The two-photon exchange experiment at DESY

被引：1

作者：

Alarcon, R. ^{[1
]}

Beck, R. ^{[2
]}

Bernauer, J. C. ^{[3
,4
]}

Broering, M. ^{[5
]}

Christopher, A. ^{[6
]}

Cline, E. W. ^{[3
,5
]}

Dhital, S. ^{[6
]}

Dongwi, B. ^{[6
]}

Fernando, I. ^{[6
]}

Finger, M. ^{[7
]}

Finger Jr., M. ^{[7
]}

Friscic, I. ^{[8
]}

Gautam, T. ^{[6
]}

Grauvogel, G. N. ^{[9
]}

Hasell, D. K. ^{[5
]}

Hen, O. ^{[5
]}

Horn, T. ^{[10
]}

Ihloff, E. ^{[5
]}

Johnston, R. ^{[5
]}

Kelsey, J. ^{[5
]}

Kohl, M. ^{[6
]}

Kutz, T. ^{[5
,9
]}

Lavrukhin, I. ^{[11
]}

Lee, S. ^{[5
]}

Lorenzon, W. ^{[11
]}

Lunkenheimer, S. ^{[11
]}

Maas, F. ^{[12
]}

Milner, R. G. ^{[5
]}

Moran, P. ^{[5
]}

Nazeer, J. ^{[6
]}

Patel, T. ^{[6
]}

Rathnayake, M. ^{[6
]}

Raymond, R. ^{[11
]}

Redwine, R. P. ^{[5
]}

Schmidt, A. ^{[9
]}

Schneekloth, U. ^{[13
]}

Sokhan, D. ^{[14
]}

Suresh, M. ^{[6
]}

Vidal, C. ^{[5
]}

Yang, Z. ^{[11
]}

机构：

[1] Arizona State Univ, Dept Phys & Astron, Tempe, AZ USA

[2] Friedrich Wilhelms Univ, Dept Phys & Astron, Bonn, Germany

[3] SUNY Stony Brook, Ctr Frontiers Nucl Sci, Stony Brook, NY 11794 USA

[4] RIKEN, BNL Res Ctr, Brookhaven Natl Lab, Upton, NY USA

[5] MIT, Lab Nucl Sci, Cambridge, MA 02139 USA

[6] Hampton Univ, Dept Phys & Astron, Hampton, VA USA

[7] Charles Univ Prague, Dept Low Temp Phys, Prague, Czech Republic

[8] Univ Zagreb, Fac Sci, Dept Phys, Zagreb, Croatia

[9] George Washington Univ, Dept Phys, Washington, DC USA

[10] Catholic Univ Amer, Dept Phys, Washington, DC USA

[11] Univ Michigan, Randall Lab Phys, Ann Arbor, MI 48109 USA

[12] Johannes Gutenberg Univ Mainz, Inst Nucl Phys, Mainz, Germany

[13] Deutsch Elektronen Synchrotron DESY, Hamburg, Germany

[14] Univ Glasgow, Dept Phys & Astron, Glasgow, Scotland

来源：

EUROPEAN PHYSICAL JOURNAL A | 2024年 / 60卷 / 04期

基金：

美国国家科学基金会;

关键词：

SQUARED 4-MOMENTUM TRANSFERS; ELECTROMAGNETIC FORM-FACTORS; POLARIZATION TRANSFER; PROTON; CALORIMETER; RATIO;

D O I：

10.1140/epja/s10050-024-01299-2

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$2.12\times 10<^>{35}$$\end{document} cm - 2 center dot \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$<^>{-2}\cdot $$\end{document} s - 1 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$<^>{-1}$$\end{document} ( approximate to 200 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\approx 200$$\end{document} 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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$Q<^>2=4.6$$\end{document} (GeV/c) 2 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$<^>2$$\end{document} (twice the range of current measurements). We present and discuss the proposed experimental setup, run plan, and expectations.

引用

页数：9