Select a button and then choose a label from the 'control' panel on the
left.The 'anti' button toggles between particles and anti-particles.
Once you have filled in all four buttons the 'submit' button will become
available.You can change a label simply by clicking a button and selecting a new label.
There is more than one correct combination of labels.This time you will be told how many decays (out of two) are correct.
This task will test your understanding of the production and decay of the Higgs Boson as
explained on the previous pages. An event is displayed, with buttons replacing the labels of four particle tracks.