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- W3100657540 abstract "The electromagnetic coupling $alpha$ and the electroweak mixing angle $theta_{mathrm{W}}$ are parameters of the Standard Model (SM) that enter precision SM tests and play a fundamental r^ole in beyond SM physics searches. Their values are energy dependent, and non-perturbative hadronic contributions are the main source of uncertainty to the theoretical knowledge of the running with energy. We present a lattice study of the leading hadronic contribution to the running of $alpha$ and $sin^2theta_{mathrm{W}}$. The former is related to the hadronic vacuum polarization (HVP) function of electromagnetic currents, and the latter to the HVP mixing of the electromagnetic current with the vector part of the weak neutral currents. We use the time-momentum representation (TMR) method to compute the HVP on the lattice, estimating both connected and disconnected contributions on $N_{mathrm{f}}=2+1$ non-perturbatively $O(a)$-improved Wilson fermions ensembles from the Coordinated Lattice Simulations (CLS) initiative. The use of different lattice spacings and quark masses allows us to reliably extrapolate the results to the physical point." @default.
- W3100657540 created "2020-11-23" @default.
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- W3100657540 date "2020-01-04" @default.
- W3100657540 modified "2023-09-30" @default.
- W3100657540 title "The hadronic contribution to the running of the electromagnetic coupling and the electroweak mixing angle" @default.
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- W3100657540 doi "https://doi.org/10.22323/1.363.0010" @default.
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