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[en] The effects of new particles on η decays are considered. It is found that measurements or bounds at the level of 10-7-10-10 for the branching ratios of η → nothing, η → e+e- and η → π l υ yield interesting limits on leptoquark couplings if these particles are heavier than ∼ 300 GeV. Bounds at levels below 10-4 for η → γ e+e-, η → γ + nothing limit couplings of new neutral gauge bosons. We compare the information from η decays and that of other processes (data)
Source
Mayer, B. (ed.); Laboratoire National Saturne - Centre d'Etudes Nucleaires de Saclay, 91 - Gif-sur-Yvette (France); 231 p; ISBN 2-86332-088-2; 
; 1990; p. 125-140; Editions Frontieres; Gif-sur-Yvette (France); International workshop on Rare Decays of light Mesons; Gif-sur-Yvette (France); 29-30 Mar 1990
; 1990; p. 125-140; Editions Frontieres; Gif-sur-Yvette (France); International workshop on Rare Decays of light Mesons; Gif-sur-Yvette (France); 29-30 Mar 1990