Title: The two-photon exchange experiment at DESY

Journal Article · · European Physical Journal. A, Hadrons and Nuclei (Online)
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  1. Arizona State University, Tempe, AZ (United States)
  2. Friedrich Wilhelms Universität, Bonn (Germany)
  3. Stony Brook University, NY (United States); Brookhaven National Laboratory, Upton, NY (United States)
  4. Massachusetts Institute of Technology, Cambridge, MA (United States)
  5. Hampton University, VA (United States)
  6. Stony Brook University, NY (United States); Massachusetts Institute of Technology, Cambridge, MA (United States)
  7. Charles University, Prague (Czech Republic)
  8. University of Zagreb (Croatia)
  9. The George Washington University, Washington, DC (United States)
  10. Catholic University of America, Washington, DC (United States)
  11. Massachusetts Institute of Technology, Cambridge, MA (United States); The George Washington University, Washington, DC (United States)
  12. University of Michigan, Ann Arbor, MI (United States)
  13. Johannes Gutenberg Universität, Mainz (Germany)
  14. Deutsches Elektronen-Synchrotron DESY, Hamburg (Germany)
  15. University of Glasgow (Scotland)
+ Show Author Affiliations

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 1035 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 Q2 = 4.6 (GeV/c)2 (twice the range of current measurements). We present and discuss the proposed experimental setup, run plan, and expectations.

Research Organization:
George Washington Univ., Washington, DC (United States); Hampton Univ., Hampton, VA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); The George Washington University, Washington, DC (United States)
Sponsoring Organization:
PIER Hamburg-MIT/BOS Seed Project; US National Science Foundation (NSF); USDOE; USDOE Office of Science (SC); USDOE Office of Science (SC), Nuclear Physics (NP)
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 NatureCopyright Statement
Country of Publication:
United States
Language:
English

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