CERN: LHC Data Confirms Particle is "God Particle", But the Devil is in the Details
March 14, 2013 1:40 PM
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The LHC is the single most expensive piece of scientific equipment in the history of mankind.
Scientists are still grappling with whether Standard Model of particle physics still applies
It took the construction of the
most expensive piece of laboratory equipment
in the history of mankind (with a sticker price of $10B USD), but last July the
European Organization for Nuclear Research
(CERN) reported that it was 99.99997% sure that it had found the Higgs boson -- an incredibly elusive yet critical subatomic particle that creative members of the media dubbed "the God Particle".
I. After Analyzing More Data, CERN is More Certain it Saw a Higgs Boson
The results from
the Large Hadron Collider
(LHC) validated an earlier
99.8 percent (roughly 3σ) sure
spotting by the
U.S. Department of Energy
Now researchers have
the certainty even higher. Researchers with CERN have combed through two and a half times more data since last July, examining the results from the
. Among the things measured were the interactions between the particles created, the parity of the created particles, and their spin.
The Higgs boson in most models is expected to have no spin. Likewise, the new mystery particle observed in
record 7 TeV and 8 TeV proton collisions
had no spin. CMS spokesperson Joe Incandela comments, "The preliminary results with the full 2012 data set are magnificent and to me it is clear that we are dealing with a Higgs boson though we still have a long way to go to know what kind of Higgs boson it is."
As Mr. Incadela suggests, the bigger question was whether this was the Higgs boson predicted by the prevailing theory of particle physics -- the Standard Model -- or whether the evidence pointed to an alternate theory. As they say, the devil is in the details.
II. But What Kind?
When it came to the "God particle" those details point to the Standard Model being correct. The Standard Model predicts a positive parity, and likewise the detectors indicated the mystery particle to have a positive parity.
Comments ATLAS spokesperson Dave Charlton, "The beautiful new results represent a huge effort by many dedicated people. They point to the new particle having the spin-parity of a Higgs boson as in the Standard Model. We are now well started on the measurement programme in the Higgs sector."
A CMS detector view of a Higgs boson creation from a 8 TeV collision. [Image Source: CERN]
In a sense, there's no right or wrong answer when it comes to the identity of the Higgs boson -- only the quest for the truth. The LHC has previously provided evidence that
some aspects of supersymmetry theory are flawed
and need to be reworked. By contrast the Higgs boson parity results appear to confirm the prevalent theory.
An ATLAS detector view of a Higgs boson creation from a 8 TeV collision.
[Image Source: CERN]
With the parity certain, the last piece of evidence that researchers need to determine that it's the Standard Model Higgs boson is to make sure its observed decays match those predicted by the Standard Model. To do that, the researchers will have to log more high power tests with the LHC. The Higgs boson is only created once every trillion (10
) proton-proton collisions, or so. As it can presumably decay in many ways, scientists will need to create more Higgs boson and observe their decays in order to fully verify that the Standard Model holds true.
Finding the Higgs boson is a major step on the road to discovering the secrets of the universe.
[Image Source: NASA]
For now researchers are very sure they found the Higgs boson, but only "pretty sure" that the critical Standard Model theory is correct.
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Why a picture of the Tevatron which is at Fermilab?
3/15/2013 5:07:16 AM
While an aerial view of the Tevatron at Fermilab located just outside Batavia, Illinois, near Chicago is nice perhaps a picture of the LHC at CERN near Geneva, Switzerland might be more appropriate for the story and the caption.
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