The two-photon exchange experiment at DESY
Name
10050_2024_Article_1299.pdf
Size
1.45 MB
Format
Adobe PDF
Checksum (MD5)
7d8dd6e5194d53a7f1c8874694f8f081
Author(s)
Alarcon, R.
Beck, R.
Bernauer, J. C.
Broering, M.
Christopher, A.
Cline, E. W.
Dhital, S.
Dongwi, B.
Fernando, I.
Finger, M.
Date Issued
April 5, 2024
Publisher
Springer Science and Business Media LLC
Citation
The European Physical Journal A. 2024 Apr 05;60(4):81
Version
Final published version
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
×
10
35
cm
$$^{-2}\cdot $$
-
2
·
s
$$^{-1}$$
-
1
(
$$\approx 200$$
≈
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.
Subjects
Nuclear and High Energy Physics
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1140/epja/s10050-024-01299-2
