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Search for Higgs bosons and other massive states decaying into two photons in ee collisions at 189 GeV

Ashby, SF; Bloodworth, IJ; Bright-Thomas, P; Charlton, DG; Hawkes, CM; Homer, RJ; ... Ströhmer, R; + view all (1999) Search for Higgs bosons and other massive states decaying into two photons in ee collisions at 189 GeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics , 464 (3-4) 311 - 322.

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Abstract

A search is described for the generic process ee → XY, where X is a neutral heavy scalar boson decaying into a pair of photons, and Y is a neutral heavy boson (scalar or vector) decaying into a fermion pair. The search is motivated mainly by the cases where either X, or both X and Y, are Higgs bosons. In particular, we investigate the case where X is the Standard Model Higgs boson and Y the Z boson. Other models with enhanced Higgs boson decay couplings to photon pairs are also considered. The present search combines the data set collected by the OPAL collaboration at 189 GeV collider energy, having an integrated luminosity of 182.6 pb, with data samples collected at lower energies. The search results have been used to put 95% confidence level bounds, as functions of the mass M, on the product of the cross-section and the relevant branching ratios, both in a model independent manner and for the particular models considered. © 1999 Elsevier Science B.V. All rights reserved.

Type:Article
Title:Search for Higgs bosons and other massive states decaying into two photons in ee collisions at 189 GeV
UCL classification:UCL > School of Life and Medical Sciences > Faculty of Life Sciences > Biosciences (Division of)
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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