As contracts are being tendered for the construction of LEP, the gargantuan electron–positron colliding‐beam accelerator that will straddle the French–Swiss frontier at CERN, the time has come to settle on the four detectors that will occupy the four underground experimental halls to be used in the first phase of LEP operation, which is scheduled to begin toward the end of 1987. In January, letters of intent outlining detector designs for the four experimental beam‐intersection areas were submitted by six large multinational collaborations.

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