28/05/2012 GMT

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<p>Professor Jim al-Khalili talks to Cern physicist Tejinder Virdee, about the search for the elusive Higgs boson, also known as the "God particle". </p><p>Last December, scientists working at the Large Hadron Collider caught a tantalising glimpse of the Higgs; but they need more data to be sure of its existence. </p><p>Twenty years ago, Tejinder set about building a detector within the Large Hadron Collider that's capable of taking 40 million phenomenally detailed images every second. </p><p>Finding the Higgs will validate everything physicists think they know about the very nature of the universe: not finding it, will force them back to the drawing board. </p><p>By the end of the year, we should know one way or the other.</p>