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
Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the publisher.
Some full text articles may not yet be available without a charge during the embargo (administrative interval).
What is a DOI Number?
Some links on this page may take you to non-federal websites. Their policies may differ from this site.
-
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.$$^2$$ -
Free, publicly-accessible full text available October 1, 2024
-
Free, publicly-accessible full text available August 1, 2024
-
Free, publicly-accessible full text available July 1, 2024