The Large Electron–Positron Collider

  1. Council approves the Large Electron–Positron collider

    In the late 1970s physicists from CERN Member…

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  2. Civil engineering begins

    The presidents of CERN’s two host countries,…

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  3. LEP tunnel completed

    The excavation of the tunnel for the Large…

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  4. Large Electron–Positron collider: First injection

    With its 27-kilometre circumference, the Large…

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  5. First Z decay into hadrons recorded by OPAL and LEP on 13 August 1989 at 23:17
    First collisions recorded by OPAL at LEP (Image: CERN)

    First collisions

    The OPAL experiment recorded the very first…

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  6. Z boson production and the start of physics data analysis

    The first full-fledged physics run began on 20…

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  7. First physics results

    The four collaborations working on the LEP…

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  8. LEP inauguration ceremony

    (From left) Princess Margriet of the Netherlands…

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  9. Increasing LEP's energy from 90 to 140 GeV

    LEP's year was dominated by preparations for its…

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  10. Nobel prize awarded to Gerardus 't Hooft and Martinus Veltman

    The LEP established the Standard Model of…

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  11. LEP's final shutdown

    The Large Electron–Positron collider was shut…

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