Alexander Puck Neuwirth — Notes Personal research site of Alexander Puck Neuwirth, a theoretical and computational particle physicist working on perturbative QCD, electroweak corrections, photon production and Monte Carlo event generators. 2026-10-16T17:37:48+00:00 https://alexander-neuwirth.com/ Alexander Puck Neuwirth A common Rivet validation layer across POWHEG, GENEVA, MCFM and JetPhox https://alexander-neuwirth.com/notes/rivet-validation-interfaces/ 2026-10-16T00:00:00+00:00 2026-10-16T00:00:00+00:00 Notes on building Rivet/HepMC interfaces for several otherwise incompatible fixed-order and parton-shower codes, so their predictions can be validated and cross-compared through one analysis layer. Migrating POWHEG BOX from SVN to Git https://alexander-neuwirth.com/notes/powheg-svn-to-git-migration/ 2026-10-16T00:00:00+00:00 2026-10-16T00:00:00+00:00 Notes on moving the POWHEG BOX event-generator code and its several dozen physics-process repositories from a single SVN trunk to Git on GitLab, presented to and adopted by the POWHEG authors. Why prompt-photon predictions still need fragmentation functions https://alexander-neuwirth.com/notes/photon-fragmentation-why-it-matters/ 2026-08-20T00:00:00+00:00 2026-08-20T00:00:00+00:00 A plain-language look at why isolated prompt-photon measurements still depend on parton-to-photon fragmentation, and what a PYTHIA-based extraction adds.