Search for high mass gamma gamma resonances in e+ e ---> lepton+ lepton- gamma gamma, neutrino anti-neutrino gamma gamma and q anti-q gamma gamma at LEP-1
(1996) Zeitschrift für Physik. C, Particles and fields — Vol. 72, p. 179-190 (1996)
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- A search for high mass photon pairs from the processes e+e - ~ g+g-3`3` , e+e - ~ q~3`3` and e+e - ---, uF3`3` with the DELPHI detector at LEP I is reported. From a data sample containing 3.5 million hadronic Z ~ decays, collected by DELPHI during the years 1991 to 1994, 79 events with two charged leptons and two isolated photons were selected with photon pair masses above 10 GeV/c 2 , where 76 4- 6 events were predicted from standard sources. In the same data sample, no u~3`3` candidates were found and no accumulation of events was visible for "73` masses above 10 GeV/c 2 in the qqT'/ channel. Upper limits at 95% confidence level on the Z ~ branching ratios for the three different channels were extracted from the data. In the mass region m77 > 30 GeV/c 2 the limits obtained are between 3 x 10-6and 4x 10 -6.
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Abreu, P., Cortina Gil, E., & DELPHI Collaboration. (1996). Search for high mass gamma gamma resonances in e+ e ---> lepton+ lepton- gamma gamma, neutrino anti-neutrino gamma gamma and q anti-q gamma gamma at LEP-1. Zeitschrift für Physik. C, Particles and fields, 72, 179-190. https://doi.org/10.1007/s002880050236 (Original work published 1996)