A search for the single production of doubly-charged Higgs bosons is performed using e+e- collision data collected by the OPAL experiment at centre-of-mass energies between 189 GeV and 209 GeV. No evidence for the existence of H±± is observed. Upper limits are derived on hee, the Yukawa coupling of the H±± to like-signed electron pairs. A 95% confidence level upper limit of hee < 0. 071 is inferred for M(H±±) < 160 GeV assuming that the sum of the branching fractions of the H±± to all lepton flavour combinations is 100%. Additionally, indirect constraints on hee from Bhabha scattering at centre-of-mass energies between 183 GeV and 209 GeV, where the H±± would contribute via t-channel exchange, are derived for M(H±±) < 2 TeV. These are the first results both from a single production search and on constraints from Bhabha scattering reported from LEP.
|Number of pages||16|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - Dec 25 2003|
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics