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Scientists believe they have captured the elusive “God particle” that gives matter mass and holds the physical fabric of the universe together.

The historic announcement came in a progress report from the Large Hadron Collider particle accelerator.

Professor John Womersley. chief executive of the Science and technology Facilities Council, told reporters at a briefing in London: “They have discovered a particle consistent with the Higgs boson.

“Discovery is the important word. That is confirmed. It’s a momentous day for science.”

Scientists say it is a 5 sigma result which means they are 99.999% sure they have found a new particle.

Finding the Higgs plugs a gaping hole in the Standard Model, the theory that describes all the particles, forces and interactions that make up the universe.

If the particle was shown not to exist, it would have meant tearing up the Standard Model and going back to the drawing board.

CMS Detector at the Large Hadron Collider at CERN, near Geneva

The Cern laboratory appeared to have let slip its biggest breakthrough in a generation after appearing to announce the discovery of a new particle in an online video overnight.

In the short film accidentally published by the lab yesterday spokesman Joe Incandela is seen describing how physicists at the Large Hadron Collider had “observed a new particle”.

Today scientists gathered in Geneva to announce the findings. Among the audience was Peter Higgs, the Edinburgh professor who first proposed the existence of the mysterious particle almost 50 years ago.

Rumours had been rife that scientists hunting the Higgs were to announce today’s finding but the video appeared to confirm the finding of a particle matching its description hours before it was confirmed.

It was first theorised in the 1960s by Edinburgh-based physicist Peter Higgs, amongst others, and is credited for giving all other particles mass. But until now, it has proved impossible to pin down (AFP/Getty Images)

Although their results are said to be strong enough to claim an official discovery, the scientists will avoid doing so because they remain unsure whether the particle they have found is indeed the Higgs.

Cern spokesman James Gillies said the video was one of several filmed to cover every eventuality and did not directly relate to today’s announcement.

The Internet has been rife with rumours of a discovery ever since CERN, the European nuclear research facility, announced it would hold a press conference today with the leaders of its two gigantic experiments, ATLAS and CMS.

Sources have told the Telegraph that ATLAS will today announce a 5-sigma signal and CMS will announce a 4.9-sigma signal of a new particle with a mass of 126.5 GigaelectronVolts (GeV) and 125.2 GeV respectively – a result which falls slap bang in the middle of the tough-to-explore region where many physicists were adamant the Higgs was hiding.

The results being announced today definitively point to a new particle or particles which fit the description of a Higgs Boson, but further research will be needed to characterise it properly.

The Higgs boson is the final piece of the Standard Model of Particle Physics, a theoretical model which describes the fundamental particles and forces that control our Universe.

It was first theorised in the 1960s by Edinburgh-based physicist Peter Higgs, amongst others, and is credited for giving all other particles mass. But until now, it has proved impossible to pin down.

To do so, scientists use the LHC to smash together protons at almost the speed of light and scour the debris for traces of particles that sprang into existence for just a fraction of a second before disintegrating.

Sources have told the Telegraph that ATLAS will today announce a 5-sigma signal and CMS will announce a 4.9-sigma signal of a new particle with a mass which matches many physicists’ idea of a Higgs Boson.

An ATLAS researcher said there was “no question” the two detectors are seeing the same thing, adding: “A lot of bets are going to be settled up [today]”.

“After so many years preparing and searching, it’s really amazing to see a clear signal emerge,” a CMS Higgs physicist added.

“This is the sort of thing that makes me cry,” said an ATLAS Higgs physicist. “It’s the kind of crying that accompanies winning something or being overwhelmed with happiness. Human thought and ingenuity have continually created and discovered, but this outdoes them all.”


All the latest developments from Cern, home of the Large Hadron Collider, as scientists gather for a major announcement.

Two teams of physicists at the Cern laboratory near Geneva are preparing today to announce their latest efforts to discover the Higgs boson.

The elusive “God particle” has become the most sought-after particle in modern science. Its discovery would be proof of an invisible energy field that fills the vacuum of space, and excitement in the scientific community is at fever pitch.

Peter Higgs, the Edinburgh University physicist who proposed the idea of the particle in 1964, is flying in to Geneva, as are two other men who published similar theories at around the same time: François Englert, professor emeritus at the Free University of Brussels (ULB) in Belgium, and Tom Kibble, professor emeritus at Imperial College London.

The Large Hadron Collider at Cern, near Geneva. Scientists there are making an announcement this morning, thought to be about the possible discovery of the Higgs boson particle. Photograph: Martial Trezzini/AP

There have been rumours, speculation, and, last night, even an apparent leak from the laboratory when a video announcing the discovery of a new particle was accidentally posted on its website.

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