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forceface
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I was reading the paper about the discovery of the first e+e- narrow resonancehttp://prl.aps.org/abstract/PRL/v33/i23/p1406_1 and one question that came to my mind, which was why was this discovery important. In my naive understanding I would believe that this pair annihilation could happen anytime, where at low energies only photons would be produced, but at high energies more massive particles has the possibility of being produced and the latter is what is happening in the paper. In my mind this production of particles would be represented by something more steady than a sudden resonance. As the energy increases I would think the cross section for scattered hardons would increase a related rate.