Abstract
A Higgs particle produced in association with a Z boson and decaying into two photons is searched for in the data collected by the L3 experiment at LEP. All possible decay modes of the Z boson are investigated. No signal is observed in 447.5 pb−1 of data recorded at centre-of-mass energies from 192 GeV up to 209 GeV. Limits on the branching fraction of the Higgs boson decay into two photons as a function of the Higgs mass are derived. A lower limit on the mass of a fermiophobic Higgs boson is set at 105.4 GeV at 95% confidence level.
Highlights
The Standard Model of the electroweak interactions allows the decay of a Higgs boson h into a photon pair only at the one loop level
No significant excess indicating the production of a Higgs boson decaying into two photons is observed in the data
The confidence level [24] for the absence of a Higgs signal is calculated from the reconstructed di-photon invariant mass as the final discriminant var√iable
Summary
The Standard Model of the electroweak interactions allows the decay of a Higgs boson h into a photon pair only at the one loop level. Such a Higgs is expected to decay dominantly into a pair of photons if its mass is below 90 GeV [4]. Signal Monte Carlo samples are generated using PYTHIA [11] for Higgs masses between 50 and 120 GeV.
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