Two-photon exchange contribution to elastic electron–proton scattering: measurements at the VEPP-3 storage ring

Two-photon exchange contribution to elastic electron–proton scattering: measurements at the VEPP-3 storage ring

Bibliografiske detaljer
Parent link:	Physica Scripta Vol. 166.— 2015.— [014017, 5 p.]
Corporate Authors:	Национальный исследовательский Томский политехнический университет Физико-технический институт Научный отдел, Национальный исследовательский Томский политехнический университет Физико-технический институт Кафедра экспериментальной физики
Andre forfattere:	Rachek I. A. Igor Anatoljevich, Arrington J., Dmitriev V. F. Vladimir Fedorovich, Gauzshteyn (Gauzshtein) V. V. Vyacheslav Valerjevich, Gramolin A. F. Alexander Valeryevich, Holt R. J., Kaminsky V. V. Vyacheslav Viktorovich, Lazarenko V. A. Vyacheslav Aleksandrovich, Mishnev S. I. Svyatoslav Igorevich, Muchnoy N. Yu. Nikolay Yurjevich, Neyfeld V. V. Valery Valentinovich, Nikolenko D. M. Dmitry Mitrofanovich, Sadykov R. Sh. Rustam Shagitovich, Shestakov Yu. V. Yury Vladimirovich, Stibunov V. N. Victor Nikolaevich
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
Udgivet:	2015
Fag:	электронный ресурс труды учёных ТПУ
Online adgang:	http://dx.doi.org/10.1088/0031-8949/2015/T166/014017
Format:	Electronisk Book Chapter
KOHA link:	https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=648459

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