A high energy photon also interacts in the electromagnetic field region of an atom to produce an electron and positron pair. The total number of particles formed and the depth to which the shower extends into the detector can be used to calculate the energy of the initiating particle. A charged particle track in the tracking system that matches an electromagnetic shower is identified as an electron or a positron. The sign of the charge can be seen from the way the track curves in the magnetic field in the drift chamber. An electromagnetic shower that does not have a charged particle track pointing towards it is identified as a high energy photon.
Muons have exactly the same interactions as electrons.
However, the behavior of high-energy muons as they through matter is quite different from that of electrons. The reason is that the muon is about 210 times more massive than the electron, and the force on it from the electric field is the same because the charge on it is the same as the charge on an electron. That force is not large enough to cause the muon to change direction significantly. It goes right on through the field region without radiating photons to produce any pairs or slowing down significantly. Hadron Showers Hadrons are so much more massive than electrons, they are not significantly deflected by the atomic electric fields.