Over View of Systematic

The top quark is the third-generation up-type quark with a charge of +(2/3)e.[1] It was discovered in 1995 by the CDF and D0 experiments at Fermilab,[2][3] and is by far the most massive of known elementary particles. Its mass is measured at 172.6±1.4 GeV/c2 , about the same weight as the nuclei of tantalum or tungsten atoms.[4] The top quark interacts primarily by the strong interaction but can only decay through the weak force. It almost exclusively decays to a W boson and a bottom quark. The Standard Model predicts its lifetime to be roughly 1×10−25 s; this is about 20 times shorter than the timescale for strong interactions, and therefore it does not hadronize, giving physicists a unique opportunity to study a "bare" quark.