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

A. B. Weber; A. Denig; A. Esser; A. Tyukin; B. S. Schlimme; C. Sfienti; D. Bosnar; D. G. Middleton; F. Schulz; H. Fonvieille

First measurement of proton's charge form factor at very low Q² with initial state radiation

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arxiv 1612.06707 v1 pith:3SEZE2NR submitted 2016-12-20 nucl-ex hep-ex

First measurement of proton's charge form factor at very low Q² with initial state radiation

M. Mihovilovi\v{c} , A. B. Weber , P. Achenbach , T. Beranek , J. Beri\v{c}i\v{c} , J. C. Bernauer , R. B\"ohm , D. Bosnar

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M. Cardinali L. Correa L. Debenjak A. Denig M. O. Distler A. Esser M. I. Ferretti Bondy H. Fonvieille J. M. Friedrich I. Fri\v{s}\v{c}i\'c K. Griffioen M. Hoek S. Kegel Y. Kohl H. Merkel D. G. Middleton U. M\"uller L. Nungesser J. Pochodzalla M. Rohrbeck S. S\'anchez Majos B. S. Schlimme M. Schoth F. Schulz C. Sfienti S. \v{S}irca S. \v{S}tajner M. Thiel A. Tyukin M. Vanderhaeghen M. Weinriefer

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We report on a new experimental method based on initial-state radiation (ISR) in e-p scattering, in which the radiative tail of the elastic e-p peak contains information on the proton charge form factor ($G_E^p$) at extremely small $Q^2$. The ISR technique was validated in a dedicated experiment using the spectrometers of the A1-Collaboration at the Mainz Microtron (MAMI). This provided first measurements of $G_E^p$ for $0.001\leq Q^2\leq 0.004 (GeV/c)^2$.

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