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A Missing Particle "DO" Collaboration, "A Precision Measurement of the Mass of the Top Quark," Nature, June 10, 2004 (nature.com)
Since the 1960s, physicists have followed the standard model of particle physics, in which the smallest units of matter are a family of tiny particles called quarks and even smaller particles called leptons. Since the top quark (the last of the four predicted) was found in 1995, only one piece has remained in the puzzle of the universe's matter: an elusive lepton called the Higgs Boson.
This particle would drag down the other particles, endowing them with mass. The current theory cannot prove where objects' mass comes from, leaving a gaping hole in our understanding of the physical world.
A $1.4 billion effort at the European research center CERN ended in 2001 without finding the Higgs Boson. The "DO" collaboration (pronounced deezero), a group of ...
Source: HighBeam Research, A missing particle.(Science And Environment)(Brief Article)