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1994: Evidence for the Top Quark is Found

Who : Makoto Kobayashi and Toshihide Maskawa predicted the existence of top quarks in response to charge parity violations in Kaon decay (1973). These particles were confirmed in the Collider Detector at Fermilab in 1995. Properties : Spin ½ particle Color charge Electric charge of 2/3 e

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1994: Evidence for the Top Quark is Found

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  1. Who: • Makoto Kobayashi and Toshihide Maskawa predicted the existence of top quarks in response to charge parity violations in Kaon decay (1973). • These particles were confirmed in the Collider Detector at Fermilab in 1995. • Properties: • Spin ½ particle • Color charge • Electric charge of 2/3 e • Mass: 173±0.52 GeV/c^2 (≈tungsten atom mass) • Mean lifetime of 5x10^-25 seconds 1994: Evidence for the Top Quark is Found Makoto Kobayashi (1944-Present) • Decay statistics: • Bottom quark (99.8%) • Strange quark (0.17%) • Down quark (0.007%) • Why: • It’s short lifetime allows physicists to study “bare quarks” due to the fact it does not hadronize. • Because it’s so massive, the properties of the top quark allowed predictions to be made in regards to the Higgs Boson mass Typical Top Quark Decay: Toshihide Maskawa (1944-Present)

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