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T: Fachverband Teilchenphysik
T 32: Jenseits des Standardmodells 1 (Theorie)
T 32.9: Vortrag
Montag, 9. März 2015, 18:45–19:00, K.12.23 (K1)
Leading hadronic contributions to the leptons (g−2), αQED and sin2(θW) from twisted mass LQCD — •Grit Hotzel1, Florian Burger1, Karl Jansen2, and Marcus Petschlies3 — 1Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, D-12489 Berlin, Germany — 2John von Neumann Institute for Computing (NIC), DESY, Platanenallee 6, D-15738 Zeuthen, Germany — 3The Cyprus Institute, P.O. Box 27456, 1645 Nicosia, Cyprus
We present our results for the leading-order hadronic contributions to the electron, the muon, and the tau anomalous magnetic moments obtained with four dynamical quarks. Performing the continuum limit and an analysis of systematic effects, full agreement with phenomenological results is found. To estimate the impact of omitting the quark-disconnected contributions to the hadronic vacuum polarization we investigate them on one of the four-flavour ensembles. Additionally, the light quark contributions on the four-flavour sea are compared to the values obtained for Nf=2 physically light quarks. Furthermore, the correspondig results for the leading hadronic contribution to the running of the finestructure constant and the weak mixing angle in the low-momentum region will be provided.