Phys. Rev. D 51, 3149–3152 (1995)Theoretical expectations for high mass photon pairs in l+l-γγ events at CERN LEP and SLCReceived 18 February 1994; published in the issue dated 1 April 1995 Recently, the L3 Collaboration has reported the observation of four events in the reactions e+e-→ll¯+γγ, l=e,μ,τ, with the invariant photon pair mass near 60 GeV in a data sample collected in the L3 detector corresponding to 950 000 produced Z0’s. More recently, more data from the other LEP Collaborations have become available. In this paper we use the Monte Carlo generator yfs3 and our recent exact results on e+e-→ll¯+γγ to assess the QED expectations for such L3-type high mass photon pair events in e+e-→ll¯+γγ+n(γ) near the Z0 resonance. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.51.3149
DOI:
10.1103/PhysRevD.51.3149
PACS:
13.10.+q, 12.20.Ds, 13.38.Dg
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