Speaker
Ms
Vera Guelpers
(University of Mainz)
Description
The hadronic vacuum polarization can be determined from the vector
correlator in a mixed time-momentum representation. We explicitly
calculate the disconnected contribution to the vector correlator, both in the $N_f = 2$ theory and with an additional quenched strange quark, using non-perturbatively $O(a)$-improved Wilson fermions. All-to-all propagators are computed using stochastic sources and a generalized hopping parameter expansion. Combining the result with the dominant connected contribution, we are able to estimate an upper bound for the systematic error that arises from neglecting the disconnected contribution in the determination of $(g-2)_\mu$.
Primary author
Ms
Vera Guelpers
(University of Mainz)
Co-authors
Dr
Anthony Francis
(University of Mainz)
Mr
Benjamin Jaeger
(Swansea University)
Dr
Georg von Hippel
(University of Mainz)
Prof.
Hartmut Wittig
(University of Mainz)
Prof.
Harvey Meyer
(University of Mainz)
