Professor Higgs wipes a tear from his eye as fellow scientists find his 'God particle' on 'momentous day for science' - 40 years after he predicted its existence

• Discovery of particle is most important in physics in decades
• Leading physicists watch announcement at CERN in Switzerland
• End of 40-year quest for 'missing' particle
• Last jigsaw piece that proves our view of universe is right
• 'God Particle' gives particles that make up atoms their mass
• Prof Higgs, 83: 'I had no idea this would happen in my lifetime'

By Rob Waugh
PUBLISHED: 08:17, 4 July 2012 | UPDATED: 18:04, 4 July 2012

The hunt for the Higgs boson - the ‘God particle’ that holds the universe together - is over.
Scientists at Switzerland's CERN (the European Council for Nuclear Research) announced the discovery to an audience including Professor Peter Higgs, who first suggested the existence of the particle in 1964 after he dreamed up the idea while walking in the Highlands.
Professor Higgs, 83, wiped a tear from his eye as the findings were announced, and later said: 'It's really an incredible thing that it's happened in my lifetime.'
An audience of the world's leading physicists rose in a standing ovation to celebrate the find - the culmination of a decades-long search at the Large Hadron Collider and other particle accelerators such as America's Tevatron.
The discovery is the biggest leap in physics for decades - filling in a crucial gap in our understanding of the atom. In the long term, the discovery could lead to new technologies.

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Professor Higgs, 83, wiped a tear from his eye as the findings were announced, and later said: 'It's really an incredible thing that it's happened in my lifetime.'

Two high-energy photons collide. Their energy (the red lines) is measured in by an 'electromagnetic calorimeter'. The yellow lines are the measured tracks of other particles produced in the collision. The pale blue volume shows the track through which the particles are sent

Joe Incandela, spokesperson of the CMS experiment, announces the discovery of a particle that corresponds to theories of the Higgs boson at CERN today

The particle accelerator: It is within these tubes that physicists are hunting for the 'God' particle

WHY THE HIGGS MATTERS - WHAT THE NEW PARTICLE MEANS

The Higgs was proposed in 1964 - it is the last missing piece of the Standard Model, the theory that describes the basic building blocks of the universe. The other 11 particles predicted by the model have been found - the Higgs is the last jigsaw piece.

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

Theory has it that as the universe cooled after the Big Bang, an invisible force known as the Higgs field formed.

This field permeates the cosmos and is made up of countless numbers of tiny particles – or Higgs bosons.As other particles pass through it, they pick up mass.

Any benefits in the wider world from the discovery of the Higgs boson will be long term, but they could be in fields as diverse as medicine, computing and manufacturing.

Experts compare the search for the Higgs boson to the discovery of the electron.

The idea of the electron – a subatomic particle – was first floated in 1838, but its presence was not confirmed for another 60 years.

A century on, the electron’s existence underpins modern science. Our understanding of it is critical to the development of technology from television and CDs to radiotherapy for cancer patients.

Professor John Womersley. chief executive of the Science and technology Facilities Council, said: '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.'
'This is indeed a new particle,' said lab spokesman Joe Incandela.
'This is something that may in the end be one of the biggest discoveries or observations of any new phenomena that we’ve had in our field in the last 30 or 40 years,' said Incandela.
The discovery fills in the last gap in the 'standard model' of physics - proving Einstein right, and possibly leading to new technologies built on our understanding of the workings of the atom.
In December last year scientists at the Large Hadron Collider (LHC) - the ‘Big Bang’ particle accelerator which recreates conditions a billionth of a second after the birth of the universe - revealed they had caught a first tantalising glimpse of the Higgs.
Since then they have sifted through vast quantities of data from innumerable high energy collisions in an effort to reduce the odds of being wrong.

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A statistical standard of proof known as ‘five sigma’ is the ultimate confirmation of a discovery.
‘We observe in our data clear signs of a new particle, at the level of 5 sigma,’ said ATLAS experiment spokesperson Fabiola Gianotti, ‘but a little more time is needed to prepare these results for publication.’
‘The results are preliminary but the 5 sigma signal at around 125 GeV we’re seeing is dramatic. This is indeed a new particle. We know it must be a boson and it’s the heaviest boson ever found,’ said CMS experiment spokesperson Joe Incandela.
‘The implications are very significant and it is precisely for this reason that we must be extremely diligent in all of our studies and cross-checks.’
‘It’s hard not to get excited by these results,’ said CERN Research Director Sergio Bertolucci. ‘ We stated last year that in 2012 we would either find a new Higgs-like particle or exclude the existence of the Standard Model Higgs. With all the necessary caution, it looks to me that we are at a branching point.’
Prof Higgs, who first postulated the theory more than 40 years ago, told the BBC: 'I'm rather surprised that it happened in my lifetime - I certainly had no idea it would happen in my lifetime at the beginning, more than 40 years ago, because at the beginning people had no idea about where to look for it, so it's really amazing for me to find out that it's really enough... for a discovery claim.
'I think it shows amazing dedication by the young people involved with these colossal collaborations to persist in this way, on what is a really a very difficult task. I congratulate them.'

MASTER OF THE UNIVERSE: THE QUIET MAN WHO DREAMT UP THE 'GOD PARTICLE' WHILE WALKING IN THE HIGHLANDS

Peter Higgs in the Sixties. The scientist dreamed up the idea of the Higgs boson while walking in the Cairngorms in 1964

Until recently, Professor Peter Higgs was as unknown to most of the world as the famous particle that bears his name.
Today the quiet physicist, now retired from the University of Edinburgh, is fast becoming a global celebrity as creator of the theory behind the ‘God particle’.
Prof Higgs, 83, has been waiting since 1964 for science to catch up with his ideas about the Higgs boson.
It was in that year he dreamed up the concept in a moment of inspiration while walking in the Cairngorms.
Two scientific papers followed, the second of which was initially rejected and then finally published in the respected journal Physical Review Letters.
Prof Higgs's groundbreaking proposal was that particles acquire mass by interacting with an all-pervading field spread throughout the universe. The more they interact, the more massive and heavy they become.
A ‘boson’ particle was needed to carry and transmit the effect of the field - the Higgs boson.
Peter Higgs was born in Newcastle in 1929, the son of a BBC sound engineer.
After his family moved to Bristol, he proved a brilliant pupil at Cotham Grammar School before going on to read theoretical physics at King's College London.
He was awarded first class honours in 1950, and after failing to secure a lectureship at King's College, set off for Scotland. In 2006, he retired from the University of Edinburgh, assuming the title of emeritus professor.
Never one to blow his own trumpet, Prof Higgs is described by friends and colleagues as ‘very unassuming’ and shy. Some believe his retiring nature might even have held back his career. Now, despite his best efforts to keep a low profile, the spotlight is turning on him.

British physicist Peter Higgs (right) is welcomed by European Organization for Nuclear Research (CERN) director-general Rolf-Dieter Heuer (left)

British physicist Peter Higgs arrives for the conference near Geneva

Inside: The giant project is the most enormous piece of scientific apparatus ever constructed, and is buried 100m beneath the ground

An aerial view of the Swiss-French border, indicating the route of the Large Hadron Collider

THE 'GOD PARTICLE' - WHY THE HIGGS HUNT CAUSED CONTROVERSY

The search for the particle caused controversy as members of the public feared that the high-energy collisions could cause a black hole or an interdimensional gateway in Switzerland.
Religious groups also objected to the use of the term 'God particle' - although CERN's scientists dislike the term just as much.
Nobel prize-winning physicist Leon Lederman nicknamed the boson the 'God particle' in 1993 - which makes it popular in the media but has angered many scientists, including Professor Higgs himself.

At the LHC, scientists shoot two beams of protons - the ‘hearts’ of atoms - at each other round 27 kilometres of circular tunnels at almost the speed of light.
When the protons smash together the enormous energies involved cause them to decay into an array of more fundamental particles. These may then decay further into yet more particles.
Physicists needed the Higgs to plug a gaping hole in the ‘Standard Model’, the theory that explains all the particles, forces and interactions making up the universe.
So far nothing has been observed to account for mass, and the fact that some particles weigh more than others.
According to the theory, the Higgs boson is the emissary of an all-pervading ‘Higgs field’ that gives matter mass. The more particles interact with the field, the more massive they become and the heavier they are.

A model of the Large Hadron Collider (LHC) tunnel is seen in the CERN (European Organization For Nuclear Research) visitors' center

A Standard Model universe without the Higgs boson could not exist. Everything would behave as light does, floating freely and not combining with anything else. There would be no atoms, made from conglomerations of protons, neutrons and electrons, no ordinary matter, and no us.
Finding no evidence of the Higgs would mean tearing up the Standard Model and going back to the drawing board with a completely new set of theories.'

BRITISH SCIENTISTS CONGRATULATE THE CERN TEAM

 'For physicists, this is the equivalent of Columbus discovering America.'

- Prof Themis Bowcock, University of Liverpool

British experts queued to heap praise on the discovery of a new sub-atomic particle bearing the hallmarks of the Higgs boson.
Professor Valentin Khoze, director of Durham University's Institute for Particle Physics Phenomenology (IPPP), said: 'The mounting evidence that Higgs bosons have been produced and detected at the Large Hadron Collider experiment at Cern is a triumph for particle physics.
'Without the Higgs particle, other particles, such as electrons and quarks, would be massless and the Universe would not be what it is.
'Now, with the amazing results from the LHC, we are finally finding growing experimental evidence that the Higgs really exists.
'The second part of the story about the Higgs particle is even more exciting as it provides us with a window to new physics - a tool for the exploration of the truly unknown.'
Professor Jordan Nash, head of high energy physics at Imperial College London, said: 'This is a fantastic result.
'We are all thrilled to be a part of this discovery and are looking forward with anticipation to studying this new particle and whatever surprises its behaviour may have in store for us.'
Professor Jerome Gauntlett, head of theoretical physics at Imperial College London, said: 'The discovery of the Higgs boson is a truly great moment for science.
'Its origins go back to the 1960s with enormous contributions made by Peter Higgs in Edinburgh and by Tom Kibble and Nobel Laureate Abdus Salam at Imperial.
'It is fantastic moment for British science that 50 years later on we have received such dramatic confirmation of their profound ideas. Like all great discoveries, more detailed studies of the Higgs are likely to have a huge impact on future fundamental scientific inquiry.
'I expect that they will illuminate the nature of the mysterious Dark Matter that pervades the universe, whether or not there are extra dimensions in addition to the three space dimensions that we observe, and ultimately how to unify the Standard Model of Particle Physics with Einstein's Theory of Gravity.'