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Searches for invisibly decaying Higgs bosonswith the DELPHI detector at LEP

2004; Springer Science+Business Media; Volume: 32; Issue: 4 Linguagem: Inglês

10.1140/epjc/s2003-01469-8

1434-6052

The DELPHI Collaboration, J. Abdallah,

Particle Detector Development and Performance

.Searches for H Z production with the Higgs boson decaying into an invisible final state were performed using the data collected by the DELPHI experiment at centre-of-mass energies between 188 GeV and 209 GeV. Both hadronic and leptonic final states of the Z boson were analysed. In addition to the search for a heavy Higgs boson, a dedicated search for a light Higgs boson down to 40 GeV/c 2 was performed. No signal was found. Assuming the Standard Model HZ production cross-section, the mass limit for invisibly decaying Higgs bosons is 112.1 GeV/c 2 at 95% confidence level. An interpretation in the Minimal Supersymmetric extension of the Standard Model (MSSM) and in a Majoron model is also given.