The Tevatron is a circular particle accelerator in the United States, at the Fermi National Accelerator Laboratory, just east of Batavia, Illinois, and is the second highest energy particle collider in the world after the Large Hadron Collider (LHC). The Tevatron is a synchrotron that accelerates protons and antiprotons in a 6.28 km (3.90 miles) ring to energies of up to 1 TeV, hence the name. The Tevatron was completed in 1983. On January 10, 2011, it was announced that the Tevatron will cease operations at the end of September, 2011. The main ring of the Tevatron will probably be reused in future experiments, and its components may be transferred to other particle accelerators.

Tevatron atom smasher shuts after more than 25 years   BBC - September 30, 2011
One of the world's most powerful "atom smashers", at the leading edge of scientific discovery for a quarter of a century, has been shut down. The Tevatron dominated the energy physics frontier until the advent of the LHC

Tevatron collider falls silent today after 26 years of smash hits   - September 30, 2011
At 8pm BST today in prairie land just outside Chicago, a feat that is unlikely to be repeated in my lifetime will occur for the last time: man-made collisions of high-energy protons and anti-protons. The final collisions at Fermilab's Tevatron collider bring to an end an odyssey that began in Bob Wilson's (not the Arsenal goalkeeper's) mind as Elvis topped the charts with The Wonder of You; produced its first collisions to the accompaniment of Jennifer Rush warbling about The Power of Love; and discovered the top quark just as Celine Dion was advising the world to Think Twice. The odyssey ends, 26 years after the first collisions, with the dual horror of the Higgs boson potentially being found to be a hoax and a bunch of teenagers who failed to win X Factor topping the charts. I don't know who is more upset: me, Elvis or Peter Higgs.

Higgs boson 'hints' also seen by US lab   BBC - July 24, 2011
A US particle machine has seen possible hints of the Higgs boson, it has emerged, after reports this week of similar glimpses at Europe's Large Hadron Collider (LHC) laboratory. The Higgs boson sub-atomic particle is a missing cornerstone in the accepted theory of particle physics. Researchers have been analyzing data from the Tevatron machine near Chicago. The hints seen at the Tevatron are weaker than those reported at the LHC, but occur in the same "search region".

Physicists Discover New Subatomic Particle   Live Science - July 21, 2011
High-speed collisions at a giant atom smasher have produced what physicists say is a new particle, a heavier relative of the familiar neutron. The particle is called the neutral Xi-sub-b. When it's formed in the Fermilab Tevatron particle accelerator in Batavia, Ill., the neutral Xi-sub-b lasts just a mere instant before decaying into lighter particles. Scientists at Fermilab uncover these ephemeral particles by racing particles around a 4-mile (6.3 km) ring at near light speed. When the particles collide, the outpouring of energy disintegrates them into other particles. Earlier this year, Fermilab scientists thought they'd discovered another never-before-seen particle. That discovery turned out to be a fluke, however.

On April 7, 2011, Fermilab announced the discovery of a possible new particle after a new non-Higgs particle appeared. The discovery currently has a deviation of three standard deviations. However, there is far greater than a 0.3% chance that the discovery is a statistical fluke, because the result was selected after many different experiments. For example, if 3000 experiments were performed, it would be likely that at least one experiment would yield a three-sigma event by chance. For this reason, scientific discoveries generally require five deviation before official confirmation. Some have speculated that the particle was possibly that of the Z' boson or a new unknown particle that could be a fifth force carrier.

US atom smasher may have found new force of nature   PhysOrg - April 6, 2011
Data from a major US atom smasher lab may have revealed a new elementary particle, or potentially a new force of nature, said one of the physicists involved in the discovery. The physics world was abuzz with excitement over the findings, which could offer clues to the persistent riddle of mass and how objects obtain it - one of the most sought-after answers in all of physics. But experts cautioned that more analysis was needed to uncover the true nature of the discovery, which comes as part of an ongoing experiment with proton and antiproton collisions to understand the workings of the universe.

Tevatron    Wikipedia