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

Hadronic vacuum polarization from twisted mass lattice QCD

Not scheduled

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

Marcus Petschlies (HISKP, Uni Bonn)

Description

The hadronic vacuum polarization (hvp) function $\mathrm{\Pi }$ is the basis quantity for high-precision lattice calculations of the hvp contribution to the muon anomalous magnetic moment, $a_{\mu }^{\mathrm{lo}-\mathrm{hvp}}$.
Recently, tensions have emerged between lattice QCD based determinations of intermediate time-distance hvp ("window") contributions to $a_{\mu }^{\mathrm{lo}-\mathrm{hvp}}$ and their counterparts based on $e^{+}{e}^{-}\to \mathrm{hadrons}$ $R$-ratio experimental data.
The investigation of the 4-momentum-dependent polarization function itself provides an alternative approach to zero in on potential momentum regions where such discrepancies originate. We present results for our determination of $\mathrm{\Pi }(Q^2)$ from twisted mass lattice QCD at physical quark masses, towards a $Q^2$-specific comparison with dispersive results.