Abstract
The contributions to the processes\(e^ + e^ - \to \mu ^ + \mu ^ - ,q\bar q,\gamma \gamma ,e^ + e^ - \), mediated by scalar and/or pseudoscalar bosons are calculated. The constraints on their coupling constants and their masses are investigated as they arise from the radiative decayZ0→+e− γ and from the experimental data for the annihilation processes into lepton, photon and quark pairs. Data one+e−→μ+ μ−, γγ ande+e− seriously reduce the domain of coupling constants to leptons and photons still allowed by the probable value of the width ofZ0→e+e−γ. Experimentse+e−→μ+ μ−, γγ,e+e− at 45 GeV c.m.s. energy with a sensitivity of 10% will decide about the existence of a heavy spinless boson with the presumed phenomenological couplings to leptons and photons. Assuming universality of the coupling to leptons and quarks a conservative bound on the contribution toR arising from spinless boson exchange is already in conflict with the presumed radiative width ofZ0→e+e−γ.
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