Search for new physics in energetic single photon production in e + e “ annihilation at the Z resonance L 3

F. J. Eppling,F. C. Erné, J. P. Emenwein, P. Extermann, R. Faccini al, S. Falciano al, A. Favara, O. Fedin am, M. Felcini ax, B. Fenyi, T. Ferguson, F. Ferroni al, H. Fesefeldt,E. Fiandrini, P. H. Fisher, G. Forconi, S. N. Ganguli,J. Gerald, N. Gheordanescu, S. Goldfarb, A. Gougas,G. Gratta, B. Hartmann, A. Hervé,V. Innocente, K. Jenkes, B. N. Jin, L. W. Jones,P. de Jong,J. S. Kapustinsky, Y. Karyotakis, W. W. Kinnison, A. Kirkby ah, D. Kiss,W. Kittel,A. Klimentov, W. Krenz, C. Lapoint, P. Lecoq, K. Lübelsmeyer

semanticscholar（2017）

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摘要

Using a sample of e + e " annihilation events collected with the L3 detector at the Z resonance corresponding to an integrated luminosity of 137 p b _ we have searched for anomalous production o f y X final states where X represents stable, weakly interacting particles and the photon energy is greater than 15 GeV. The sample of events found is consistent with Standard Model expectations. Upper limits are set on Z y couplings, the r neutrino magnetic moment, and the branching ratio for Z -> y X . © 1997 Elsevier Science B.V. 6 Supported also by the Comisión Interministerial de Ciencia y Technología, M. Acciarri et a l . / Physics Letters B 412 (1997) 201-209 205

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