MonteCarlo
TDatabasePDG
The method ReadPDGTable of TDatabasePDG was setting the stable flags for
all particles regardless of their width.
TParticlePDG
The value reported in the fLifetime variable of TParticlePDG is in seconds
while in the documentation is was indicated in nanoseconds.
pdg_table.txt
Particles with a width greater than 1e-10 have now the stable flag set to 1.