Additional Package For Event Generation
The integration of the "matrix element" over the multidimensional internal parameters phase space provides the total and differential cross-sections. Each point of this phase space is associated to an event probability. This is used to randomly generate events closely mimicking experimental data. This is called event generation, the first step in the complete chain of event simulation. The initial and final state particles can be elementary particles like electrons, muons, or photons but also partons (protons and neutrons).
More effects must then be implemented to reproduce real life events as those detected at the colliders.
The initial electron or positron may undergo radiation before they actually interact: initial state radiation and beamstrahlung.
The bare partons that do not exist in nature (they are confined inside the hadrons) must be so to say dressed so that they form the known hadrons or mesons. They are made in two steps: parton shower and hadronization.
When the initial state particles are protons at high energy, it is only their constituents which interact. Therefore the specific parton that will experience the "hard interaction" has to be selected. Structure functions must therefore be implemented. The other parton may interact "softly" must be also be simulated as they contribute to the complexity of the event: Underlying event
Read more about this topic: Automatic Calculation Of Particle Interaction Or Decay
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