Angular momentum non-conserving decays in isotropic media |
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| Authors: | José F. Nieves and Palash B. Pal |
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| Affiliation: | 1.Laboratory of Theoretical Physics, Department of Physics,University of Puerto Rico,Río Piedras,Puerto Rico;2.Saha Institute of Nuclear Physics,Calcutta,India |
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| Abstract: | Various processes that are forbidden in vacuum due to angular momentum conservation can occur in a medium that is isotropic and does not carry any angular momentum. We illustrate this by considering explicitly two examples. The first one is the decay of a spin-0 particle into a photon and another spin-0 particle, using a model involving the Yukawa interactions of the scalar particles with a charged fermion field. The second one involves the decay of a neutrino into another neutrino and a graviton, in the standard model of particle interactions augmented with the linearized gravitational couplings. |
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