====== Confinement ======

<tabbox Why is it interesting?> 
Quarks and gluons have never been observed freely in nature. Hence, there must be a reason, why they only appear in combination with other particles. The corresponding mechanism is called confinement. 
<tabbox Layman> 

<note tip>
Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party.
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<tabbox Student> 

<blockquote>Renormalizationgroup
arguments yield a large effective coupling
for large quark separation. ' This suggests that
perturbation theory may break down at large distances,
which would explain the lack of perturbative
evidence for confinement. Eliminating ultraviolet
divergences with the artifice of a lattice,
Wilson has investigated the strong-coupling limit
of gauge theories. '
In this limit the theory becomes
one of quarks connected by strings, and
confinement is natural. 

<cite>[[https://journals.aps.org/prd/pdf/10.1103/PhysRevD.16.2978|Topological tunneling and Goldstone gluons]] by Michael Creutz and Thomas N. Tudron</cite></blockquote>

**Recommended Textbook;**

  * An Introduction to the Confinement Problem by J. Greensite
 
<tabbox Researcher> 

<note tip>
The motto in this section is: //the higher the level of abstraction, the better//.
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