LHC puts ALICE on the spot

Once again, the "event" is really a summation of events. These graphs show the consistency of the performance of the LHC and ALICE. The first graph shows the vertices of many events over several months—standard model particle decays, background events, etc.—in the plane perpendicular to the beam: they are all concentrated in a tight bluish spot. Each of the next three sum up the events in one dimension: Z (beamline), X, or Y. All three are narrow peaks, as they should be. Collsions in ALICE the very opposite of "all over the place".

Credit: Copyright CERN for the benefit of the ALICE Collaboration

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Taken on October 1, 2010
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