SciPost Submission Page
Investigating the hadron nature of high-energy photons with PeVatrons
by Giuseppe Di Sciascio
Submission summary
| Authors (as registered SciPost users): | Giuseppe Di Sciascio |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202410_00058v1 (pdf) |
| Date submitted: | 2024-10-28 14:33 |
| Submitted by: | Di Sciascio, Giuseppe |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | 22nd International Symposium on Very High Energy Cosmic Ray Interactions (ISVHECRI 2024) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
In high energy Gamma-Ray Astronomy with shower arrays the most discriminating signature of the photon-induced showers against the background of hadron-induced cosmic-ray is the content of muons in the observed events. In the electromagnetic γ-showers the muon production is mainly due to the photo-production of pions followed by the decay π→μν, with a small relative probability of order α (≃ 1/137). Therefore, the number of muons is typically a few percent of that in a hadron showers where muons are abundantly generated by charged pions decay.\\ In high energy photo-production process the photon exhibits an internal structure which is very similar to that of hadrons. Indeed, photon-hadron interactions can be understood if the physical photon is viewed as a superposition of a bare photon and an accompanying small hadronic component which feels conventional hadronic interactions.\\ Information on photo-production γp and γγ cross-sections are limited to √s≤ 200 GeV from data collected at HERA. Starting from Elab≈100 TeV the difference between different extrapolations of the cross sections increases to more than 50\% at Elab≈1019 eV, with important impact on a number of shower observables and on the selection of the photon-initiated air showers. \\ Recently, the LHAASO experiment opened the PeV-sky to observations detecting 40 PeVatrons in a background-free regime starting from about Elab≈ 100 TeV. This result provides a beam of pure high energy primary photons allowing to measure for the first time the photo-production cross section even at energies not explored yet. The future air shower array SWGO in the Southern Hemisphere, where the existence of Super-Pevatrons emitting photons well above the PeV is expected, could extend the study of the hadron nature of the photons in the PeV region.\\ In this contribution the opportunity for a measurement of the photo-production cross section with air shower arrays is presented and discussed.
Current status:
Reports on this Submission
Strengths
The topic and the content
Weaknesses
English and Plagiarism issues
Report
This article deals with a very relevant topic with a very good scientific level and understanding. However, some actions are required before publication can be recommended. These recommendations are aimed at improving the manuscript according to the rules and quality of the journal.
Requested changes
1) The abstract must fit in 8 lines according to editorial rules. It should be written in a clear and accessible style, emphasizing the context, the problem(s) studied, the methods used, the results obtained, the conclusions reached, and the outlook.
2) In the abstract, this paragraph
"In high energy Gamma-Ray Astronomy with shower arrays the most discriminating signature of the photon-induced showers against the background of hadron-induced cosmic-ray is the content of muons in the observed events. In the electromagnetic γ-showers the muon production is mainly due to the photo-production of pions followed by the decay π → µν, with a small relative probability of order α (≃ 1/137). Therefore, the number of muons is typically a few percent of that in a hadron showers where muons are abundantly generated by charged pions decay."
need to be rephrased due to a high plagiarism detection from the references:
Sciascio, G. D. (2024). Investigating the hadron nature of high-energy photons with PeVatrons. ArXiv (Cornell University). https://doi.org/10.48550/arxiv.2410.22974
and
8th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy (2-6 September 2024) · INDICO - INAF (Indico). https://indico.ict.inaf.it/event/2661/timetable/?view=standard
1) Line 1: The measurement of --> Measuring
2) Line 15: As will be --> As
3) Line 29 to 31: The sentence "... the photon exhibits an internal structure which is very similar to that of hadrons, with a small relative probability of order..." must be rewritten because plagiarism from next reference was detected:
8th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy (September 2-6, 2024) - INDICO - INAF (Indico). https://indico.ict.inaf.it/event/2661/timetable/?view=standard_numbered
4) Figure 1 --> You must cite the figures as a source and give credits. For example: Credit AUTHOR (REFERENCE). Due to editorial rules and copyrights, it is necessary to cite more than just the source (see References). Use typical rules such as "modified by xxx(yyyy)" or "based on xxx (yyyy)" , "Adapted from [reference to original article], "with permission from [copyright holder]", or similar, depending on the context. Also use Creative Commons Attribution 4.0 International (CC-BY-4.0) if applicable. ( https://creativecommons.org/licenses/by/4.0/ )
5) Line 57 --> The sentence "Since the data span an energy range of four orders of magnitude, with the cross sections..."
and
6) Line 70 to 72: The sentence "All factorisation models imply that there is a universal behaviour of the energy dependence, not only at low energy, where one can assume that the hadronic interactions of the photons are those of a vector meson, but also at high energy."
must be rewritten due to plagiarism detection at:
[0812.1065] Total photoproduction cross section at very high energy. https://ar5iv.labs.arxiv.org/html/0812.1065
7) Lines 93 to 94: The sentence "We can explore the effects of the hadronic structure of the photon through the analysis of the total cross sections involving photons." must be rephrased to plagiarism detection at
G. Pancheri(INFN, F. (2015). Photoproduction total cross section and shower development. https://core.ac.uk/download/pdf/35094575.pdf
8) Figure 2 --> The figures must be cited with the source from which the figure originates. Indicate the AUTHOR (REFERENCE) and the reference. Due to the editorial rules and copyrights, not only the source is required (see references)
9) References [8] and [9] are mission in the text. Reference [1] does not follow the format and appears to have two references
10) The English needs to be improved. The reviewer strongly recommends a review and reading by a native English speaker to improve the English. Use active voice in any sentence that focuses on the doer of the action. Many passive voices cloud the meaning of the sentences. The reviewer suggest to try to use the active voice whenever possible
Recommendation
Ask for minor revision