Abstract
A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a data sample of 57.7 pb-1 collected at an average center-of-mass energy of 182.6 GeV with the OPAL detector at LEP. No evidence for contributions from non-Standard Model physics processes was observed. The observed candidates are used to place limits on B(H0 → γγ) assuming a Standard Model production rate for Higgs boson masses up to 92 GeV, and on the production cross section for a scalar resonance decaying into di-photons up to a mass of 170 GeV. Upper limits on the product of cross section and branching ratios, σ(e+e- → XY) × B(X → γγ) × B(Y → ff̄), as low as 70 fb are obtained over the range 10 < MX < 170 GeV for the case where 10 < MY < 160 GeV and MX + MY > 90 GeV, independent of the nature of Y provided it decays to a fermion pair and has negligible width. Higgs scalars which couple only to gauge bosons at Standard Model strength are ruled out up to a mass of 90.0 GeV at the 95% confidence level. Limits are also placed on non-minimal Higgs sectors having triplet representations.
Original language | English |
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Pages (from-to) | 218-230 |
Number of pages | 13 |
Journal | Physics Letters B |
Volume | 437 |
Issue number | 1-2 |
DOIs | |
State | Published - Oct 1 1998 |
Externally published | Yes |
Funding
We particularly wish to thank the SL Division for the efficient operation of the LEP accelerator at all energies and for their continuing close cooperation with our experimental group. We thank our colleagues from CEA, DAPNIA/SPP, CE-Saclay for their efforts over the years on the time-of-flight and trigger systems which we continue to use. In addition to the support staff at our own institutions we are pleased to acknowledge the Department of Energy, USA; National Science Foundation, USA; Particle Physics and Astronomy Research Council, UK; Natural Sciences and Engineering Research Council, Canada; Israel Science Foundation, administered by the Israel Academy of Science and Humanities,; Minerva Gesellschaft; Benoziyo Center for High Energy Physics; Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program; German Israeli Bi-national Science Foundation (GIF); Bundesministerium für Bildung, Wissenschaft; Forschung und Technologie, Germany; National Research Council of Canada; Research Corporation, USA; Hungarian Foundation for Scientific Research, OTKA T-016660, T023793 and OTKA F-023259.
Funders | Funder number |
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Forschung und Technologie | |
German Israeli Bi-national Science Foundation | |
Hungarian Foundation for Scientific Research | OTKA T-016660, OTKA F-023259, T023793 |
Minerva Gesellschaft | |
National Science Foundation | |
U.S. Department of Energy | |
Research Corporation for Science Advancement | |
Natural Sciences and Engineering Research Council of Canada | |
National Research Council Canada | |
Ministry of Education, Culture, Sports, Science and Technology | |
Israel Academy of Sciences and Humanities | |
Israel Science Foundation | |
Bundesministerium für Bildung, Wissenschaft und Kultur |