The 39th International Symposium on Lattice Field Theory (Lattice 2022)

The hadronic running of the electromagnetic coupling and electroweak mixing angle (Part I)

9 Aug 2022, 17:30

20m

CP1-HSZ/0.001 (CP1-HSZ) - HS3 (CP1-HSZ)

Oral Presentation QCD in searches for physics beyond the Standard Model QCD in searches for physics beyond the Standard Model

Speaker

Miguel Teseo San José Pérez (IJCLab)

Description

We employ $N_{\mathrm{f}}=2+1$ flavours of $O(a)$ improved Wilson fermions to determine the hadronic vacuum polarisation functions ${\overline{\mathrm{\Pi }}}^{\gamma \gamma }$ and ${\overline{\mathrm{\Pi }}}^{\gamma Z}$ for Euclidean squared momenta $Q^2\le 7$ ${\mathrm{GeV}}^2$. We extrapolate the results to the physical point using ensembles at four lattice spacings and several pion masses, including its physical value. We observe a tension of up to 3.5 standard deviations between our lattice results for $\mathrm{\Delta }{\alpha }_{\mathrm{had}}^{(5)}(-Q^2)$ and estimates based on the $R$-ratio for space-like momenta in the range $3-7{\mathrm{GeV}}^2$.

Presentation materials

lattice-2022.pdf