The muon g-2: a new data-based analysis

by Alexander Keshavarzi (Liverpool University)

Friday 4 May 2018, 14:30 → 15:30 Europe/Madrid

IFAE Seminar room (IFAE)

The enduring 3.5 sigma (or higher) discrepancy between the experimental measurement and the SM prediction of the anomalous magnetic moment of the muon could be an indication of the existence of new physics beyond the SM. The uncertainty of the SM prediction is limited by the hadronic contributions. The hadronic vacuum polarisation contributions are here determined from dispersion relations using a combination of available hadronic cross section data as input in a predominantly data-driven analysis. Focus has been placed on the development of a new data combination method, that has been advocated to be free of bias and allows for the full use of any available correlated statistical and systematic uncertainties into the determination of both the resulting mean value and corresponding error. This yields the full hadronic $R$-ratio and its covariance matrix from threshold to 11.2 GeV. Using these combined data and pQCD above that range results in updated estimates of the hadronic vacuum polarisation contributions and, therefore, the SM prediction of the muon g-2.