On 4 July, the ATLAS and CMS experiments announced the discovery of a new particle. It is probably not just any old new fundamental particle - it is evidence that a scalar field fills the universe and is responsible for the mass of all fundamental particles. I will describe how this was done, why it is important, and say something about what might happen next.
Jon Butterworth is Professor of Physics at University College London. As well as working at CERN, he engages in much outreach activity, including writing a regular blog about physics, and the life of a physicist, on the Guardian website.