Dresden 2013 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 11: Elektroschwache Physik (Theorie) 2

T 11.2: Vortrag

Montag, 4. März 2013, 17:00–17:15, WIL-A120

Heavy lepton contribution to the anomalous magnetic moment of the muon and the electron at four loops in QED — •Alexander Kurz, Tao Liu, Peter Marquard, and Matthias Steinhauser — Institut fuer Theoretische Teilchenphysik, Karlsruhe

We present results for the QED contribution from a heavy lepton loop to the anomalous magnetic moment of the muon and the electron. Exploiting the strong hierarchy between the tau, muon and electron masses (m_τ≫ m_µ≫ m_e), we use the method of asymptotic expansion which leads to on-shell and vacuum integrals up to three and four loops, respectively. Analytic results are presented up to four loops for the muon anomalous moment involving virtual τ-lepton loops and for the electron magnetic moment involving τ- and µ-lepton loops.