Anomalous magnetic moment of electron and constraint on composite weak-interaction bosons.

Abstract

We examine the possibility of the existence of composite weak-interaction bosons. Constraints from the anomalous magnetic moment of the electron are used to determine upper limits on the couplings of the bosons, an entire spectrum of which may exist in the composite model. It is found that the coupling of a singlet or triplet pseudoscalar to leptons is very small. This explains the V,A nature of weak interactions. It is assumed that composite bosons have a structure similar to mesons where the constituents are preons instead of quarks. The present experimental status, although in perfect agreement with the standard model, does not rule out composite bosons. We consider the possible signals for compositeness, including the anomalous ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$\ensuremath{\gamma} events.