The two-photon exchange experiment at DESY

Alarcon, R.; Beck, R.; Bernauer, J. C.; Broering, M.; Christopher, A.; Cline, E. W.; Dhital, S.; Dongwi, B.; Fernando, I.; Finger, M.; Finger, 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.

doi:10.1140/epja/s10050-024-01299-2

Title: The two-photon exchange experiment at DESY

Journal Article · 04 April 2024 · European Physical Journal. A, Hadrons and Nuclei (Online)

DOI: https://doi.org/10.1140/epja/s10050-024-01299-2 · OSTI ID:2335423

Alarcon, R.; Beck, R.; Bernauer, J. C.; Broering, M.; Christopher, A.; Cline, E. W.; Dhital, S.; Dongwi, B.; Fernando, I.; Finger, M.; Finger, M.; Friščić, I.; Gautam, T.; Grauvogel, G. N.; Hasell, D. K.; Hen, O.; Horn, T.; Ihloff, E.; Johnston, R.; Kelsey, J. more »

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 $$$$2.12\times 10^{35}$$$$ $2.12 \times 10^{35}$ cm $$$$^{-2}\cdot $$$$ $^{- 2} \cdot$ s $$$$^{-1}$$$$ $^{- 1}$ ( $$$$\approx 200$$$$ $\approx 200$ times the luminosity achieved by OLYMPUS). The proposed two-photon exchange experiment (TPEX) entails a commissioning run at a beam energy of 2 GeV, followed by measurements at 3 GeV, thereby providing new data up to $$Q^2=4.6$$ $Q^{2} = 4.6$ (GeV/ c ) $$^2$$ $^{2}$ (twice the range of current measurements). We present and discuss the proposed experimental setup, run plan, and expectations.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-94ER40818; SC0013941; SC0016583

OSTI ID:: 2335423

Journal Information:: European Physical Journal. A, Hadrons and Nuclei (Online), Journal Name: European Physical Journal. A, Hadrons and Nuclei (Online) Journal Issue: 4 Vol. 60; ISSN 1434-601X

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Germany

Language:: English

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