Journal Article

PUBDB-2025-05134

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Determination of the first-generation quark couplings at the Z-pole

Mękała, K. (Corresponding author)DESY* ; Jeans, D. ; Reuter, J.DESY* ; Tian, J.Extern* ; Żarnecki, A. F.

2025
Springer Heidelberg

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Please use a persistent id in citations: doi:10.1007/JHEP11(2025)050  doi:10.3204/PUBDB-2025-05134

Report No.: DESY-25-063; arXiv:2504.11365

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 theoretical predictions. Future e$^{+}$e$^{−}$ colliders running at the Z-pole would be an excellent tool to improve these constraints. In this paper, 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. The measurement could improve the LEP results by at least an order of magnitude.

Keyword(s): Electroweak Precision Physics ; Flavour Symmetries

Note: cc-by, JHEP11(2025)050. 22 pages, 8 figures

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Contributing Institute(s):

1. Theorie-Gruppe (T)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. EAJADE - Europe-America-Japan Accelerator Development and Exchange Programme (101086276) (101086276)
3. DFG project G:(GEPRIS)390833306 - EXC 2121: Quantum Universe (390833306) (390833306)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; National-Konsortium ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Preprint Mekala, K. (Corresponding author)DESY* ; Jeans, D. ; Reuter, J.DESY* ; Tian, J. ; Żarnecki, A. F.
Determination of the first-generation quark couplings at the Z-pole
[10.3204/PUBDB-2025-01355]     Files  Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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