# First measurement of proton's charge form factor at very low $Q^2$ with initial state radiation

Abstract : We report on a new experimental method based on initial-state radiation (ISR) in e – p scattering, which exploits the radiative tail of the elastic peak to study the properties of electromagnetic processes and to extract the proton charge form factor ( GEp ) at extremely small Q2 . The ISR technique was implemented in an experiment at the three-spectrometer facility of the Mainz Microtron (MAMI). This led to a precise validation of radiative corrections far away from elastic line and provided first measurements of GEp for 0.001≤Q2≤0.004(GeV/c)2 .
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https://hal.archives-ouvertes.fr/hal-01554811
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Submitted on : Monday, July 3, 2017 - 6:21:02 PM
Last modification on : Friday, July 19, 2019 - 12:42:39 AM

### Citation

M. Mihovilovič, A.B. Weber, P. Achenbach, T. Beranek, J. Beričič, et al.. First measurement of proton's charge form factor at very low $Q^2$ with initial state radiation. Phys.Lett.B, 2017, 771, pp.194-198. ⟨10.1016/j.physletb.2017.05.031⟩. ⟨hal-01554811⟩

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