Glossary

BR
Beam Remnants; not much used since it may be confused with Branching Ratio
FSR
Final-State Radiation, implemented in terms of timelike showers
ISR
Initial-State Radiation, implemented in terms of spacelike showers
MI
Multiple Interactions, i.e. several (more or less) independent parton-parton subcollisions as part of a hadron-hadron event (sometimes also called MPI, with P for parton or parton-parton)
PDF
Parton Distribution Function (alternatively Parton Density Function)
pileup
several hadron-hadron collisions in a bunch crossing
RPP
Review of Particle Physics, the biannual review by the ParticleData Group (PDG) from which many Standard-Model parameter values and much particle data has been taken (but, given the poor data on many hadron resonances, a lot of extra (guess)work is needed)
setting
collectively used to denote all the boolean flag, integer mode, double-precision parm and string word variables that can be set by the user to steer the behaviour of a run; normally particle data are considered separately but clearly are closely related