Color-charge
Draft
analogy with electrical charge
electrical charge -> color charge (sometimes color number)
electromagnetic force -> color force
charged particules -> quarks & gluons
exchange of photon -> exchange of gluons (difference: gluons are also 'color' charged)
description
No physical relation with electromagnetic spectrum, just a name for a three-valued property
Introduced to allow three quarks to coexist and still satisfy the Pauli exclusion principle
-> new quantum state.
color force => force which bind quarks together to forms hadrons, the strong nuclear force => sort of residual of the color force which bind baryons together.
Six kind: 'red, 'green', 'blue' & 'anti-red', 'anti-green' & 'anti-blue'
Hadrons = particules which contains quarks
leptons = doesn't contains quarks, so are always color-neutral
All observed particules are always color neutral.
when interacting, gluons & quarks must change of color resulting must be color neutral
example: quark(red) -> quark(blue) + gluons(red, anti-blue).
=> conservation of color charge
Mathematic of color charge: SU(3)
Only 8 sort of gluons: ...
See also
quarks, gluons, strong interaction & quantum chromodynamics
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