Search for Higgs bosons and new particles decaying into two photons at S**(1/2) = 183-GeV
Jun, 199821 pages
Published in:
- Phys.Lett.B 437 (1998) 218-230
e-Print:
- hep-ex/9808014 [hep-ex]
Report number:
- CERN-EP-98-093,
- CERN-EP-98-93
Experiments:
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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 BR (H to gamma gamma) 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, sigma(e+e- to XY) * BR(X to gamma gamma) * BR(Y to f fbar) as low as 70fb are obtained over the M(X) range 10 - 170 GeV for the case where 10 < M(Y) < 160 GeV and M(X)+M(Y) > 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.Note:
- 21 pages, LaTeX, 4 eps figures included, submitted to Physics Letters B Report-no: CERN-EP/98-093
- electron positron: colliding beams
- electron positron: annihilation
- new particle: search for
- Higgs particle: radiative decay
- scalar particle: radiative decay
- photon: pair production
- Z0: associated production
- Higgs particle: associated production
- fermion: pair production
- final state: (fermion antifermion 2photon)
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