Anomalous magnetic moment of the muon with dynamical QCD+QED

Westin, A, Horsley, R, Kamleh, W, Nakamura, Y, Perlt, H, Rakow, PEL ORCID: 0000-0003-4486-2158, Schierholz, G, Schiller, A, Stüben, H, Young, RD
et al (show 1 more authors) (2018) Anomalous magnetic moment of the muon with dynamical QCD+QED. .

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The current 3.5σ discrepancy between experimental and Standard Model determinations of the anomalous magnetic moment of the muon aµ = (g−2)/2 can only be extended to the discovery 5σ regime through a reduction of both experimental and theoretical uncertainties. On the theory side, this means a determination of the hadronic vacuum polarisation (HVP) contribution to better than 0.5%, a level of precision that demands the inclusion of QCD + QED effects to properly understand how the behaviour of quarks are modified when their electric charges are turned on. The QCDSF collaboration has generated an ensemble of configurations with dynamical QCD and QED fields with the specific aim of studying flavour breaking effects arising from differences in the quark masses and charges in physical quantities. Here we study these effects in a calculation of HVP around the SU(3) symmetric point. Furthermore, by performing partially-quenched simulations we are able to cover a larger range of quark masses and charges on these configurations and then fit the results to an SU(3) flavour breaking expansion. Subsequently, this allows for an extrapolation to the physical point.

Item Type: Conference or Workshop Item (Unspecified)
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 15 Jul 2021 08:22
Last Modified: 30 Jul 2021 15:10