The proton structure function F2(x,Q2) is measured in inelastic QED Compton scattering using data collected with the H1detector at HERA. QED Compton events are used to access the kinematic range of very low virtualities of the exchanged photon,Q2, down to 0.5 GeV2, and Bjorken x up to ¡« 0.06, a region which has not been covered previously by inclusive measurementsat HERA. The results are in agreement with the measurements from fixed target lepton–nucleon scattering experiments.
Aktas, A., Andreev, V., Anthonis, T., Asmone, A., Stella, B.R. (2004). Measurement of the Proton Structure Function F_2 at Low Q^2 in QED Compton Scattering at HERA. PHYSICS LETTERS, B598, 159-171.