Scale: 10^-18 meters = 1 am = 1 attometer

The Higgs Boson

Physicists have experimentally determined (based on the highest energy particle collisions currently attainable) an upper limit for the size of quarks and electrons: they must be smaller than 10^-18 meters. How much smaller is currently unknown. Superstring theory suggests that these elementary particles could be as small as a Planck length (10^-35 m), or perhaps several powers of ten larger.

In 2012, experiments at CERN observed a new particle with a mass about 125 GeV using a proton-proton collision energy of 8 TeV. Continuing experiments and analysis have concluded that this particle is "consistent with the Higgs boson predicted by the Standard Model." As of 2015, analysis of the Large Hadron Collider (LHC) data indicate that the newly discovered particle is scalar and spin 0, theoretically required attributes of the Higgs boson. A comprehensive discussion can be found on Wikipedia.

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