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Physics Letters B

Volume 295, Issues 3–4, 3 December 1992, Pages 337-346
Physics Letters B

High mass photon pairs in ℓ+ℓ−γγ events at LEP

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Abstract

From the analysis of the reactions e+e−→l+l−(nγ) (l=e,μ,τ) we observe four events, one e+e−γγ and three μ+μ−γγ, with the invariant mass of the photon pairs close to 60 GeV. These events were selected from a data sample collected in the L3 detector corresponding to 950 000 produced Z0's. More data are necessary to ascertain the origin of these events.

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Cited by (0)

2

Supported by the German Bundesministerium für Forschung und Technologie.

3

Supported by the hungarian OTKA fund under contract number 2970.

1

Deceased.

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