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Could the Higgs boson teach us anything about dark matter? (+video)

If the existence of the Higgs boson is confirmed, it would complete the Standard Model of particle physics. But does that bring us any closer to understanding a mysterious substance thought to account for more than four fifths of the total mass of the universe?

By Denise / July 6, 2012

This track is an example of simulated data modelled for the ATLAS detector on the Large Hadron Collider (LHC) at CERN. The Higgs boson is produced in the collision of two protons and quickly decays into four muons, a type of heavy electron that



The discovery of a new subatomic particle that is likely the elusive Higgs boson — a particle thought to give all other matter its mass — could be an important step toward uncovering the invisible stuff that makes up the majority of the universe, physicists say.

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Fermilab scientist Don Lincoln describes the nature of the Higgs boson. Several large experimental groups are hot on the trail of this elusive subatomic particle which is thought to explain the origins of particle mass

In a much-hyped announcement yesterday (July 4) from the world's largest atom smasher, the Large Hadron Collider in Switzerland, scientists reported evidence of a new "Higgs-like" particle with roughly 125 times the mass of the proton.

The researchers claimed a high level of certainty that the new particle is the long-sought Higgs boson, which is thought to answer how all other matter has mass. The long-sought-after Higgs is the missing link in the reigning theory of particle physics, known as the Standard Model, but finding the Higgs has even wider implications: It opens the door beyond the Standard Model for explaining the existence of dark matter, the mysterious substance widely thought to make up 83 percent of all matter in the universe.

Dark matter has yet to be directly detected; its presence is inferred based on its gravitational pull. Confirming the characteristics of the newly found Higgs-like particle could account for dark matter.

While dark matter is not explained as part of the Standard Model, evidence for the enigmatic substance (based on its gravitational effects) is hard to ignore. This could mean the Standard Model is only part of a wider framework to explain the universe, said Harvey Newman, a professor of physics at the California Institute of Technology. [Top 5 Implications of Finding the Higgs Boson]

"We can't really deny the existence of dark matter," Newman told from the European Organization for Nuclear Research, or CERN, in Geneva. "The Higgs particle that we found doesn't prevent us at all for searching for particles that lie beyond the Standard Model. We still need a candidate for dark matter."

If the newfound particle is consistent with the Standard Model, physicists may be able to use these results to craft a more encompassing picture of the universe.

"You can think of what we found as the key part of the genetic blueprint of the universe," said Maria Spiropulu, another Caltech physics professor of physics, who was in the audience at the July 4 announcement in Switzerland.

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