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@ARTICLE{Mekala:626276,
      author       = {Mekala, Krzysztof and Jeans, Daniel and Reuter, Jürgen and
                      Tian, Junping and Żarnecki, Aleksander Filip},
      title        = {{D}etermination of the first-generation quark couplings at
                      the {Z}-pole},
      reportid     = {PUBDB-2025-01355, DESY-25-063. arXiv:2504.11365},
      year         = {2025},
      note         = {22 pages, 8 figures},
      abstract     = {Electroweak Precision Measurements are stringent tests of
                      the Standard Model and sensitive probes to New Physics.
                      Accurate studies of the Z-boson couplings to the
                      first-generation quarks, which are currently constrained
                      from LEP data to a few percent, could reveal potential
                      discrepancies from the theory predictions. Future $e^+e^-$
                      colliders running at the $Z$-pole would be an excellent tool
                      for an analysis based on a comparison of radiative and
                      non-radiative $Z$ boson decays. In this paper, we present a
                      method to extract the values of the $Z$ couplings to light
                      quarks and discuss the uncertainty of the measurement,
                      including contributions from various systematic effects. We
                      show that systematic uncertainty in the heavy-flavour
                      tagging performance is the key factor in the analysis and
                      reducing it to a sub-permille level might be crucial to
                      fully profit from the high luminosity of future $e^+e^-$
                      machines. The measurement could improve the LEP results by
                      at least an order of magnitude.},
      cin          = {T},
      cid          = {I:(DE-H253)T-20120731},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / EAJADE
                      - Europe-America-Japan Accelerator Development and Exchange
                      Programme (101086276) / DFG project G:(GEPRIS)390833306 -
                      EXC 2121: Quantum Universe (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / G:(EU-Grant)101086276 /
                      G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2504.11365},
      howpublished = {arXiv:2504.11365},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2504.11365;\%\%$},
      doi          = {10.3204/PUBDB-2025-01355},
      url          = {https://bib-pubdb1.desy.de/record/626276},
}