SciPost Submission Page
Aspects of High Energy Scattering
by Chris D. White
Submission summary
| Authors (as registered SciPost users): | Chris White |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/1909.05177v2 (pdf) |
| Date accepted: | Jan. 23, 2020 |
| Date submitted: | Jan. 17, 2020, 1 a.m. |
| Submitted by: | Chris White |
| Submitted to: | SciPost Physics Lecture Notes |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Theoretical |
Abstract
Scattering amplitudes in quantum field theories are of widespread interest, due to a large number of theoretical and phenomenological applications. Much is known about the possible behaviour of amplitudes, that is independent of the details of the underlying theory. This knowledge is often neglected in modern QFT courses, and the aim of these notes - aimed at graduate students - is to redress this. We review the possible singularities that amplitudes can have, before examining the generic behaviour that can arise in the high-energy limit. Finally, we illustrate the results using examples from QCD and gravity.
Author comments upon resubmission
I am writing to resubmit my lecture notes, following minor revisions at the request of both anonymous referees. My responses to each of them are attached below.
Kind Regards,
Chris White
List of changes
Response to Report 1:
I thank the referee for their comments, and have made all the requested minor changes for resubmission.
Response to Report 2:
I thank the referee for their careful reading, and very helpful suggestions on how to improve the article. A summary of my changes is as follows:
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I added a reference to Veltman's book in section 2.
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I have rephrased the discussion of cluster decomposition to remove this confusion.
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I have added a discussion at the end of section 2.2 to discuss the assumption of a mass gap.
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I have clarified the notation in the caption of figure 3, choosing to keep letters for particle species, and numbers for 4-momenta. One reason is that this notation agrees with recent literature on scattering amplitudes.
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The referee is strictly speaking correct, although much of the literature on the Regge limit (including recent studies) uses the terms "high energy" and "Regge" interchangeably. I have added a clarifying footnote on p. 19, and hope this does the trick.
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Please see point 5.
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The referee is correct about this limitation, which arose due to the finite length of the lecture notes. I have now added a comment to address this to the final paragraph of the conclusion, with references.
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I have implemented the referee's suggestion.
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I have added a new introduction to section 4 in line with the referee's suggestions. Furthermore, I added a clarifying remark at the end of the first paragraph on p. 30.
Published as SciPost Phys. Lect. Notes 13 (2020)