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HK: Fachverband Physik der Hadronen und Kerne
HK 47: Hadron Structure and Spectroscopy 10
HK 47.2: Talk
Wednesday, March 25, 2015, 14:45–15:00, T/SR25
Narrow Delta-resonance contribution to lepton-proton scattering — •Volodymyr Shubnyi1,2 and Marc Vanderhaeghen1 — 1JGU Mainz, Germany — 2KNU Kiev, Ukraine
The measured value of the proton charge radius from the Lamb shift of energy levels in muonic hydrogen is in strong contradiction, by 7-8 standard deviations, with the value obtained from electronic hydrogen spectroscopy and the value extracted from the unpolarized electron-proton scattering data. The dominant unaccounted higher order contribution in scattering experiments corresponds to two photon exchange (TPE) diagram. The delta-resonance contribution to TPE correction was studied in narrow width approximation.