UA5 Experiment

The UA5 experiment was the first experiment conducted at the Proton-Antiproton Collider (SppS), a collider using the infrastructure of the Super Proton Synchrotron. The experiment was approved in February 1979, as a collaboration between Bonn, Brussels, Cambridge, and CERN. The spokesperson of the UA5 collaboration was John Rushbrooke.

The objective of the experiment was to investigate Centauro events. Measurements were done on proton-antiproton collisions of 540 GeV center-of-mass energy, and the results were published in November 1983. Later, under the name of UA5/2, data was recorded from 900 GeV collisions. No indication of Centauro production was observed, but an upper limit on the production was obtained.

The experimental setup consisted of two large streamer chambers which were placed above and below the SppS beam pipe. The chambers were triggered by requiring hits in scintillation counters at each end. This trigger rejected essentially all elastic and diffractive elements. The streamer chamber tracks were photographed by six cameras, and the tracks were measured, reconstructed and analyzed.

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