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Hi Tony et al, I kept finding unknown IDs in the event generator events I use (Pandora_Pythia), so I started to update DefaultParticlePropertyProvider.java, as Maha and I did once before. I realised that doing it by hand was not very smart, but I didn't want to tackle learning XML to fulfil the wish expressed in the .java file. So instead, I have written a FORTRAN program into which one pastes the Block Data section of PYTHIA (I got the latest release) and it outputs the PART entries of DefaultParticlePropertyProvider. According to the manual, all except a few "rare" particles follow the PDG ID convention. In the DefaultParticlePropertyProvider.java there are INTERACT entries related to forces. I couldn't figure out the intended use and whether their placement with respect to the PART entries was relevant. So, a couple of questions: 1. Has the XML version (to read the PDG web info directly) been written? 2. Should I provide a PYTHIA derived DefaultParticlePropertyProvider or a new ParticlePropertyProvider? If so where and how? 3. What should I do with the INTERACT lines? Bob -- Robert J. Wilson Professor of Physics Department of Physics Colorado State University Fort Collins, CO 80523 Phone: (970) 491 5033 Fax: (970) 491 7947 Email: [log in to unmask] August 2000 - July 2001: ======================== Institut de Fisica d'Altes Energies Universitat Autonoma de Barcelona E-08193 Bellaterra (Barcelona) SPAIN Phone: (011 34) 93 581.33.22 Email: [log in to unmask] ========================