We propose a new measurement of the ratio of positron-proton to electron-proton elastic scattering at DESY. The purpose is to determine the contributions beyond single-photon exchange, which are essential for the Quantum Electrodynamic (QED) description of the most fundamental process in hadronic physics. By utilizing a 20 cm long liquid hydrogen target in conjunction with the extracted beam from the DESY synchrotron, we can achieve an average luminosity of
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Abstract cm$$2.12\times 10^{35}$$ s$$^{-2}\cdot $$ ($$^{-1}$$ times the luminosity achieved by OLYMPUS). The proposed two-photon exchange experiment (TPEX) entails a commissioning run at a beam energy of 2 GeV, followed by measurements at 3 GeV, thereby providing new data up to$$\approx 200$$ (GeV/$$Q^2=4.6$$ c ) (twice the range of current measurements). We present and discuss the proposed experimental setup, run plan, and expectations.$$^2$$ -
Accardi, A. ; Afanasev, A. ; Albayrak, I. ; Ali, S. F. ; Amaryan, M. ; Annand, J. R. ; Arrington, J. ; Asaturyan, A. ; Atac, H. ; Avakian, H. ; et al ( , The European Physical Journal A)null (Ed.)