Search for anomalous Z→γγγ events at LEP

Acciarri, M. ; Adam, A. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (1995) Search for anomalous Z→γγγ events at LEP Physics Letters B, 345 (4). pp. 609-616. ISSN 0370-2693

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We have searched for anomalous Z → γγγ events with the L3 detector at LEP. No significant deviations from the expected QED e+e → γγγ events are observed. The branching ratio upper limit for a compoite Z decaying directly into three photons is found to be 1.0 × 10−5 at 95% C.L. The branching ratio upper limits for the process Z → γX, X → γγ are in the range of 0.4 to 1.3 × 10−5, depending on the mass and width of the scalar particle X. In the context of a model with magnetic monopoles coupling to the Z, we find BR(Z → γγγ) < 0.8 × 10−5 at 95% C.L.; this results in a lower mass limit of 510 GeV for a magnetic monopole.

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ID Code:83560
Deposited On:16 May 2012 13:46
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