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Measurements of inclusive and differential cross-sections of $t\bar{t}γ$ production in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
by Carmen Diez Pardos
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Submission summary
| Authors (as registered SciPost users): | Carmen Diez Pardos |
| Submission information | |
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| Preprint Link: | https://arxiv.org/abs/2411.15261v1 (pdf) |
| Date submitted: | Nov. 27, 2024, 11:54 a.m. |
| Submitted by: | Diez Pardos, Carmen |
| Submitted to: | SciPost Physics Proceedings |
| Proceedings issue: | The 17th International Workshop on Top Quark Physics (TOP2024) |
| Ontological classification | |
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| Academic field: | Physics |
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Abstract
Cross-section measurements of the associated production of a top quark pair and a photon ($t\bar{t}\gamma$) are performed with an integrated luminosity of 140 fb$^{-1}$ of proton-proton collisions at a centre-of-mass energy of 13 TeV collected by the ATLAS detector at the LHC. The measurement focuses on $t\bar{t}\gamma$ topologies where the photon is radiated from an initial-state parton or one of the top quarks. The differential cross-sections are measured for variables characterising the photon, lepton and jet kinematic properties. The distribution of the photon transverse momentum is used to constrain effective field theory operators related to the electroweak dipole moments of the top quark.
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The text is very clear and provides a nice short summary, nevertheless given the shortness of the proceedings few items might be clarified or referenced. For those I add my request and suggestions below, once they are addressed I recommend these proceedings be published.
Requested changes
Analysis strategy: - L1:"Events in the single-lepton channel are selected if they contain exactly one photon and one isolated lepton" -> is the lepton isolated or passing any quality or pT-relevant criteria? Would be good to add a short description such as "one isolated photon"
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L4: I assume you also request to have at least one photon in this category, at the moment is not explicitly stated.
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L8: "events" -> "background events".
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L14: please add a reference for the ABCD method.
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How do you deal with conversion background? Could a line be added on this?
Cross-section measurements: - L2: "high transverse momentum": can this be quantified?
- L9: "The uncertainties are dominated by the modelling of the t¯tγ processes.". Does this statement apply only to the inclusive cross-section? From Fig 1 I see Jet and b-tagging uncertainties have a similar size to the modelling ones.
EFT interpretation: - Is this performed using both channels?
Fig 2: There is a mismatch between the top right plot and the caption "I(CtW)" vs "R(CtW)", please correct the caption.
Recommendation
Ask for minor revision