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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Hadron Structure and Spectroscopy III
HK 18.7: Vortrag
Dienstag, 19. März 2019, 15:45–16:00, HS 13
Measurement of the Pion Form Factor above 1 GeV using Initial State Radiation at BESIII — •Yasemin Schelhaas and Achim Denig for the BESIII collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Deutschland
The anomalous magnetic moment of the muon aµ=(gµ−2)/2 is one of the most precise measured variables in physics. However, there is a discrepancy of 3.7 standard deviations between the Standard Model (SM) prediction and the direct measurement, known as the (g−2)-puzzle. The accuracy of the SM prediction can be improved using experimental measurements of hadronic processes at e+ e− colliders. One of the most important processes is e+ e− → π+ π−. Using a data set of 3.1 fb−1 taken at a center of mass energy of 4.18 GeV, its cross section is measured at the BESIII experiment at the BEPCII collider in Beijing, exploiting the Initial State Radiation technique. The analysis aims at the determination of the pion form factor above 1 GeV, which is also interesting for spectroscopy. In this presentation an overview of the current status of the analysis is given.
Supported by DFG (SFB 1044).