San José, Teseo; Wittig, Hartmut; Cè, Marco; Gérardin, Antoine; von Hippel, Georg; Meyer, Harvey B.; Miura, Kohtaroh; Ottnad, Konstantin; Risch, Andreas; Wilhelm, Jonas (6 April 2022). The hadronic running of the electromagnetic coupling and electroweak mixing angle. In: The 39th International Symposium on Lattice Field Theory 430 (p. 328). Trieste, Italy: Sissa Medialab 10.22323/1.430.0328
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We present results for the hadronic running of the electromagnetic coupling and the weak mixing angle from simulations of lattice QCD with Nf=2+1 flavours of O(a)-improved Wilson fermions. Using two different discretisations of the vector current, we compute the quark-connected and -disconnected contributions to the hadronic vacuum polarisation (HVP) functions Π¯γγ and Π¯Zγ for spacelike squared momenta Q2≤7 GeV2.
Our results are extrapolated to the physical point using ensembles at four lattice spacings, with pion masses ranging from 130 to 420 MeV.
We observe a tension of up to 3.5 standard deviations between our lattice results for Δα(5)had(−Q2) and estimates based on the R-ratio for space-like momenta in the range Q2=3−7GeV2. To obtain an estimate for Δα(5)had(M2Z), we employ the Euclidean split technique. The implications for comparison with global electroweak fits are assessed.
Item Type: |
Conference or Workshop Item (Paper) |
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Division/Institute: |
10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC) 08 Faculty of Science > Institute of Theoretical Physics |
UniBE Contributor: |
Cè, Marco |
Subjects: |
500 Science > 530 Physics 500 Science |
Publisher: |
Sissa Medialab |
Language: |
English |
Submitter: |
Franziska Stämpfli |
Date Deposited: |
04 Dec 2023 12:42 |
Last Modified: |
04 Dec 2023 12:42 |
Publisher DOI: |
10.22323/1.430.0328 |
BORIS DOI: |
10.48350/189734 |
URI: |
https://boris.unibe.ch/id/eprint/189734 |
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