CERN 'unlikely' to discover new elementary particle
Scientists at CERN have given up their hopes of having discovered a new elementary particle.
Last December, two teams of physicists working at the Large Hadron Collider reported that they may have found traces of what could be a new fundamental constituent of nature.
The physicists said a bump on a graph signalling excess pairs of gamma rays was probably a statistical fluke, but they hoped it was more.
If real, the new particle would have opened a gap between the known and the unknown. In the few months after the announcement over 500 papers were written about the particle.
But at a scientific conference in Chicago, the teams reported that following much more data, the possibility was now unlikely.
The presentations were part of a report on the results so far this year from the collider.
After a rocky start, with an explosion in 2008, it is now running well and producing up to a billion proton-proton collisions a second.
Interview: Fabiola Gianotti, CERN Director-General