학술논문
The Two-Photon Exchange Experiment at DESY
Document Type
Working Paper
Author
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.
Source
Subject
Language
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 $2.12\times10^{35}$ cm$^{-2}\cdot$s$^{-1}\cdot$sr$^{-1}$ ($\approx200$ times the luminosity achieved by OLYMPUS). The proposed TPEX experiment entails a commissioning run at 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.
Comment: 10 pages, 14 figures. arXiv admin note: substantial text overlap with arXiv:2301.04708
Comment: 10 pages, 14 figures. arXiv admin note: substantial text overlap with arXiv:2301.04708