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The output is pure energy but this can appear as particles. Electron - positron collisions are the best known and they are very useful because you can control the amount of energy in the bang by controlling the energy of the particles as they collide and having just the right amount available to make a particle antiparticle pair of different sorts of particles, you can make "factories" that generate the sort of particles you want to observe. OK they may be quite rare because the bangs are mostly gamma rays but you get lots more than the LHC can do.Even so soon after it has been found there are people working out how to build an electron - positron colliding Higgs boson factory in place of the LHC.
The net result of essentially everything is NEUTRAL.So, take a (negative electron) + (a positive positron), and logically (-1) + (+1) = 0 charge. The resulting photons are all neutral.Likewise with a (positive proton) + (negative antiproton), logically (+1) + (-1) = 0 charge and a lot of neutral photons.So much in physics works out neutral.Consider Nuclear Fusion of neutral hydrogen (proton + electron)[tex]^1_1[/tex]H + [tex]^1_1[/tex]H ==> [tex]^2_2[/tex]He (2 protons, 2 electrons) ==> [tex]^2_1[/tex]H + e- + e+So, when the second proton in [tex]^2_2[/tex]He spontaneously releases a positron from the nucleus to form a neutron, the newly formed [tex]^2_1[/tex]H Deuterium also looses one of the electrons from the electron shell, and everything remains neutral. Then eventually the positron will destroy an extra electron (not necessarily the same one that the Helium lost), but the end result is still NEUTRAL.
"Conservation of charge" is a useful principle in physics, along with a few others like "conservation of Energy" and "Conservation of Momentum". Physicists regularly apply these rules to deduce the existence of particles that they cannot see directly, like Neutrinos.Conservation of charge says that the amount of charge going into a reaction is the same as the charge coming out of a reaction.So if the charge going into a matter-antimatter explosion is unequal, the charge coming out of that reaction will also be unequal. For example, an anti-proton (charge: -1) colliding with helium nucleus (charge: +2) will have a debris field with a total charge of +1.In nuclear physics, energy is often released as gamma rays or other forms of electromagnetic energy. These photons are neutral, ie energy with no electric charge (0). It is possible for photons to interact with particles with an electric charge, and again, the total charge going into the reaction is the same as the charge coming out of the reaction.There were some other proposed conservation "laws" that turned out to be violated by the weak nuclear force - this discovery won a Nobel prize. http://en.wikipedia.org/wiki/CP_violation