What do they do?
Are these some kind of intermediary in subatomic interactions, thus explaining any of various forces and fields? Are they just something that can exist, for a short time, if you smash protons together hard and fast enough? Do they actually exist all the time and the LHC 'saw' them in the same way that it saw the Higgs boson, by kicking them out of their subatomic quantum bed with an almighty burst of energy?