Two-photon exchange contribution to elastic electron–proton scattering: measurements at the VEPP-3 storage ring
| Parent link: | Physica Scripta Vol. 166.— 2015.— [014017, 5 p.] |
|---|---|
| Corporate Authors: | , |
| Other Authors: | , , , , , , , , , , , , , , |
| Summary: | Title screen A striking discrepancy between the results for the ratio of electric and magnetic form factors of the proton obtained by two approaches: the Rosenbluth extraction from the unpolarized cross section and the double-polarization measurements has led to a serious re-examination of the role played by two-photon exchange diagrams. The evaluation of such diagrams could not be done in model-independent way, which means an experimental verification is required. One of the direct ways to do this is to measure the ratio of positron–proton and electron–proton elastic scattering cross-sections for identical kinematics. Such a measurement has been performed at the VEPP-3 storage ring at Novosibirsk. There were two runs at beam energies of 1.6 and 1.0 GeV at several ranges of scattering angle. The measurements covered the transferred momentum Q2 up to 1.5 GeV2 and the virtual photon polarization parameter epsilon down to 0.2 . The VEPP-3 experimental approach is described and the results of the measurements are presented. Режим доступа: по договору с организацией-держателем ресурса |
| Language: | English |
| Published: |
2015
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1088/0031-8949/2015/T166/014017 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=648459 |
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| 200 | 1 | |a Two-photon exchange contribution to elastic electron–proton scattering: measurements at the VEPP-3 storage ring |f I. A. Rachek, J. Arrington, V. F. Dmitriev [et al.] | |
| 203 | |a Text |c electronic | ||
| 300 | |a Title screen | ||
| 330 | |a A striking discrepancy between the results for the ratio of electric and magnetic form factors of the proton obtained by two approaches: the Rosenbluth extraction from the unpolarized cross section and the double-polarization measurements has led to a serious re-examination of the role played by two-photon exchange diagrams. The evaluation of such diagrams could not be done in model-independent way, which means an experimental verification is required. One of the direct ways to do this is to measure the ratio of positron–proton and electron–proton elastic scattering cross-sections for identical kinematics. Such a measurement has been performed at the VEPP-3 storage ring at Novosibirsk. There were two runs at beam energies of 1.6 and 1.0 GeV at several ranges of scattering angle. The measurements covered the transferred momentum Q2 up to 1.5 GeV2 and the virtual photon polarization parameter epsilon down to 0.2 . The VEPP-3 experimental approach is described and the results of the measurements are presented. | ||
| 333 | |a Режим доступа: по договору с организацией-держателем ресурса | ||
| 461 | |t Physica Scripta | ||
| 463 | |t Vol. 166 |v [014017, 5 p.] |d 2015 | ||
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| 701 | 1 | |a Rachek |b I. A. |g Igor Anatoljevich | |
| 701 | 1 | |a Arrington |b J. | |
| 701 | 1 | |a Dmitriev |b V. F. |g Vladimir Fedorovich | |
| 701 | 1 | |a Gauzshteyn (Gauzshtein) |b V. V. |c specialist in the field of nuclear engineering |c Researcher, Tomsk Polytechnic University, Candidate of Physical and Mathematical Sciences |f 1983- |g Vyacheslav Valerjevich |3 (RuTPU)RU\TPU\pers\35050 |9 18325 | |
| 701 | 1 | |a Gramolin |b A. F. |g Alexander Valeryevich | |
| 701 | 1 | |a Holt |b R. J. | |
| 701 | 1 | |a Kaminsky |b V. V. |g Vyacheslav Viktorovich | |
| 701 | 1 | |a Lazarenko |b V. A. |g Vyacheslav Aleksandrovich | |
| 701 | 1 | |a Mishnev |b S. I. |g Svyatoslav Igorevich | |
| 701 | 1 | |a Muchnoy |b N. Yu. |g Nikolay Yurjevich | |
| 701 | 1 | |a Neyfeld |b V. V. |g Valery Valentinovich | |
| 701 | 1 | |a Nikolenko |b D. M. |g Dmitry Mitrofanovich | |
| 701 | 1 | |a Sadykov |b R. Sh. |g Rustam Shagitovich | |
| 701 | 1 | |a Shestakov |b Yu. V. |g Yury Vladimirovich | |
| 701 | 1 | |a Stibunov |b V. N. |c Head of the laboratory of Tomsk Polytechnic University, Doctor of physical and mathematical science |c Russian nuclear physicist |f 1943- |g Victor Nikolaevich |3 (RuTPU)RU\TPU\pers\31002 |9 15232 | |
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