KA – TP – 16 – 96 May 1996 HIGGS PARTICLES ∗


Higgs-strahlung e+e− → ZH and WW (ZZ) fusion e+e− → ν̄eνeH (e+e−H) are the most important mechanisms for the production of Higgs bosons at future e+e− linear colliders. We have calculated the cross sections and energy/angular distributions of the Higgs boson for these production mechanisms. When the Z boson decays into (electron-)neutrinos or e+e−, the two production amplitudes interfere. In the crossover region between the two mechanisms the interference term is positive (negative) for ν̄eνe (e +e−) decays, respectively, thus enhancing (reducing) the production rate. The analysis of the mechanism which breaks the electroweak gauge symmetry SU(2)L× U(1)Y down to U(1)EM, is one of the key problems in particle physics. If the gauge fields involved remain weakly interacting up to high energies – a prerequisite for the (perturbative) renormalization of sin θW from the symmetry value 3/8 of grand-unified theories down to a value near 0.2 at low energies – fundamental scalar Higgs bosons [1] must exist which damp the rise of the scattering amplitudes of massive gauge particles at high energies. In the Standard Model (SM) an isoscalar doublet field is introduced to accomodate the electroweak data, leading to the prediction of a single Higgs boson. Supersymmetric extensions of the Standard Model expand the scalar sector to a spectrum of Higgs particles [2]. The Higgs particles have been searched for, unsuccessfully so far, at LEP1, setting a lower limit on the SM Higgs mass of mH > 65.2 GeV [3]. The search for these particles and, if found, the exploration of their profile, will continue at LEP2 [2], the LHC [5], and future ee linear colliders [3]. Figure 1: Higgs-strahlung and vector boson fusion of (CP–even) Higgs bosons in ee collisions. In this note (see also [7]) we will focus on the production of scalar Higgs bosons in ee collisions. The main production mechanisms for these particles are Higgs-strahlung [1] and WW (ZZ) fusion [9–11] [supplemented in supersymmetric theories by associated scalar/pseudoscalar Higgs pair production]. In particular, we will present a comprehensive

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@inproceedings{Djouadi1996KAT, title={KA – TP – 16 – 96 May 1996 HIGGS PARTICLES ∗}, author={A. Djouadi and Howard E . Haber and P. Igo–Kemenes and Patrick Janot and T. Binoth and Edith Chopin and V. Driesen and Wolfgang Hollik and Claus Juenger and Jan Kalinowski and Wolfgang Kilian and Bjong Ro Kim and Mathias Kraemer and Peter M. Zerwas}, year={1996} }