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First-generation quark couplings

Version 1.0

Żarnecki, Aleksander; Mękała, Krzysztof; Jeans, Daniel; Reuter, Jürgen; Tian, Junping, 2025, "First-generation quark couplings", https://doi.org/10.58132/DVDCDD, Dane Badawcze UW, V1

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Description

Dataset contains data and codes related to the study of the possible use of radiative processes for precise measurement of first-generation quark couplings at future electron-positron collider running at the Z-pole. Results of the study were summarized in the publication "Determination of the first-generation quark couplings at the Z-pole" published in J. High Energ. Phys. 11 (2025) 050.

This research was part of the project "Realistic simulations of exotic processes at future e+e- colliders" funded by National Science Centre, Poland, under grant agreement nr 2021/43/B/ST2/01778.


Methodology

The study was based on large event samples of quark pair-production events for electron-positron collider running at the Z-pole. Samples were generated with the WHIZARD program and processed with the DELPHES framework to model detector performance. Event selection efficiencies and acceptance of the cut used to select events with final state radiation extracted from the Monte Carlo simulation were then used in the semi-analytical framework to extract quark pair-production cross sections and quark couplings. We present a method to extract the values of the Z couplings to light quarks based on up- and down-quarks’ different contributions to radiative and non-radiative Z boson decays. We show that systematic uncertainty in the heavy-flavour tagging performance is the key factor in the analysis, and that reducing it to the sub-permille level is crucial to fully profit from the high luminosity of future e+e− machines.

Files:

  • example Jupyter notebook (Python scripts) for studying coupling measurement precision as a function of the integrated collider luminosity, for different assumptions concerning systematic uncertainties in flavour tagging (Fig. 7 in the paper),
  • input file with photon cut acceptance for radiative and non-radiative events, for different quark flavours (required by the Jupyter notebook)
  • CSV files with final analysis results: expected uncertainties in the quark coupling extraction as a function of the analysis cut and collider luminosity, as presented in Figs. 4 and 7 of the paper.
  • PDF and PNG files of the figures


Software tools used

  • WHIZARD Event Generator web page: https://whizard.hepforge.org/
  • DELPHES: https://github.com/delphes/delphes



Subject
Physics
Keyword

Electroweak precision measurements, Higgs factory, Radiative processes, Z-pole, quark couplings

Related Publication

Mękała, K., Jeans, D., Reuter, J. et al. Determination of the first-generation quark couplings at the Z-pole. J. High Energ. Phys. 11 (2025) 050. https://doi.org/10.1007/JHEP11(2025)050 doi: 10.1007/JHEP11(2025)050

Notes
Author's Accepted Manuscript version of the publication: https://arxiv.org/abs/2504.11365

CC BY-SA Creative Commons Attribution - ShareAlike 4.0 CC BY-SA Creative Commons Attribution - ShareAlike 4.0

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lq_tagging_variation.ipynb
Unknown - 173.7 KB - Dec 29, 2025 - 0 Downloads
MD5: a22ff22be3310d4658ca3aab3eeb18da
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
Jupyter notebook for calculating expected coupling precision
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y_Fy_Gy.dat
Fixed Field Text Data - 5.4 KB - Dec 29, 2025 - 0 Downloads
MD5: e378cbd2ba205fbf83486841207d4cc7
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
input file with photon cut acceptance for radiative and non-radiative events, for different quark flavours
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lq_2vs5flav_ycut.tab
Tabular Data - Original format: Comma Separated Values - 1.0 KB - Dec 29, 2025 - 0 Downloads
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
7 Variables, 19 Observations - UNF:6:cPPs3OFTTLWir5DuanR6cA==
u and d coupling uncertainties from 2- and 5-flavour fits, as a function of the photon selection cut
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lq_2vs5flav_lumi.tab
Tabular Data - Original format: Comma Separated Values - 1.1 KB - Dec 29, 2025 - 0 Downloads
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
7 Variables, 19 Observations - UNF:6:IYAdBgQnlhCAyRj0BnL/LQ==
u and d coupling uncertainties from 2- and 5-flavour fits, as a function of the collider luminosity
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lq_tagging_variation.tab
Tabular Data - Original format: Comma Separated Values - 3.0 KB - Dec 29, 2025 - 1 Download
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
7 Variables, 57 Observations - UNF:6:qxyBU5mHlGfjaLsHsuUr+A==
quark coupling uncertainties from 5-flavour fit, as a function of the collider luminosity, for different assumptions on systematic tagging uncertainty
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DC_rejection.png
PNG Image - 8.9 KB - Dec 29, 2025 - 1 Download
MD5: 85498144d4f7e41bd9eac8d26c9f51c6
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
Figure 1
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DC_rejection.pdf
Adobe PDF - 13.9 KB - Dec 29, 2025 - 0 Downloads
MD5: b9929d2cf3665f64f0856485c770a3b4
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
Figure 1
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qT.png
PNG Image - 14.6 KB - Dec 29, 2025 - 1 Download
MD5: 00e6fb512c45810683fabc19ee16eae0
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
Figure 2 (left)
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qT.pdf
Adobe PDF - 16.7 KB - Dec 29, 2025 - 0 Downloads
MD5: ff708118a9de52e2fc551b0b0b65f300
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
Figure 2 (left)
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y_cut.png
PNG Image - 13.5 KB - Dec 29, 2025 - 2 Downloads
MD5: c625e9974e1ba24e3f9b1e3d1ddab8ad
License: CC BY-SA Creative Commons Attribution - ShareAlike 4.0
Figure 2 (right)
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