奥林巴斯实验的测量电荷平均弹性Lepton-Proton散射横截面

论文标题

奥林巴斯实验的测量电荷平均弹性Lepton-Proton散射横截面

Measurement of the Charge-Averaged Elastic Lepton-Proton Scattering Cross Section by the OLYMPUS Experiment

论文作者

Bernauer, J. C., Schmidt, A., Henderson, B. S., Ice, L. D., Khaneft, D., O'Connor, C., Russell, R., Akopov, N., Alarcon, R., Ates, O., Avetisyan, A., Beck, R., Belostotski, S., Bessuille, J., Brinker, F., Calarco, J. R., Carassiti, V., Cisbani, E., Ciullo, G., Contalbrigo, M., De Leo, R., Diefenbach, J., Donnelly, T. W., Dow, K., Elbakian, G., Eversheim, P. D., Frullani, S., Funke, Ch., Gavrilov, G., Gläser, B., Görrissen, N., Hasell, D. K., Hauschildt, J., Hoffmeister, Ph., Holler, Y., Ihloff, E., Izotov, A., Kaiser, R., Karyan, G., Kelsey, J., Kiselev, A., Klassen, P., Krivshich, A., Kohl, M., Lehmann, I., Lenisa, P., Lenz, D., Lumsden, S., Ma, Y., Maas, F., Marukyan, H., Miklukho, O., Milner, R. G., Movsisyan, A., Murray, M., Naryshkin, Y., Benito, R. Perez, Perrino, R., Redwine, R. P., Piñeiro, D. Rodríguez, Rosner, G., Schneekloth, U., Seitz, B., Statera, M., Thiel, A., Vardanyan, H., Veretennikov, D., Vidal, C., Winnebeck, A., Yeganov, V.

论文摘要

我们报告了电子 - 普罗顿和正电子弹性弹性散射横截面的平均值的第一个测量。这款Lepton电荷平均横截面对硬双光子交换的主要影响不敏感，从而使对质子的电磁形态的访问更加可靠。从Desy的Olympus实验获取的数据中提取了横截面，其中交替的储存电子和正电子束从无窗的气态氢靶中散射。从散射的Lepton和Recoil Proton中的一致检测中，在大受欢迎的环形光谱仪中发现了弹性散射事件。从Møller，Bhabha和弹性散射的速率确定亮度。数据在现有的外形全球拟合之间提供了一定的选择性，并将为未来拟合提供有价值的限制。

We report the first measurement of the average of the electron-proton and positron-proton elastic scattering cross sections. This lepton charge-averaged cross section is insensitive to the leading effects of hard two-photon exchange, giving more robust access to the proton's electromagnetic form factors. The cross section was extracted from data taken by the OLYMPUS experiment at DESY, in which alternating stored electron and positron beams were scattered from a windowless gaseous hydrogen target. Elastic scattering events were identified from the coincident detection of the scattered lepton and recoil proton in a large-acceptance toroidal spectrometer. The luminosity was determined from the rates of Møller, Bhabha and elastic scattering in forward electromagnetic calorimeters. The data provide some selectivity between existing form factor global fits and will provide valuable constraints to future fits.

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