Heidelberg 2015 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 18: Hadron Structure and Spectroscopy 3
HK 18.4: Talk
Monday, March 23, 2015, 18:00–18:15, T/SR19
Measuring the proton form factor at very low Q2 — •Adrian Weber — Institut für Kernphysik, Johannes Gutenberg Universität Mainz
The proton is a fundamental constituent of matter. Yet the determination of its radius via interaction with electrons and muons seems to yield different radii leading to the so called proton radius puzzle.
To bring new insight into the observed discrepancy a novel electron scattering experiment at MAMI (Mainz Microtron) was performed aiming to determine the electric form factor of the proton at Q2 as low as 1−3· 10−4 (GeV/c)2, by using a method based on initial state radiation. The goal of the experiment is to obtain the electric form factor with an accuracy of 1% and extract a new value for the proton charge radius. In this presentation a brief overview of the experiment will be presented together with the underlying theory. Then the present status of the analysis and preliminary results will be discussed.