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===Discoveries by Fermilab experiments=== The following particles were first directly observed at Fermilab: [[File:Fermilab - CDF detector rolling in for run 2.jpg|thumb|Fermilab's CDF detector]] * The [[top quark]]<ref>{{cite news |last1=Johnson |first1=George |title=Physicists Weigh In: The Quark Is a Porker |url=https://www.nytimes.com/1995/03/05/weekinreview/feb.26-march-4-physicists-weigh-in-the-quark-is-a-porker.html |access-date=April 30, 2022 |work=New York Times |date=March 5, 1995}}</ref> announced in 1995 by the [[DΓ experiment]] and [[CDF experiment]]. * The [[bottom quark]], which was observed as a quark-antiquark pair called the [[Upsilon meson]]<ref>{{Cite web |url=https://history.fnal.gov/historical/experiments/botqrk.html |series=Fermilab History and Archives Project |title=Discovery of the bottom quark, Upsilon |website=history.fnal.gov |access-date=July 10, 2021 }}</ref> announced in 1977 by Experiment 228. * The [[tau neutrino]], announced in July 2000 by the [[DONUT]] collaboration.<ref>{{cite news |last1=Jackson |first1=Judy |title=Physicists Find First Direct Evidence for Tau Neutrino at Fermilab |url=https://news.fnal.gov/2000/07/physicists-find-first-direct-evidence-tau-neutrino-fermilab/ |access-date=April 30, 2022 |publisher=Fermilab News |date=July 20, 2000}}</ref> * The [[omega baryon|bottom Omega baryon]] ({{SubatomicParticle|Bottom Omega-}}), announced by the [[DΓ experiment]] of Fermilab in 2008.<ref>{{cite news |publisher=Fermilab |date=September 9, 2008 |title=Fermilab physicists discover "doubly strange" particle |url=http://www.fnal.gov/pub/presspass/press_releases/Dzero_Omega-sub-b.html |url-status=live |archive-url=https://web.archive.org/web/20080905221150/http://www.fnal.gov/pub/presspass/press_releases/Dzero_Omega-sub-b.html |archive-date=September 5, 2008}}</ref> In 1999, physicists at on the KTeV experiment were also the first to observe [[CP violation#CP violation in the Standard Model|direct CP violation]] in [[kaon]] decays.<ref>{{cite news |last1=O'Boyle |first1=LuAnne |title=Fermilab Physicists Find New Matter-Antimatter Asymmetry |url=https://news.fnal.gov/1999/03/fermilab-physicists-find-new-matter-antimatter-asymmetry/ |access-date=April 30, 2022 |publisher=Fermilab News |date=March 1, 1999}}</ref> The [[DΓ experiment]] and [[CDF experiment]] each made important contributions to the observation of the [[Higgs Boson]], announced in 2012.<ref>{{cite news |last1=Kurt |first1=Reisselmann |title=Tevatron scientists announce their final results on the Higgs particle |url=https://news.fnal.gov/2012/07/tevatron-scientists-announce-final-results-higgs-particle/ |access-date=April 30, 2022 |publisher=Fermilab News |date=July 2, 2012}}</ref>
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