Speaker
Jürgen Diefenbach
(Universität Mainz)
Description
Measurements of the ratio of the electric and magnetic form factors of
the proton yield different results when using the Rosenbluth or polarization transfer technique. This discrepancy has possibly been
explained by two photon exchange that is not accounted for in the Born
approximation. The OLYMPUS experiment will measure the ratio of the
cross sections of elastic $e^-p$ and $e^+p$ scattering. Obtaining this
ratio is a direct measurement of the two-photon contribution to the
elastic $ep$ cross section and will significantly improve our
understanding of the proton structure. An overview of the experiment
and its current status will be presented in this talk.
Primary author
Jürgen Diefenbach
(Universität Mainz)