TEST OF QED IN E+E-]GAMMAGAMMA AT LEP

被引:22
作者
ADEVA, B
机构
[1] European Laboratory for Particle Physics, CERN
[2] INFN-Sezione di Firenze, University of Firenze
[3] Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, CIEMAT
[4] Johns Hopkins University, Baltimore
[5] INFN-Sezione di Napoli, University of Naples
[6] Northeastern University, Boston
[7] World Laboratory, FBLJA Project
[8] Eidgenössische Technische Hochschule, ETH Zürich
[9] Massachusetts Institute of Technology, Cambridge
[10] Leningrad Nuclear Physics Institute
[11] Central Laboratory of Automation and Instrumentation, CLANP, Sofia
[12] INFN-Sezione di Bologna
[13] Institute of Theoretical and Experimental Physics, ITEP
[14] University of Michigan, Ann Arbor
[15] Tata Institute of Fundamental Research, Bombay
[16] INFN-Sezione di Roma, University of Rome La Sapienza
[17] Princeton University, Princeton
[18] Union College, Schenectady
[19] University of Geneva
[20] Laboratoire de Physique des Particules, LAPP
[21] Central Research Institute for Physics, the Hungarian Academy of Sciences
[22] National Institute for High Energy Physics, NIKHEF
[23] NIKHEF-H, University of Nijmegen
[24] Paul Scherrer Institut (PSI), Würenlingen
[25] University of Lausanne
[26] University of California, San Diego
[27] Carnegie Mellon University, Pittsburgh
[28] Institut de Physique Nucléaire de Lyon, IN2P3-CNRS/Université Claude Bernard
[29] Purdue University, West Lafayette
[30] University of Alabama, Tuscaloosa
[31] Institute of High Energy Physics, IHEP, Beijing
[32] High Energy Physics Institute, Berlin
[33] California Institute of Technology, Pasadena
[34] Shanghai Institute of Ceramics, SIC, Shanghai
[35] Harvard University, Cambridge
[36] University of Hamburg
关键词
D O I
10.1016/0370-2693(90)91177-D
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have measured the cross-section of the reaction e+e- → γγ at center of mass energies around the Z0 mass. The results are in good agreement with QED predictions. For the QED cutoff parameters the limit of Λ+ > 103 GeV and Λ- 118 GeV are found. For the decays Z0→γ,Z0→π0 γ, Z0→γγγ we find upper limits of 2.9 × 10-4,2.9×10-4,4.1×10-4 and 1.2×10-4, respectively. All limits are at 95% CL. © 1990.
引用
收藏
页码:199 / 204
页数:6
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