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- W2976012760 abstract "We consider the decoherence effects in the propagation of neutrinos in a background composed of a scalar particle and a fermion due to the nonforward neutrino scattering processes. Using a simple model for the coupling of the form ${overline{f}}_{R}{ensuremath{nu}}_{L}ensuremath{phi}$, we calculate the contribution to the imaginary part of the neutrino self-energy arising from the nonforward neutrino scattering processes in such backgrounds, from which the damping terms are determined. In the case we are considering, in which the initial neutrino state is depleted but does not actually disappear (the initial neutrino transitions into a neutrino of a different flavor but does not decay into a $fensuremath{phi}$ pair, for example), we associate the damping terms with decoherence effects. For this purpose, we give a precise prescription to identify the decoherence terms, as used in the context of the master or Linblad equation, in terms of the damping terms we have obtained from the calculation of the imaginary part of the neutrino self-energy from the nonforward neutrino scattering processes. The results can be directly useful in the context of dark matter-neutrino interaction models in which the scalar and/or fermion constitute the dark matter and can also serve to guide the generalizations to other models and/or situations in which the decoherence effects in the propagation of neutrinos originate from the nonforward scattering processes may be important. As a guide to estimating such decoherence effects, the contributions to the absorptive part of the self-energy and the corresponding damping terms are computed explicitly in the context of the model we consider, for several limiting cases of the momentum distribution functions of the background particles." @default.
- W2976012760 created "2019-10-03" @default.
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- W2976012760 date "2019-12-30" @default.
- W2976012760 modified "2023-10-18" @default.
- W2976012760 title "Neutrino decoherence in a fermion and scalar background" @default.
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- W2976012760 doi "https://doi.org/10.1103/physrevd.100.115049" @default.
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