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The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 1 Issue 1/2 (1998) pp 31-43
experimental physics:
Search for a massive Di-photon resonance at $\sqrt{s} = 91-172$ GeV
OPAL Collaboration
, K. Ackerstaff et al. (8)
(8) CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland
Received: 2 September 1997
Abstract. 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 $\sqrt{s} \approx M_{\mathrm Z}$ to place limits on $B({\mathrm H}^{0} \to \gamma\gamma$) 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 $B({\mathrm H}^{0} \to \gamma\gamma)\times\sigma({\mathrm e}^+{\mathrm e}^-\to{\mathrm H}^{0}{\mathrm Z}^{0})$ of 290-830 fb are obtained over $40 < M_{\mathrm H} < 160$ GeV. Higgs scalars which couple only to gauge bosons with Standard Model strength are ruled out up to a mass of 76.5 GeV at the 95% confidence level.
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Online publication: December 11, 1997
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