Measurement of the two-photon exchange contribution in elastic ep scattering at VEPP-3

被引：16
|
作者：
Gramolin, A. V. [1 ]
Arrington, J. [2 ]
Barkov, L. M. [1 ]
Dmitriev, V. F. [1 ,3 ]
Gauzshtein, V. V. [4 ]
Golovin, R. A. [1 ]
Holt, R. J. [2 ]
Kaminsky, V. V. [1 ]
Lazarenko, B. A. [1 ]
Mishnev, S. I. [1 ]
Muchnoi, N. Yu. [1 ,3 ]
Neufeld, V. V. [1 ]
Nikolenko, D. M. [1 ]
Rachek, I. A. [1 ]
Sadykov, R. Sh. [1 ]
Shestakov, Yu. V. [1 ,3 ]
Stibunov, V. N. [4 ]
Toporkov, D. K. [1 ,3 ]
de Vries, H. [5 ]
Zevakov, S. A. [1 ]
Zhilich, V. N. [1 ]
机构：
[1] SB RAS, Budker Inst Nucl Phys, Novosibirsk, Russia
[2] Argonne Natl Lab, Argonne, IL 60439 USA
[3] Novosibirsk State Univ, Novosibirsk 630090, Russia
[4] Tomsk Polytech Univ, Inst Nucl Phys, Tomsk, Russia
[5] NIKHEF, Amsterdam, Netherlands
来源：
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS | 2012年 / 225卷
关键词：
elastic electron-proton scattering; two-photon exchange; electromagnetic form factors of the proton; POLARIZATION TRANSFER; FORM-FACTORS; POSITRONS; ELECTRONS; PROTON; NUCLEON;
D O I：
10.1016/j.nuclphysbps.2012.02.045
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
We report on the status of the Novosibirsk experiment on a precision measurement of the ratio R of the elastic e(+)p and e(-)p scattering cross sections. Such measurements determine the two-photon exchange effect in elastic electron-proton scattering. The experiment is conducted at the VEPP-3 storage ring using a hydrogen internal gas target. The ratio R is measured with a beam energy of 1.6 GeV (electron/positron scattering angles are theta = 55 divided by 75 degrees and theta = 15 divided by 25 degrees) and 1 GeV (theta = 65 divided by 105 degrees). We briefly describe the experimental method, paying special attention to the radiative corrections. Some preliminary results are presented.
引用
收藏
页码：216 / 220
页数：5
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