Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment
| العنوان: | Hard Two-Photon Contribution to Elastic Lepton-Proton Scattering Determined by the OLYMPUS Experiment |
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| المؤلفون: | Henderson, Brian, Ice, Lauren, Ates, Ozgur, Avetisyan, Albert, Beck, Reinhard, Belostotski, Stanislav, Bessuille, Jason, Brinker, Frank, Calarco, John, Carassiti, V., Cisbani, E., Ciullo, G., Khaneft, Dmitry, Contalbrigo, Marco, De Leo, R., Diefenbach, Juergen, Donnelly, T. W., Dow, Karen, Elbakian, G., Eversheim, P. D., Frullani, Salvatore, Funke, Christian, Gavrilov, Gennady, O'Connor, Colton, Gläser, B., Goerrissen, Nico, Hasell, Douglas, Hauschildt, Jan, Hoffmeister, Philipp, Holler, Yorck, Ihloff, E., Izotov, Anton, Kaiser, Ralf, Karyan, Gevorg, Russell, Rebecca, Kelsey, James, Kiselev, Alexander, Klassen, Peter, Krivshich, A., Lehmann, Inti, Lenisa, Paolo, Lenz, Dennis, Lumsden, S., Ma, Yue, Maas, Frank, Schmidt, Axel, Marukyan, Hrachya, Miklukho, Oleg, Milner, Richard, Movsisyan, Aram, Murray, Morgan, Naryshkine, Iouri, Perez Benito, R., Perrino, R., Redwine, Robert, Rodriguez Pineiro, David, Bernauer, Jan, Rosner, G., Schneekloth, Uwe, Seitz, B., Statera, M., Thiel, A., Vardanyan, Henrik, Veretennikov, Denis, Vidal, C., Winnebeck, Alexander, Yeganov, Vladislav, Kohl, Michael, OLYMPUS Collaboration, Akopov, Norair, Alarcon, Ricardo |
| المصدر: | College Park, Md. : APS 4 pp. (2016). doi:10.3204/PUBDB-2016-05585 Physical review letters 118(9), 092501 (2017). doi:10.1103/PhysRevLett.118.092501 |
| بيانات النشر: | American Physical Society (APS), 2017. |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | ratio, Physics::Instrumentation and Detectors, Hadron, FOS: Physical sciences, Socio-culturale, General Physics and Astronomy, Electron, 01 natural sciences, transfers, Nuclear physics, Economica, 0103 physical sciences, ddc:550, electromagnetic form factors, Nuclear Experiment (nucl-ex), 010306 general physics, electromagnetic form factors, transfers, ratio, Nuclear Experiment, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Scattering, Generator (category theory), Form factor (quantum field theory), Bremsstrahlung, High Energy Physics::Experiment, Lepton |
| الوصف: | The OLYMPUS collaboration reports on a precision measurement of the positron-proton to electron-proton elastic cross section ratio, $R_{2\gamma}$, a direct measure of the contribution of hard two-photon exchange to the elastic cross section. In the OLYMPUS measurement, 2.01~GeV electron and positron beams were directed through a hydrogen gas target internal to the DORIS storage ring at DESY. A toroidal magnetic spectrometer instrumented with drift chambers and time-of-flight scintillators detected elastically scattered leptons in coincidence with recoiling protons over a scattering angle range of $\approx 20\degree$ to $80\degree$. The relative luminosity between the two beam species was monitored using tracking telescopes of interleaved GEM and MWPC detectors at $12\degree$, as well as symmetric M{\o}ller/Bhabha calorimeters at $1.29\degree$. A total integrated luminosity of 4.5~fb$^{-1}$ was collected. In the extraction of $R_{2\gamma}$, radiative effects were taken into account using a Monte Carlo generator to simulate the convolutions of internal bremsstrahlung with experiment-specific conditions such as detector acceptance and reconstruction efficiency. The resulting values of $R_{2\gamma}$, presented here for a wide range of virtual photon polarization $0.456 Comment: 5 pages, 3 figures, 2 tables |
| وصف الملف: | application/pdf |
| تدمد: | 1079-7114 0031-9007 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c69217fa7001fdcac8ad6de17ed5f623Test https://doi.org/10.1103/physrevlett.118.092501Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....c69217fa7001fdcac8ad6de17ed5f623 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10797114 00319007 |
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