Protons are produced to collide in the LHC. At high enough energies, protons do not react as a whole, so that only their constituent parts interact with each other. This gives you the possibility to draw a conclusion about the inner structure of the proton by analysing the products of the collisions. The measurement task is to find and count all events in which a W particle was produced. The W particle decays into a lepton (electron or positron, or muon or antimuon) and the accompanying neutrino already within the proton. We call these events signal events. In addition you'll see a lot of background processes.



The following outline gives you a better overview of all possible signal and background events:

In order to identify an event as a signal event you should notice the following criteria. It is realy a signal event, if

Only if an event fulfills these two criteria, we are able to recognize that a W particle was created and thus we call it a signal event.

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