Analysis of W Decays: Counting the quark colours  On your desk
should be (ask if not!) a piece of paper with a list of 20
events. Fill in the list, and calculate the number of colours
using the equation given. If you would like to know where the
equation comes from, have a look at the this description.  Your
list identifies 20 individual events from those in the  W event
sample.  We shall calculate a total by adding up all the results
from the room. This will be considerably more accurate.