sgmasterclass

This is a 3 quark jet because there are three jets and it is not all distributed in one level. So, quarks!

This is a muon because there are x's which means there are muons going through the muon detectors, and only traces of muons would leave this x signature on the graph.

This is an electron because all of the energy is deposited in ECAL.

This is a tau because it is magnetic and has a charge because it turns. You can tell it's another tau because the energy signature is so low that it's not being deposited in any of the other levels. This can be accounted for by the use/appearance of neutrinos.