SciPost Submission Page
Photon production in top quark events at ATLAS and CMS
by Beatriz Ribeiro Lopes
Submission summary
| Authors (as registered SciPost users): | Beatriz Ribeiro Lopes |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/2411.03981v1 (pdf) |
| Date submitted: | 2024-11-07 16:30 |
| Submitted by: | Ribeiro Lopes, Beatriz |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | The 17th International Workshop on Top Quark Physics (TOP2024) |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Experimental |
Abstract
Top quark production in association with a photon offers a unique test ground for the standard model predictions, as it is sensitive to the top-photon coupling. These processes are rare when compared to standard top pair production, however the large amounts of data delivered by the LHC open the window to precise measurements. This talk covered the recent inclusive and differential measurements of top quark single and pair production in association with a photon, by the ATLAS and CMS Collaborations. Potential modifications to the top-photon couplings with respect to the standard model predictions are also explored using the standard model effective field theory.
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Thanks so much for providing these nice proceedings. They are very well written and nicely summarize the talk. I only noticed that the ATLAS result was accepted and the numbers/plots slightly changed. Please update plots and numbers to the final version: https://arxiv.org/pdf/2403.09452 . Ref[6] should be adjusted accordingly. Otherwise, I have only minor corrections and adjustments to improve the document's clarity . Please find them below.
Textual comments:
p1, para1: Should be SM effective field theory (EFT)
to be consistent with the abstract
p1, para2: at the LHC in its Run 2 -> at the LHC during Run 2
p1, para2: suggest to add references to the individual results already here
p2, para2: phase spaces enriched in one photon origin with respect to the others. -> phase spaces enriched in photons from a specific origin.
p2, para2: The following is too unspecific: "at next-to-LO (NLO), it becomes computationally unfeasible"
I would suggest to make clear that this is about a 2->7 process that is not possible at NLO.
p2, para2: scale its cross section using a so-called k-factor -> correct its cross section to the NLO value
p2, para2: NLO model which includes only photons from the initial state or off-shell top quarks (referred to as "t¯tγ production") stitched with a LO model filtered to include only photons from the on-shell tops or their decays
Isn't it the other way around? Why are the on-shell top quarks in the NLO production?
p2, para3: Shouldn't one mention DR and DS?
p2, para4: Suggest to add Ref. Phys. Rev. D 44 (1991) 29 for the ABCD method.
p3, para3: Suggest to remove "using k-factors" as jargon. Scaled to NLO is good enough.
p3, para3: This needs some more info: two signal regions and six control regions. Suggest to quickly indicate how the regions are defined.
Or just say in several signal and control regions.
p5, para1: on phase space choices. -> on phase space choice.
Recommendation
Ask for minor revision