MARS problems
The code seems to produce too many p-,
particularly at low energies
This could be my error, or an error in the code
itself, or a mislabelling of particle IDs 3 and 4
at some stage, or a real effect
Has anyone else found they have at least
twice as many negative as positive pions
coming out of their target?!
Intuitively the excess should be of p+