Dresden 2013 – scientific programme
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T: Fachverband Teilchenphysik
T 22: Gittereichtheorie
T 22.1: Talk
Monday, March 4, 2013, 16:45–17:00, WIL-C129
Leading-order hadronic contributions to aµ and αQED from Nf=2+1+1 twisted mass fermions — Xu Feng1, •Grit Hotzel2, Karl Jansen3, Marcus Petschlies4, and Dru Renner5 — 1High Energy Accelerator Research Organization (KEK), Tsukuba, Japan — 2Humboldt-Universität zu Berlin, Institut für Physik, Berlin, Germany — 3NIC, DESY, Zeuthen, Germany — 4The Cyprus Institute, Nicosia, Cyprus — 5Jefferson Lab, Newport News, USA
We present the first four-flavour lattice calculation of the leading-order hadronic vacuum-polarisation contribution to the anomalous magnetic moment of the muon, aµhvp, and the hadronic running of the QED coupling constant, Δ αQEDhvp (Q2).
In the heavy sector a mixed-action setup is employed. The bare quark masses are determined from matching the K- and D-meson masses to their physical values. Several light quark masses are used in order to yield a controlled extrapolation to the physical pion mass by utilising a recently proposed improved method. We demonstrate that this method also works in the four-flavour case.