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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classification ⚛️ nucl-ex hep-ex

keywords chargefactorfirstformprotonradiationa1-collaborationcontains

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

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