusing on He3, deuteron, and hypertriton channels. She engineered configurable data models, flexible event selection, and robust histogramming using C++ and CMake, integrating multi-detector PID and Monte Carlo simulation to improve measurement accuracy and reproducibility. Her work included refactoring for maintainability, expanding QA instrumentation, and introducing new analysis tasks for pi-d, pi-He3, and kaon-deuteron interactions. By enhancing data structures, implementing configuration-driven controls, and refining mixed-event processing, Meiyi delivered reliable, extensible analysis pipelines that support high-precision physics studies and future development.
Overall Statistics
Feature vs Bugs
81%Features
Repository Contributions
35Total
Bugs
4
Commits
35
Features
17
Lines of code
5,240
Activity Months11
Your Network
429 people
Work History
December 2025
4 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for AliceO2Group/O2Physics focused on delivering enhanced physics analysis capabilities and workflow improvements. Implemented new histogram outputs for single-particle momentum distributions and overhauled the kaon-deuteron femto analysis workflow with HadNucleiFemto enhancements, strengthening analysis flexibility and data quality for downstream physics studies.
4 Commits • 2 Features
Dec 1, 2025December 2025 monthly summary for AliceO2Group/O2Physics focused on delivering enhanced physics analysis capabilities and workflow improvements. Implemented new histogram outputs for single-particle momentum distributions and overhauled the kaon-deuteron femto analysis workflow with HadNucleiFemto enhancements, strengthening analysis flexibility and data quality for downstream physics studies.
December 2025
October 2025
6 Commits • 3 Features
Oct 1, 2025October 2025 — AliceO2Group/O2Physics delivered substantial feature enhancements focused on particle identification accuracy, data-model readiness, safe analysis workflows, and flexible femtoscopy histograms. Key features implemented include: 1) Particle Identification and Tracking Data Model Enhancements, enabling track ID output and nsigma PID for pions, kaons, and protons from TPC/TOF, with updates to the data model and table producer to store track IDs for pion and nuclei candidates. 2) Safer Mixed-Event Processing and QA for Pi-D Analysis, introducing configurable cuts for pion TPC/ITS chi2, a safer ME processing flag, and enhanced QA with skip-reason and collision ID histograms. 3) PiNucleiFemto mT Binning Configurability and Histogram Enhancements, adding a configurable axis for transverse mass (axisTransMass), applying it across multiple 3D histograms, refining mT binning, and adding new 2D histograms for kStar vs mT. These changes collectively improve data quality, PID accuracy, and the flexibility of femtoscopy analyses. No critical bugs were reported this month; stability and reliability were enhanced through safer processing and expanded QA instrumentation. Technologies and skills demonstrated include C++ data-model evolution, multi-detector PID integration (TPC/TOF), histogramming and axis configurability, robust event mixing, and QA tooling."
October 2025
6 Commits • 3 Features
Oct 1, 2025October 2025 — AliceO2Group/O2Physics delivered substantial feature enhancements focused on particle identification accuracy, data-model readiness, safe analysis workflows, and flexible femtoscopy histograms. Key features implemented include: 1) Particle Identification and Tracking Data Model Enhancements, enabling track ID output and nsigma PID for pions, kaons, and protons from TPC/TOF, with updates to the data model and table producer to store track IDs for pion and nuclei candidates. 2) Safer Mixed-Event Processing and QA for Pi-D Analysis, introducing configurable cuts for pion TPC/ITS chi2, a safer ME processing flag, and enhanced QA with skip-reason and collision ID histograms. 3) PiNucleiFemto mT Binning Configurability and Histogram Enhancements, adding a configurable axis for transverse mass (axisTransMass), applying it across multiple 3D histograms, refining mT binning, and adding new 2D histograms for kStar vs mT. These changes collectively improve data quality, PID accuracy, and the flexibility of femtoscopy analyses. No critical bugs were reported this month; stability and reliability were enhanced through safer processing and expanded QA instrumentation. Technologies and skills demonstrated include C++ data-model evolution, multi-detector PID integration (TPC/TOF), histogramming and axis configurability, robust event mixing, and QA tooling."
September 2025
12 Commits • 4 Features
Sep 1, 2025September 2025 — AliceO2Group/O2Physics: Delivered a set of substantial femtoscopy enhancements across hypertriton and He3 channels, expanded data models to enable richer analyses, and strengthened the mixed-event processing pipeline. Implementations emphasize robust physics capabilities, QA integration, and more accurate femtoscopy metrics to support upcoming physics results.
12 Commits • 4 Features
Sep 1, 2025September 2025 — AliceO2Group/O2Physics: Delivered a set of substantial femtoscopy enhancements across hypertriton and He3 channels, expanded data models to enable richer analyses, and strengthened the mixed-event processing pipeline. Implementations emphasize robust physics capabilities, QA integration, and more accurate femtoscopy metrics to support upcoming physics results.
September 2025
August 2025
1 Commits • 1 Features
Aug 1, 2025In August 2025, the O2Physics development focus centered on refining particle identification in femtoscopy analyses by enhancing PiDeuteronFemto selection criteria, resulting in improved PID accuracy and data quality. No major bugs were reported this month; the work concentrated on implementing precise TOF/TPC cuts and refactoring selection logic to boost reliability and maintainability. The improvements support higher-precision deuteron femtoscopy results and strengthen the codebase for future physics campaigns.
August 2025
1 Commits • 1 Features
Aug 1, 2025In August 2025, the O2Physics development focus centered on refining particle identification in femtoscopy analyses by enhancing PiDeuteronFemto selection criteria, resulting in improved PID accuracy and data quality. No major bugs were reported this month; the work concentrated on implementing precise TOF/TPC cuts and refactoring selection logic to boost reliability and maintainability. The improvements support higher-precision deuteron femtoscopy results and strengthen the codebase for future physics campaigns.
July 2025
3 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for AliceO2Group/O2Physics focusing on business value and technical achievements. Key feature delivered: Monte Carlo pi-He3 interactions in PWGLF, expanding the data model with new columns for He3 and its mother particles and introducing a new processing function for pi-He3 MC events to enable detailed analysis of these interactions in simulated data. Major bugs fixed: PID bug and QA enhancements in PiDeuteronFemto (PID selection logic for pions and deuterons; added QA histograms and config improvements) and Track selection bug fix in PWGCF (DCAz histogram addition and refined deuteron selection criteria). Overall impact: enhanced accuracy and reliability of MC/simulation to data comparisons, improved QA instrumentation for faster diagnostics, and cleaner track/pion/deuteron analyses, enabling more confident physics conclusions and faster iteration cycles. Technologies/skills demonstrated: Monte Carlo integration and data-model augmentation in PWGLF, analysis processing function development, PID logic and QA instrumentation, track selection tuning (DCAz histogram, deuteron criteria), and cross-module collaboration across PWGLF and PWGCF within O2Physics.
3 Commits • 1 Features
Jul 1, 2025July 2025 monthly summary for AliceO2Group/O2Physics focusing on business value and technical achievements. Key feature delivered: Monte Carlo pi-He3 interactions in PWGLF, expanding the data model with new columns for He3 and its mother particles and introducing a new processing function for pi-He3 MC events to enable detailed analysis of these interactions in simulated data. Major bugs fixed: PID bug and QA enhancements in PiDeuteronFemto (PID selection logic for pions and deuterons; added QA histograms and config improvements) and Track selection bug fix in PWGCF (DCAz histogram addition and refined deuteron selection criteria). Overall impact: enhanced accuracy and reliability of MC/simulation to data comparisons, improved QA instrumentation for faster diagnostics, and cleaner track/pion/deuteron analyses, enabling more confident physics conclusions and faster iteration cycles. Technologies/skills demonstrated: Monte Carlo integration and data-model augmentation in PWGLF, analysis processing function development, PID logic and QA instrumentation, track selection tuning (DCAz histogram, deuteron criteria), and cross-module collaboration across PWGLF and PWGCF within O2Physics.
July 2025
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for AliceO2Group/O2Physics: Implemented PiDeuteronFemto KStar Analysis Enhancement and fixed Deuterium kStar calculation with expanded QA coverage, delivering more accurate pi-deuteron KStar measurements and improved QA visibility across signal and background.
June 2025
2 Commits • 1 Features
Jun 1, 2025June 2025 monthly summary for AliceO2Group/O2Physics: Implemented PiDeuteronFemto KStar Analysis Enhancement and fixed Deuterium kStar calculation with expanded QA coverage, delivering more accurate pi-deuteron KStar measurements and improved QA visibility across signal and background.
May 2025
2 Commits • 1 Features
May 1, 2025Month: 2025-05 — In AliceO2Group/O2Physics, delivered two core enhancements: a code quality-focused refactor of He3HadronFemto and the Pi-d femtoscopy workflow in PWGCF, with emphasis on maintainability, build reliability, and enabling new physics analyses. These changes reduce technical debt, streamline future development, and expand the module's analysis capabilities aligned with data-driven goals.
2 Commits • 1 Features
May 1, 2025Month: 2025-05 — In AliceO2Group/O2Physics, delivered two core enhancements: a code quality-focused refactor of He3HadronFemto and the Pi-d femtoscopy workflow in PWGCF, with emphasis on maintainability, build reliability, and enabling new physics analyses. These changes reduce technical debt, streamline future development, and expand the module's analysis capabilities aligned with data-driven goals.
May 2025
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025: Delivered a configurable DCA fitter option for He3 hadron analysis in O2Physics, enabling flexible analysis paths without breaking existing workflows. Introduced a toggle to enable/disable the DCA fitter and extended the DCAxy histogram range to accommodate potential new values. When enabled, the DCA fitter is used to compute DCA values; otherwise, the existing method remains in use. Preserved backward compatibility and prepared groundwork for broader He3 studies and parameter sweeps in physics campaigns.
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025: Delivered a configurable DCA fitter option for He3 hadron analysis in O2Physics, enabling flexible analysis paths without breaking existing workflows. Introduced a toggle to enable/disable the DCA fitter and extended the DCAxy histogram range to accommodate potential new values. When enabled, the DCA fitter is used to compute DCA values; otherwise, the existing method remains in use. Preserved backward compatibility and prepared groundwork for broader He3 studies and parameter sweeps in physics campaigns.
March 2025
2 Commits • 1 Features
Mar 1, 2025In 2025-03, delivered configurable ITS-based track quality filtering for the he3HadronFemto analysis within AliceO2Group/O2Physics. This includes a configurable Ncluster cut, a new setting_cutChi2NClITS threshold, updated filtering logic to consume the new configuration, and additional QA histograms and member variables to support validation. Two commits implemented the feature, finalizing configurability and integration with the existing filter pipeline. No major bugs were reported for this work this month. Overall impact: enhanced tunability, reproducibility, and data-quality assurance for track selection, enabling more precise femto analyses and streamlined performance optimization. Technologies demonstrated: C++ analysis development, configuration-driven filtering, QA instrumentation, and robust commit traceability.
2 Commits • 1 Features
Mar 1, 2025In 2025-03, delivered configurable ITS-based track quality filtering for the he3HadronFemto analysis within AliceO2Group/O2Physics. This includes a configurable Ncluster cut, a new setting_cutChi2NClITS threshold, updated filtering logic to consume the new configuration, and additional QA histograms and member variables to support validation. Two commits implemented the feature, finalizing configurability and integration with the existing filter pipeline. No major bugs were reported for this work this month. Overall impact: enhanced tunability, reproducibility, and data-quality assurance for track selection, enabling more precise femto analyses and streamlined performance optimization. Technologies demonstrated: C++ analysis development, configuration-driven filtering, QA instrumentation, and robust commit traceability.
March 2025
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024: Delivered a configurable Helium-3 ITS n-sigma cut in O2Physics with saving options, enabling improved particle identification (PID) and flexible data saving for background analysis. The feature updates include configurable parameters for ITS n-sigma selection and for saving options (save all pairs LS/US), with corresponding updates to histogram definitions and track selection logic to integrate the new cut and saving configurations.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024: Delivered a configurable Helium-3 ITS n-sigma cut in O2Physics with saving options, enabling improved particle identification (PID) and flexible data saving for background analysis. The feature updates include configurable parameters for ITS n-sigma selection and for saving options (save all pairs LS/US), with corresponding updates to histogram definitions and track selection logic to integrate the new cut and saving configurations.
November 2024
1 Commits • 1 Features
Nov 1, 20242024-11 Monthly Summary for AliceO2Group/O2Physics: Focused on delivering targeted physics analysis capabilities with refactoring for maintainability. No major defects closed this month; primary effort centered on feature delivery and build/data-model readiness to support upcoming femtoscopy analyses.
1 Commits • 1 Features
Nov 1, 20242024-11 Monthly Summary for AliceO2Group/O2Physics: Focused on delivering targeted physics analysis capabilities with refactoring for maintainability. No major defects closed this month; primary effort centered on feature delivery and build/data-model readiness to support upcoming femtoscopy analyses.
November 2024
Activity
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Quality Metrics
Correctness83.0%
Maintainability82.6%
Architecture81.0%
Performance68.6%
AI Usage20.6%
Skills & Technologies
Programming Languages
C++CMake
Technical Skills
C++C++ DevelopmentC++ programmingCMakeData AnalysisData ModelingData ProcessingData StructuresEvent ReconstructionFemtoscopyHigh Energy PhysicsHypertriton AnalysisMonte Carlo SimulationParticle PhysicsParticle Physics Analysis
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