If it looks like a Higgs boson and acts like a Higgs boson, it very well might be a Higgs boson.
And that's big news in the physics field, and more great news for Fermi National Accelerator Laboratory in Batavia.
Scientists say a new particle discovered at experiments at the Large Hadron Collider last summer is looking more like a Higgs boson than ever before, according to results announced Thursday, March 14, at the Rencontres de Moriond conference in La Thuile, Italy
In July, physicists on the CMS and ATLAS experiments announced the discovery of a particle with a close resemblance to a Higgs, a particle thought to give mass to other elementary particles. The discovery of such a particle could finish a job almost five decades in the making: It could confirm the last remaining piece of the Standard Model of particle physics, a menu of the smallest particles and forces that make up the universe and how they interact.
“Clear evidence that the new particle is the Standard Model Higgs boson still would not complete our understanding of the universe,” said Patty McBride, head of the CMS Center at Fermilab. “We still wouldn’t understand why gravity is so weak and we would have the mysteries of dark matter to confront. But it is satisfying to come a step closer to validating a 48-year-old theory.”
Researchers look for the Higgs boson at the LHC by accelerating protons to high energies and crashing them into one another. The energy of those colliding protons can briefly convert into mass, bringing into being heavier particles such as the Higgs bosons. The heavy particles are unstable and decay almost immediately into pairs of less-massive particles.
Scientists have specific predictions for how often a Standard Model Higgs boson of a certain mass will decay into different patterns of particles. The latest results indicate that the new particle is sticking to the Standard Model’s script.
The ATLAS and CMS collaborations have analyzed two and a half times more data than was available for the discovery announcement in July, and, in their preliminary results, they find that the new particle is looking more and more like a Higgs boson.
“When we discovered the particle, we knew we found something significant,” ATLAS scientist and New York University professor Kyle Cranmer said. “Now, we’re just trying to establish the properties.”
The analysis included the data from about 500 trillion proton-proton collisions collected in 2011 and from about 1,500 trillion collisions in 2012. The LHC stopped operation on Feb. 16, for two years of maintenance and upgrades, but researchers will continue to study the data collected before the shutdown.
Hundreds of scientists and students from American institutions have played important roles in the search for the Higgs at the LHC. Fermi National Accelerator Laboratory and Brookhaven National Laboratory host the U.S. contingents of the CMS and ATLAS experiments, respectively.
The vast majority of U.S. scientists participate in the LHC experiments from their home institutions, remotely accessing and analyzing the data through high-capacity networks and grid computing. Working collaboratively, these international organizations are able to analyze an incredible amount of data.
After further analysis, scientists will be able to say whether this new particle is the Standard Model Higgs boson or something more surprising.
Information about the US participation in the LHC is available at http://www.uslhc.us . Follow US LHC on Twitter at http://twitter.com/uslhc.
Fermilab is America's premier national laboratory for particle physics research. A U.S. Department of Energy Office of Science laboratory, Fermilab is located near Chicago, Illinois and operated under contract by the Fermi Research Alliance, LLC. Visit Fermilab's website athttp://www.fnal.gov and follow us on Twitter at @FermilabToday.
SOURCE: Fermi National Accelerator press release
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