Chase continues for a lighter Higgs: latest estimates narrow target for mass of elusive particle.
To fit with the standard model of particle physics, the Higgs must now be lighter than 145 billion electron volts, or GeV, team members from LHC's ATLAS and CMS experiments reported August 22 in Mumbai, India, at the International Symposium on Lepton Photon Interactions at High Energies.
This new limit goes beyond previous results from the Tevatron at the Fermi National Accelerator Laboratory in Batavia, Ill.--which directly excluded 156 to 177 GeV by looking for debris left behind when the Higgs breaks down, and indirectly ruled out masses above 185 GeV.
"We've now confirmed with direct searches that the mass of standard model Higgs, if it exists, is light," says CERN's Fabiola Gianotti, a spokeswoman for ATLAS.
As it runs out of room to hide, the Higgs is still playing hard to get. Faint hints of the Higgs seen at the LHC in July--particles with energies in line with a lighter Higgs--have grown fainter in the new LHC data. Still, CERN physicists expect to discover or rule out the existence of the Higgs in the next two years.
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|Title Annotation:||Atom & Cosmos; Higgs boson|
|Article Type:||Brief article|
|Date:||Oct 8, 2011|
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