Composition of the 3 Pi-Meson Types

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In summary, a meson is formed by combining a quark and an anti-quark. The pi-meson family consists of only u and d quarks and can have positive, negative, or neutral charges. The positively charged pion is made up of an anti-down quark and an up quark. The neutral pion has a composition of either anti-up and up or anti-down and down, but it is impossible to distinguish between the two. The total quantum-mechanical state includes a combination of both possibilities, resulting in a factor of square root of 2. The negative pion is the opposite of the positive pion.
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EIRE2003
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A quark and an anti - quark combine to form a meson. The pi-meson family is made up of u and d quarks only. A pi-meson can be positively, negatively or neutrally charged.
Give the quark composition of each of the 3 types of pi-meson.

The positively charged pion has a composition of an anti down quark and an up quark.

The neutrally charged pion has a composition of an anti-up quark and an up quark + an anti down quark and a down quark / square root of 2. What does this mean??

What is the composition of the negatively charged pi meson?

Is it these 3 types of mesons it is asking me for the compositions of?
 
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The neutral pi meson is a resonance -- it's either anti-up and up or anti-down and down, and you can't tell the two apart. The total quantum-mechanical state is a combination of both of those possibilitities. That's where the [itex]\sqrt{2}[/itex] comes in.

The negative pion is the "opposite" of the positive pion -- you can figure it out.

- Warren
 
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thank you!
 

1. What are the three types of Pi-mesons?

The three types of Pi-mesons are the charged pion (Pi+ and Pi-), the neutral pion (Pi0), and the strange pion (Pi0s).

2. What is the composition of the charged pion?

The charged pion is composed of an up quark and an anti-down quark.

3. What is the composition of the neutral pion?

The neutral pion is composed of an up quark and an anti-up quark.

4. What is the composition of the strange pion?

The strange pion is composed of a strange quark and an anti-strange quark.

5. How do the different types of Pi-mesons differ in mass?

The charged and neutral pions have nearly identical masses, while the strange pion is slightly heavier due to the heavier strange quark it contains.

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