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- W1500241567 abstract "Electromagnetic interactions of the spin 3/2 particle are investigated while allowing the propagation of the transverse spin 1/2 component present in the reducible Rarita-Schwinger vector-spinor. This is done by allowing a more general form for the mass term, while leaving the kinetic terms untouched. We find that the interaction is consistent and does not lead to superluminal propagation for a range of the mass parameter where the spin 1/2 component is lighter than the spin 3/2 component, in contrast to the traditional value whereby the spin 1/2 component is removed by making it infinitely massive. The hyperbolicity condition is found to be independent of the magnitude of the electromagnetic field, and the canonically quantized field is constructed to be causal. We then provide appropriate projection operators which reproduce the spin-sum expressions and enable the construction of a physically acceptable propagator. Finally, we suggest a scheme for extension of the Standard Model with Rarita-Schwinger multiplets and identify the muon as the spin 1/2 component of the new multiplet which in addition contains a new, heavy partner of the muon of spin 3/2. The scattering cross-section e+, e- to {mu}+, {mu}- is calculated within this theory, compared to QED, and finally a bound on the new particle's mass is obtained from precision electroweak measurements." @default.
- W1500241567 created "2016-06-24" @default.
- W1500241567 creator A5049328817 @default.
- W1500241567 date "2010-05-19" @default.
- W1500241567 modified "2023-09-27" @default.
- W1500241567 title "Quantum electrodynamics of spin 3/2, II" @default.
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