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تسجيل مستخدم جديدLeading-order hadronic contributions to a_{mu} and alpha_{QED} from N_f=2+1+1 twisted mass fermions
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We present the first four-flavour lattice calculation of the leading-order hadronic vacuum-polarisation contribution to the anomalous magnetic moment of the muon, a_{mu}^{hvp}, and the hadronic running of the QED coupling constant, Delta alpha_{QED}^{hvp} (Q^2). 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.
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