Test of QED in the reactionse+e−→e+e− ande+e−→μ+μ− at CMS energies from 9.4 to 31.6 GeV

Autor: Berger, Ch., Genzel, H., Grigull, R., Lackas, W., Raupach, F., Klovning, A., Lillestöl, E., Lillethun, E., Skard, J. A., Ackermann, H., Alexander, G., Barreiro, F., Bürger, J., Criegee, L., Dehne, H. C., Devenish, R., Eskreys, A., Flügge, G., Franke, G., Gabriel, W., Gerke, Ch., Knies, G., Lehmann, E., Mertiens, H. D., Michelsen, U., Pape, K. H., Reich, H. D., Stella, B., Ranga Swamy, T. N., Timm, U., Wagner, W., Waloschek, P., Winter, G. G., Zimmermann, W., Achterberg, O., Blobel, V., Boesten, L., Kapitza, H., Koppitz, B., Lewendel, B., Lührsen, W., Maschuw, R., van Staa, R., Spitzer, H., Chang, C. Y., Glasser, R. G., Kellogg, R. G., Lau, K. H., Sechi-Zorn, B., Skuja, A., Welch, G., Zorn, G. T., Bäcker, A., Brandt, S., Derikum, K., Diekman, A., Grupen, C., Meyer, H. J., Neumann, B., Rost, M., Zech, G., Azemoon, T., Daum, H. J., Meyer, O., Rössler, M., Schmidt, D., Wacker, K.
Zdroj: Zeitschrift für Physik C Particles and Fields; December 1980, Vol. 4 Issue: 4 p269-276, 8p
Abstrakt: We have measured Bhabha scattering at cms energies of 9.4, 13, 17, 22, 27.5, 30.0, and 31.6 GeV and the reactione+e-→μ+μ- at 9.4 GeV. The experiment covers spacelike momentum transfers up to −850 GeV2 and timelike momentum transfers up to 1,000 GeV2. We obtain good agreement with QED comparing differential cross sections (measured between 35° and 145°), acoplanarity distributions and the energy dependence (for Bhabha scattering). Defining possible modifications of QED in a model independent way we obtain stringent limits in the range of 70–200 GeV on cutoff parameters. We test to an accuracy of 5–8% the validity of some general principles of QED, such as pointlike coupling, crossing symmetry and μe-universality.
Databáze: Supplemental Index
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