1997/09/30 by The OPAL Collaboration, K. Ackerstaff et al., K. Ackerstaff et al · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.1007/s100520050060
published as Eur.Phys.J.C1:31-43,1998 · The interpretation of the upper limit for the Higgs -> gamma gamma branching ratio limit assuming the Standard Model production cross section has been clarified. The derived lower mass limit of 76.5 GeV applies to Higgs scalars with nominal Standard Model HZZ couplings and no tree-level fermion couplings
arxiv created 1997/12/03 · openalex publication_date 1998/01/01 · openalex created_date 2017/04/07 · openalex updated_date 2026/08/04
A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a total data sample of 25.7 pb-1 taken at centre-of-mass energies between 130 GeV and 172 GeV with the OPAL detector at LEP. The observed number of events is consistent with the expected number from Standard Model processes. The observed candidates are combined with search results from sqrts ~ MZ to place limits on Br(H0 -> gamma gamma) within the Standard Model for Higgs boson masses up to 77 GeV, and on the production cross section of any scalar resonance decaying into di-photons. Upper limits on Br(H0 -> gamma gamma) x sigma(e+e- -> H0 Z0) of 290 - 830 fb are obtained over 40 < MH < 160 GeV. Type-I two-Higgs-doublet scalars which couple only to gauge bosons are ruled out up to a mass of 76.5 GeV at the 95% confidence level.