![quark color quark color](http://3.bp.blogspot.com/-PCJ1XFQpRX0/VaecImPBnMI/AAAAAAAACXM/d6reHI2GAco/s1600/QuarksAntiquarks.png)
However the spin 1/2 of the quarks was not included in the model. The group SU(3) flavor, acting on these three flavors, gave an approximate symmetry that led to mass formulas for the hadrons constructed with these quarks. In the modified Bonn quark model in which quark-pairing and particle-hole interactions are included, color-singlet states are examined in addition. Three “flavors” of quarks, up, down, and strange, were known at that time. However quarks were paradoxical in that they had fractional values of their electric charges, but no such fractionally charged particles had been observed. Quarks gave a simple way to account for the ► quantum numbers of the hadrons.
![quark color quark color](http://www.jicfus.jp/en/wp-content/uploads/2012/12/colors.gif)
When quarks are brought together to produce color singlets, these infinite color fields cancel. In 1964 Murray Gell-Mann and George Zweig independently proposed what are now called “quarks,” particles that are constituents of the observed strongly interacting particles, “hadrons,” such as protons and neutrons. The color charge of the quark is enhanced by the charged virtual particles and increases without bound as we move away from it. The theoretical and experimental background to the discovery of color centers around events in 1964. The word “color” in this context is purely colloquial and has no connection with the the color that we see with our eyes in everyday life. The union of the two contains the essential ingredients of ► Quantum Chromodynamics, QCD. Color as a gauge symmetry was introduced by Yoichiro Nambu and by Moo Young Han and Yoichiro Nambu in 1965. Color as a three-valued charge degree of freedom was introduced by Oscar W.
![quark color quark color](https://blogs-images.forbes.com/startswithabang/files/2017/08/1-jTtmoTiIq5zlHOcaQGqHhQ.gif)
Just as a mix of red, green, and blue light yields white light, in a baryon a combination of 'red,' 'green,' and 'blue' color charges is color neutral, and in an antibaryon 'antired,' 'antigreen,' and 'antiblue' is also color neutral. The other is as a ► gauge symmetry, analogous to the U(1) gauge theory of electromagnetism. Each quark has one of the three color charges and each antiquark has one of the three anticolor charges. One is as a three-valued charge degree of freedom, analogous to electric charge as a degree of freedom in electromagnetism. Color has two facets in ► particle physics.