The persistence and availability of data collected in past physics experiments have always been limiting factors for their reuse after the scientific collaboration has ended, as no common rules for digital data preservation have been adopted by the community. The Future Circular Collider feasibility study is considering the construction of an electron-positron collider as CERN’s next flagship project to study the Higgs boson and other fundamental particles of the Standard Model in detail. In this context, reusing the data collected during the operation of the Large Electron-Positron Collider (LEP) would provide multiple benefits. First, it would allow scientists to test event reconstruction and analysis techniques developed in past years in an e+e− environment. Additionally, it would offer the opportunity to train a new generation of scientists by analyzing real data with recently developed common software tools. Moreover, these new tools could be applied for the first time to real (i.e., non-simulated) physics data, providing insights into their potential and limitations. In the long term, they may evolve into a general and standardized data format for future experiments, representing a crucial step toward improving data accessibility and establishing a common data preservation policy. This work aims to define and implement for the first time a strategy to convert the data collected by ALEPH, one of the four LEP experiments, into Key4hep, the new software framework developed for future experiments. This process includes extensive validation and testing of the conversion workflow to ensure that the data remain unaltered during the transition.
La persistenza e la disponibilità dei dati raccolti in passato dagli esperimenti di fisica delle particelle sono sempre stati fattori limitanti per il loro riutilizzo al termine delle collaborazioni scientifiche. Questo problema nasce dall’assenza di regole e strategie comuni per la conservazione dei dati. Lo studio di fattibilità del Future Circular Collider sta considerando la costruzione di un collisore elettrone-positrone per studiare in dettaglio il bosone di Higgs e altre particelle fondamentali del Modello Standard. In questo contesto, l’utilizzo dei dati raccolti durante il funzionamento di LEP offrirebbe diversi vantaggi. Da un lato, consentirebbe di testare in un ambiente e+e− tecniche di ricostruzione e analisi degli eventi sviluppate recentemente. Dall’altro, offrirebbe l’opportunità di formare una nuova generazione di scienziati, permettendo loro di analizzare dati reali usando i nuovi strumenti software sviluppati negli ultimi anni. Inoltre, questi strumenti potrebbero essere applicati per la prima volta a dati fisici reali, anziché a eventi simulati. Questo permetterebbe di valutarne il potenziale e gli eventuali limiti e potrebbe favorire lo sviluppo di un formato dati generale e standard per i futuri esperimenti. Un tale formato costituirebbe il primo passo per promuovere una maggiore accessibilità ai dati e l’adozione di una politica comune per la loro conservazione. Questo progetto mira a definire e implementare per la prima volta una strategia per convertire i dati raccolti da ALEPH, uno dei quattro esperimenti a LEP, in Key4hep, il nuovo framework software sviluppato per i futuri esperimenti. Il processo prevede anche un’ampia fase di validazione e test del workflow di conversione, per garantire che i dati non subiscano modifiche durante il trasferimento.
Import data from the ALEPH experiment at LEP in Key4hep under the FCC software
Fanini, Jacopo
2023/2024
Abstract
The persistence and availability of data collected in past physics experiments have always been limiting factors for their reuse after the scientific collaboration has ended, as no common rules for digital data preservation have been adopted by the community. The Future Circular Collider feasibility study is considering the construction of an electron-positron collider as CERN’s next flagship project to study the Higgs boson and other fundamental particles of the Standard Model in detail. In this context, reusing the data collected during the operation of the Large Electron-Positron Collider (LEP) would provide multiple benefits. First, it would allow scientists to test event reconstruction and analysis techniques developed in past years in an e+e− environment. Additionally, it would offer the opportunity to train a new generation of scientists by analyzing real data with recently developed common software tools. Moreover, these new tools could be applied for the first time to real (i.e., non-simulated) physics data, providing insights into their potential and limitations. In the long term, they may evolve into a general and standardized data format for future experiments, representing a crucial step toward improving data accessibility and establishing a common data preservation policy. This work aims to define and implement for the first time a strategy to convert the data collected by ALEPH, one of the four LEP experiments, into Key4hep, the new software framework developed for future experiments. This process includes extensive validation and testing of the conversion workflow to ensure that the data remain unaltered during the transition.| File | Dimensione | Formato | |
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2025_04_Fanini_Tesi.pdf
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Descrizione: Tesi
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2025_04_Fanini_Executive Summary.pdf
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Descrizione: Executive summary
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https://hdl.handle.net/10589/234939