Challenge V...
Challenge V is even more difficult.
Events of the types you met in II, III and IV will be mixed up together.
We won't tell you in advance which is which.
So, first you have to decide whether the event you're looking at is the
type in which a particle-antiparticle pair has been produced (as in Challenge
II) or it is the type of event in which a W+W-
pair has been produced (as in Challenge III).
After you've done that then see if you can identify exactly which sort of
event you're looking at!
Are you ready?
Accept Challenge V