Physics, asked by Anonymous, 6 months ago

Explain the thermal spectral function with example!

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Answer:

stable particles correspond to isolated poles on the real axis, while unstable particles correspond to poles off the real axis. In the spectral function the peaks of stable particles are δδ-functions, while the peaks of unstable particles have a finite width, equal to their decay width. The last point can easily be prove by the optical theorem, see e.g. Peskin P236-237.

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Answered by Anonymous

I really hope this will help you Nikhil

Take care...

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Explain the thermal spectral function with example!

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