Tagparticle physics

New Particle Resembling Long-Sought Higgs Boson Uncovered at Large Hadron Collider

As you’ve likely heard, both the ATLAS and CMS teams at the Large Hadron Collider believe they’ve found the Higgs Boson:

Crucially, both teams’ findings appear exceptionally robust. In physics terms, evidence for a new particle requires a “3-sigma” measurement, corresponding to a 1-in-740 chance that a random fluke could explain the observations, and a claim of discovery requires a 5-sigma effect, or a 1-in–3.5 million shot that the observations are due to chance. In December representatives of the two experiments had announced what one called “intriguing, tantalizing hints” of something brewing in the collider data. But those hints fell short of the 3-sigma level. The new ATLAS finding met not just that level of significance but cleared the gold standard 5-sigma threshold, and CMS very nearly did as well, with a 4.9-sigma finding. […]

The newfound particle fits the bill for the Higgs boson, but the researchers cautioned that more work is needed to compare the properties of the particle to those predicted for the Higgs. After all, the LHC’s detectors cannot identify the Higgs directly. The LHC accelerates protons to unprecedented energies of four trillion electron-volts (4 TeV) before colliding a clockwise-traveling proton beam with a counterclockwise beam. From the smash-up new particles emerge, some of them existing for just an instant before decaying to other particles.

Full Story: Scientific American: New Particle Resembling Long-Sought Higgs Boson Uncovered at Large Hadron Collider

Previously: CERN May Have Found the Higgs Boson Particle, but Don’t Get Too Excited Yet

In Case You Missed It Last Week: LHC Reports Discovery of Its First New Particle

The Chi_b (3P) is a more excited state of Chi particles already seen in previous collision experiments, explained Prof Roger Jones, who works on the Atlas detector at the LHC.

“The new particle is made up of a ‘beauty quark’ and a ‘beauty anti-quark’, which are then bound together,” he told BBC News.

“People have thought this more excited state should exist for years but nobody has managed to see it until now.

“It’s also interesting for what it tells us about the forces that hold the quark and the anti-quark together – the strong nuclear force. And that’s the same force that holds, for instance, the atomic nucleus together with its protons and the neutrons.”

BBC: LHC reports discovery of its first new particle

CERN May Have Found the Higgs Boson Particle, but Don’t Get Too Excited Yet

Jon Butterworth, a member of the High Energy Physics group on the ATLAS experiment at CERN’s Large Hadron Collider confirms that the group thinks it may have found the higgs boson particle. He writes on his blog at The Guardian:

So, it is not a hoax. But the rumours are based on an analysis which has to pass many levels of scientific scrutiny before I get very excited by it. It could fail at any stage. If it passes, it will be released by ATLAS, and will then be submitted to a journal. For comparison, journal submission acceptance is the stage the CDF bump has got to, and that is far from established yet as a real new physics effect.

The thing is, CERN is an exciting place right now. New data are coming in as I write. There are lots of levels of collaboration and competition. Retaining a detached scientific approach is sometimes difficult. And if we can’t always keep clear heads ourselves, it’s not surprising people outside get excited too. This is why we have internal scrutiny, separate teams working on the same analysis, external peer review, repeat experiments, and so on…

So don’t go tearing up your particle physics text books just yet. But please stay tuned for when we really do have something to say! These are indeed interesting times.

The Guardian: Rumours of the Higgs at ATLAS

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