Meet an alien from another planet

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    Alien Planet
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SUMMARY

To determine if an alien is composed of antimatter without physical contact, one must analyze the rates of CP-violated processes. CP symmetry indicates that particles and their antiparticles should behave identically; thus, any observed differences in reaction rates would suggest the presence of antimatter. This method is theoretically sound but may not be practical in real-world scenarios. For further understanding, refer to Richard Feynman's lectures on Physics, specifically Volume One, pages 52-10 to 52-11.

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Soff
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Suppose you are going to meet an alien from another planet. How can you make sure that the alien is not build of antimatter without touching it?

My teacher told me that I have to compare the rate of the C-P violated processes. I didn't understand this point.
 
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Throw something at him ;)
 
if CP is a good symmetry between particles and anti-particles, then CP violation means that reaction rates between set of particles will be different from those rates generated by a set of anti-particles. so by observing the rate of CP violating processes generated by these aliens you can tell (in principle, not sure this is practical) whether they are made of anti-matter.
 
Your teacher was referring to a joke that Feynman had in his famous lectures. Go to the library and look up Feynman's lectures on Physics Volume one pages 52-10 to 52-11.
 

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