DOE OSTI · 2335423
The two-photon exchange experiment at DESY
Abstract
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 2.12 x 10 35 cm –2 •s –1 (≈ 200 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 Q 2 = 4.6 (GeV/c) 2 (twice the range of current measurements). We present and discuss the proposed experimental setup, run plan, and expectations.
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Alarcon, R., Beck, R., Bernauer, J. C., Broering, M., Christopher, A., Cline, E. W., Dhital, S., Dongwi, B., Fernando, I., Finger, M., Finger, Jr., M., Friščić, I., Gautam, T., Grauvogel, G. N., Hasell, D. K., Hen, O., Horn, T., Ihloff, E., Johnston, R., Kelsey, J., Kohl, M., Kutz, T., Lavrukhin, I., Lee, S., Lorenzon, W., Lunkenheimer, S., Maas, F., Milner, R. G., Moran, P., Nazeer, J., Patel, T., Rathnayake, M., Raymond, R., Redwine, R. P., Schmidt, A., Schneekloth, U., Sokhan, D., Suresh, M., Vidal, C., Yang, Z.. 2024-04-05. The two-photon exchange experiment at DESY. https://doi.org/10.1140/epja%2Fs10050-024-01299-2
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