Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

Hadronic vacuum polarization from twisted mass lattice QCD

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

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


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


Marcus Petschlies (HISKP, Uni Bonn)


The hadronic vacuum polarization (hvp) function $\Pi$ is the basis quantity for high-precision lattice calculations of the hvp contribution to the muon anomalous magnetic moment, $a_\mu^{\mathrm{lo-hvp}}$.
Recently, tensions have emerged between lattice QCD based determinations of intermediate time-distance hvp ("window") contributions to $a_\mu^{\mathrm{lo-hvp}}$ 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 $\Pi(Q^2)$ from twisted mass lattice QCD at physical quark masses, towards a $Q^2$-specific comparison with dispersive results.

Primary authors

Dr Bartosz Kostrzewa (High Performance Computing and Analytics Lab, Uni Bonn) Prof. Constantia Alexandrou (University of Cyprus, The Cyprus Institute) Marcus Petschlies (HISKP, Uni Bonn) Prof. Carsten Urbach (HISKP, Uni Bonn) Dr Francesco Sanfilippo (Istituto Nazionale di Fisica Nucleare) Dr Giuseppe Gagliardi (Istituto Nazionale di Fisica Nucleare) Dr Jacob Finkenrath (The Cyprus Institute) Dr Karl Jansen (NIC, DESY) Dr Kyriakos Hadjiyiannakou (University of Cyprus & The Cyprus Institute) Dr Marco Garofalo (HISKP, Uni Bonn) Dr Petros Dimopoulos (Università di Parma and INFN) Prof. Roberto Frezzotti (Università di Roma “Tor Vergata”) Prof. Silvano Simula (Istituto Nazionale di Fisica Nucleare) Dr Simone Bacchio (The Cyprus Institute) Prof. Urs Wenger (University of Bern) Prof. Vittorio Lubicz (Università Roma Tre and INFN)

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