What does a quark content that is divided by a square root-mean?

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The discussion focuses on the quark content of mesons as presented in the Wikipedia article on mesons. It highlights that the quark content can be represented as a superposition of flavor states, particularly when expressed with a division by the square root of small integers like 2, 3, or 6. This notation indicates the amplitude of each flavor combination, exemplified by the expression ##u\bar u/\sqrt{2}##, which signifies a 50% probability of containing u-quarks.

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I was looking at the Wikipedia article on mesons, which has a table of all the observed particles in which one of the columns is the quark content. For most particles, it is a simple set of 2 quarks, but sometimes is shows a more complicate formula, including division by the square-root of some small number like 2, 3 or 6.

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It's a superposition of the listed contents.
 
Those would be the cases when the meson is a quantum mechanical linear superposition of the flavor states. The numbers represent the amplitude of each flavor combination. For example, if the meson contains ##u\bar u/\sqrt{2}## it has a probability 1/2 to be u-quarks.
 
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