Julia HepMC3 project

_gsocprojects/2025/project_JuliaHEP.md

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+---
+project: JuliaHEP
+title: JuliaHEP
+layout: default
+logo: juliahep/juliaheplogo.png
+description: |
+  The [JuliaHEP](https://hepsoftwarefoundation.org/activities/juliahep.html) working group brings together a community of developers and users of Julia in Particle Physics, with the aim of improving the sharing of knowledge and expertise, as well as unify effort in developing Julia packages useful for the community.
+---
+
+{% include gsoc_project.ext %}

_gsocproposals/2025/proposal_JuliaHepMC3.md

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+---
+title: Julia Interfaces to HepMC3
+layout: gsoc_proposal
+project: JuliaHEP
+year: 2025
+organization:
+    - CERN
+difficulty: medium
+duration: 175
+mentor_avail: June-July- August
+---
+
+## Description
+
+In high-energy physics experiments at [CERN](https://home.cern/) it is necessary to simulate physics events in order to compare predicted observations with those that the LHC experiments actually observe. A key piece of the software chain used to do that is the [HepMC3](https://arxiv.org/abs/1912.08005) event record library, which encodes the output from physics event generators in a standard way, so that they can be used by downstream detector simulation and analysis codes.
+
+There is now [increasing interest](https://doi.org/10.1007/s41781-023-00104-x) in using [Julia](https://julialang.org/) as a language for HEP software, as it combines the ease of programming in interactive languages, e.g., Python, with the speed of compiled language, such as C++. As part of building up the ecosystem of supporting packages for Julia in high-energy physics, developing interfaces to read, manipulated and write HepMC3 event records in Julia is the aim of this project.
+
+## Task ideas
+
+This project would develop a wrapper library for [HepMC3](https://gitlab.cern.ch/hepmc/HepMC3) allowing the HepMC3 data objects and methods, in C++, to be called from Julia.
+
+It would utilise the general underlying wrapper interfaces in [CxxWrap](https://github.com/JuliaInterop/CxxWrap.jl) and the automated wrapper code generator [WrapIt!](https://github.com/grasph/wrapit) to allow for as easy and maintainable an interface as possible.
+
+A key outcome would be a set of unit tests and examples, based on the HepMC3 ones, demonstrating how to use the library and proving that the code is correct.
+
+## Expected results and milestones
+
+- Reading of HepMC3 event files
+    - Particularly the ASCII format will be targeted first
+- Access to event data structures
+    - Access to particle properties
+    - Navigation of the event and the vertices between parent and child particles
+    - Access to run information
+- Update of HepMC3 data structures
+- Creation of new HepMC3 events
+- Re-serialisation of these events to file
+    - Initially ASCII
+- Documentation and examples on how to use the Julia interfaces
+- HepMC3.jl package registered in the Julia general registry
+- Extension of serialisation to ROOT format (stretch goal)
+
+## Requirements
+
+- Programming experience in C++
+- Prior experience in Julia (very advantageous)
+- A background understanding of high-energy physics (advantageous)
+
+## Evaluation Exercise
+
+TDB
+
+## Mentors
+
+- **[Graeme Stewart](mailto:[email protected])**
+- [Mateusz Fila](mailto:[email protected])
+
+## Links
+
+- [Julia Programming Language](https://julialang.org/)
+- [JuliaHEP HSF Group](https://hepsoftwarefoundation.org/workinggroups/juliahep.html)
+- [HepMC3 Repository](https://gitlab.cern.ch/hepmc/HepMC3)
+- [CxxWrap](https://github.com/JuliaInterop/CxxWrap.jl)
+- [WrapIt!](https://github.com/grasph/wrapit)

gsoc/2025/mentors.md

@@ -10,6 +10,7 @@ layout: plain
 * Andy Buckley [[email protected]](mailto:[email protected]) UofGlasgow
 * Vipul Cariappa [[email protected]](mailto:[email protected]) CompRes
 * Chris Gutschow [[email protected]](mailto:[email protected]) UCLondon
+* Mateusz Fila [[email protected]](mailto:[email protected]) CERN
 * Aaron Jomy [[email protected]](mailto:[email protected]) CERN/CompRes
 * Stephan Lachnit [[email protected]](mailto:[email protected]) DESY
 * David Lange [[email protected]](mailto:[email protected]) CompRes
@@ -18,6 +19,7 @@ layout: plain
 * Alexander Penev [[email protected]](mailto:[email protected]) CompRes/University of Plovdiv, BG
 * Mayank Sharma [[email protected]](mailto:[email protected]) UMich
 * Simon Spannagel [[email protected]](mailto:[email protected]) DESY
+* Graeme Stewart [[email protected]](mailto:[email protected]) DESY
 * Martin Vasilev [[email protected]](mailto:[email protected]) University of Plovdiv, BG
 * Vassil Vassilev [[email protected]](mailto:[email protected]) CompRes
 * Valentin Volkl [[email protected]](mailto:[email protected]) CERN