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Angular momentum non-conserving decays in isotropic media

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arxiv 0907.3000 v1 pith:7NHF5UET submitted 2009-07-17 hep-ph

José F. Nieves , Palash B. Pal This is my paper · ORCID
classification hep-ph
keywords angularmomentumparticleanotherdecayinteractionsisotropicmodel
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Various processes that are forbidden in the 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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    Derives a generalized Lindblad master equation for neutrino evolution with momentum-changing decay and absorption of massless particles, and translates a reactor decoherence bound into a neutrino lifetime limit.

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