München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Hadron Structure and Spectroscopy I
HK 3.6: Vortrag
Montag, 18. März 2019, 15:45–16:00, HS 13
Measurement of the η space-like transition form factor at BESIII — •Theodoros Manoussos, Achim Denig, and Christoph Florian Redmer for the BESIII collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, Deutschland
Transition form factors (TFF) of light pseudoscalar mesons play an essential role in the calculation of the hadronic light-by-light contributions of the anomalous magnetic moment of the muon, aµ. To increase the accuracy of its Standard Model prediction to the level of the expected accuracy of the new direct measurements of aµ, especially the contribution due to the TFF of the η meson must be well understood. Based on data collected by the BESIII experiment at the Beijing Electron Positron Collider II (BEPCII), at center of mass energies at 4.178 GeV, the η meson production in photon photon collisions is studied. The analysis aims at the determination of the space-like η transition form factor in the region of momentum transfer below 3 GeV2. In this presentation an overview of the current status of the analysis will be reported.
Supported by DFG(SFB1044)