ISSN:
1434-6052
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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 decayZ 0→+ 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 ofZ 0→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 ofZ 0→e + e − γ.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01410376
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