2002/06/10 by The OPAL collaboration, G. Abbiendi · 4 citations
Physics and Astronomy · #Boson #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Electron #Electron–positron annihilation #Geometry #Hadron #Higgs boson #Invariant mass #Lepton #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Production (economics) #Quantum mechanics #Recoil #Scalar (mathematics) #Scalar boson #Standard Model (mathematical formulation) #hep-ex
paper · pdf · doi:10.1140/epjc/s2002-01115-1
published as Eur.Phys.J.C27:311-329,2003 · 36 pages, 14 figures
arxiv created 2002/06/10 · openalex publication_date 2003/04/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
This paper describes topological searches for neutral scalar bosons S0 produced in association with a Z0 boson via the Bjorken process e+e- -> S0Z0 at centre-of-mass energies of 91 GeV and 183-209 GeV. These searches are based on studies of the recoil mass spectrum of Z0 -> e+e- and mu+mu- events on a search for S0Z0 with Z0 -> nunu bar and S0 -> e+e- or photons. They cover the decays of the S0 into an arbitrary combination of hadrons, leptons, photons and invisible particles as well as the possibility that it might be stable. No indication for a signal is found in the data and upper limits on the cross section of the Bjorken process are calculated. Cross-section limits are given in terms of a scale factor k with respect to the Standrad Model cross section for the Higgs-strahlung process e+e- -> H0smZ0. These results can be interpreted in general scenarios independently of the decay modes of the S0. The examples considered here are the production of a single new scalar particle with a decay width smaller than the detector mass resolution, and for the first time, two scenarios with continuous mass distributions, due to a single very broad state or several states close in mass.