International Workshop
"The Structure and Dynamics of Hadrons"
Hirschegg, Kleinwalsertal, Austria -
Information

Title:	Dr.
Family Name:	Distler
First Name:	Michael
Gender:	male
E-Mail:	distleruni-mainz.de
Affiliation for Badge:	Universität Mainz
Institute:	Institut für Kernphysik
Address (Street):	J.J. Becher-Weg 45
Postal Code, City:	55099 Mainz
Country:	Germany
Phone:	+49 6131 392 2956
Fax:	+49 6131 392 2964
Arrival Date:	January 16
Departure Date:	January 22
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Accommodation:	Waldemar-Petersen-Haus
Room Type:	Single room ( ~260-275 ¿ depending on room size )
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Author(s):	Distler, M.O. for the A1 collaboration
Institute(s):	Johannes Gutenberg Universit{\ä}t Mainz, Institut f{\ü}r Kernphysik
Title of talk:	Precise Determination of the Electric and Magnetic Form Factors of the Proton
Abstract:	The electric and magnetic form factors of the nucleons encode information about the spatial distribution of charge and magnetization in the elementary baryonic systems. They provide benchmarks for the understanding of hadronic systems in terms of QCD, either within a fully non-perturbative treatment in terms of lattice QCD or a perturbative treatment within effective field theory. In the talk the results of a high precision measurement (arXiv:1007.5076) of the elastic electron proton scattering cross section will be presented. The experiment was performed at the Mainz Microtron (MAMI) 3-spectrometer-facility in the $Q^2$ range from 0.004 to 1 $(\mathrm{GeV}/c)^2$. Employing a direct fit of a selection of different form factor models to the measured cross sections, the electric and magnetic form factors were extracted. The experiment adds a new, internally consistent extensive data set to the available world data. This data has been used to determine the charge radius of the proton and the Zemach moments (arXiv:1011.1861) of the charge distribution. The implications of the latter for the measurements of the size of the proton from the Lamb shift in muonic hydrogen will be discussed.
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