2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 32, 475-492 (2004)
DOI: 10.1140/epjc/s2003-01469-8

Searches for invisibly decaying Higgs bosons with the DELPHI detector at LEP

The DELPHI Collaboration

(Received: 2 September 2003 / Revised version: 10 November 2003 / / Published online: 15 January 2004)

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/c2 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/c2 at 95% confidence level. An interpretation in the Minimal Supersymmetric extension of the Standard Model (MSSM) and in a Majoron model is also given.

© Società Italiana di Fisica, Springer-Verlag 2004