Understanding Neutral Pions: Superpositions, Particles, & Feynman Diagrams

In summary, a neutral pion is a particle that is a superposition of u\bar{u} and d\bar{d} states. It can be understood as a single particle despite its composition due to its decay products in scattering. Feynman diagrams can be used to depict processes involving neutral pions, such as their decay into two photons through the anomaly in divergence of axial vector current. Examples of these diagrams can be found online.
  • #1
dEdt
288
2
So apparently a neutral pion is a superposition of [itex]u\bar{u}[/itex] and [itex]d\bar{d}[/itex]. I'm having trouble understanding what this means. I have no problem understanding how the decay products of some scattering experiment could be a superposition of these two states, but how can we treat this superposition as a single particle? And how would you draw the feynman diagram for some process involving a neutral pion?
 
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  • #2
The neutral pions are decay products from scattering.
There are plenty of examples online of Feynman diagrams involving pions.
 
  • #3
the decay of neutral pions into two photons happens through the anomaly in divergence of axial vector current.the decay has a triangle diagram.
http://prola.aps.org/abstract/PR/v177/i5/p2426_1
it is available freely here.
http://astrophysics.fic.uni.lodz.pl/100yrs/pdf/12/068.pdf
 

1. What is a neutral pion?

A neutral pion is a subatomic particle that is composed of a quark and an anti-quark. It is classified as a meson and has a spin of zero, making it a boson. It is electrically neutral, meaning it has no charge.

2. How do neutral pions exhibit superposition?

Neutral pions exhibit superposition by existing in a quantum state where they can have multiple different properties, such as position and momentum, simultaneously. This is a fundamental characteristic of quantum mechanics and is essential for understanding the behavior of neutral pions.

3. What is the significance of neutral pions in particle physics?

Neutral pions play a crucial role in understanding the strong nuclear force, one of the four fundamental forces in nature. They are also important in understanding the properties of other particles, such as protons and neutrons, and in studying the structure of matter.

4. What are Feynman diagrams and how do they relate to neutral pions?

Feynman diagrams are graphical representations of mathematical equations that describe the behavior and interactions of particles. They are frequently used in particle physics to visualize and calculate the probability of various particle interactions, including those involving neutral pions.

5. How are neutral pions produced and detected in experiments?

Neutral pions are produced in high-energy collisions, such as those in particle accelerators, when high-energy particles interact and create new particles. They are detected by observing the decay products of the neutral pions, which typically produce photons that can be detected by specialized detectors.

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