The ratio of $e^{\pm}p$ scattering cross sections predicted from the global fit of elastic $ep$ data

Details The ratio of $e^{\pm}p$ scattering cross sections predicted from the global fit of elastic $ep$ data The ratio of $e^{\pm}p$ scattering cross sections predicted from the global fit of elastic $ep$ data

2009-03-25

arxiv.org/abs/0903.4324v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, 4 figures

Scientific paper

We present predictions for the value of the cross section ratio $\sigma(e^+p \to e^+p)/\sigma(e^-p \to e^-p)$, determined from our fit of the elastic $ep$ cross section and polarization data. In this fit we took into account the phenomenological two-photon exchange dispersive correction. The cross section ratios which are expected to be measured by the VEPP-3 experiment are computed. The kinematical region which will be covered by the E04-116 JLab experiment is also considered. It is shown that for both experiments the predicted cross section ratios deviate from unity within more than $3\sigma$.

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