- #1

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The UV divergence problems are solved by Renormalization Procedure,but I do not understand how to solve IR divergence problems.

Thank you very much for your kind helping.

- Thread starter ndung200790
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- #1

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The UV divergence problems are solved by Renormalization Procedure,but I do not understand how to solve IR divergence problems.

Thank you very much for your kind helping.

- #2

bhobba

Mentor

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I am no expert in re-normalisation but my understanding is it is solved in the same way - by regularisation, imposing a cutoff, and then taking the limit:

http://www.hep.phys.soton.ac.uk/hepwww/staff/D.Ross/qft/aqft5.pdf [Broken]

Right now I am going a bit deeper into QFT than I have before and this is something I too am trying to grasp. The following paper really helped me a lot by exposing its mathematical underpinnings:

http://arxiv.org/pdf/hep-th/0212049.pdf

Thanks

Bill

http://www.hep.phys.soton.ac.uk/hepwww/staff/D.Ross/qft/aqft5.pdf [Broken]

Right now I am going a bit deeper into QFT than I have before and this is something I too am trying to grasp. The following paper really helped me a lot by exposing its mathematical underpinnings:

http://arxiv.org/pdf/hep-th/0212049.pdf

Thanks

Bill

Last edited by a moderator:

- #3

strangerep

Science Advisor

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If you're talking about QED, the usual textbook procedure is to sum the cross section over all possible configurations with soft photons in the final state. See, e.g., Peskin & Schroeder.Please teach me this:

The UV divergence problems are solved by Renormalization Procedure,but I do not understand how to solve IR divergence problems.

Another approach is to redefine the asymptotic electron states to include soft photon clouds.

BTW, which textbook(s) are you studying from?

- #4

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I am studying Peskin&Schroeder and I am confused with mass singularities in QCD(Parton evolution).

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