BEACH 2016: XII International Conference on Beauty, Charm, Hyperons in Hadronic Interactions

Measurement of the pion form factor in the rho-peak region relevant for (g-2)mu

Not scheduled

15m

Research Hall Room 163 (George Mason University)

Speaker

Christoph Florian Redmer (Johannes Gutenberg-University Mainz)

Description

Measurements of the cross section e+e- --> pi+pi-, i.e. of the pion form
factor, are known to be decisive for the hadronic contribution of the
anomalous magnetic moment of the muon, (g-2)mu. We present a new
measurement of the pion form factor at BESIII in the energy range between
600 and 900 MeV, which corresponds to the peak region of the rho and omega
resonances. The method of initial state radiation has been exploited in
this measurement and a systematic uncertainty of 0.9% has been achieved.
The impact of the new BESIII data on (g-2)mu as well as a comparison to
existing data of the KLOE, BABAR, and VEPP-2M collaborations is presented.