Up quarks are one of the six flavours of quarks. They are fundimental particles like electrons (and other leptons); which means that they cannot be broken down any further. They have a charge of +2/3 and a baryon number of 1/3. They are the smallest quarks and are the main constiuents of protons and neutrons alongside the down quark.
- ↑ 1.0 1.1 1.2 1.3 HyperPhysics. Quarks. [cited 05/12/2017]. Availiable from: http://hyperphysics.phy-astr.gsu.edu/hbase/Particles/quark.html
- ↑ The New York Times. Fundimental particles. [cited 05/12/2017]. Availiable from: http://topics.nytimes.com/top/news/science/topics/fundamental_particles/index.html