The phrase "top quark" refers to a tiny fundamental particle that is one of the building blocks of matter. It is the heaviest known quark and plays a crucial role in understanding the structure of atoms and the universe. Full definition
The CDF and DZero experiments first observed particle collisions that created single top quarks through a different process of the weak nuclear force in 2009. (sciencedaily.com)
This diagram shows the process for creating single top quarks through the s - channel. (sciencedaily.com)
They identified about 40 particle collisions in which the weak nuclear force produced single top quarks in conjunction with single bottom quarks. (sciencedaily.com)