Neutrino damping in a fermion and scalar background

Nieves, José F.; Sahu, Sarira

doi:10.1103/physrevd.99.095013

Cited by 10 publications

(7 citation statements)

References 40 publications

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“…The neutrino interactions with the background particles can also produce damping terms in the neutrino effective potential and index of refraction. In a previous work [3] we considered the calculation of such damping terms in a background of fermions (f) and scalars (ϕ) as a consequence of processes such as ν þ ϕ ↔ f and ν þf ↔φ, involving the coupling of neutrinos to those particles of the generic formf R ν L ϕ. There we calculated the imaginary part (or more precisely the absorptive part) of the neutrino self-energy, from which the damping terms in the effective potential and dispersion relation were obtained.…”

Section: Introductionmentioning

confidence: 90%

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Neutrino decoherence in an electron and nucleon background

Nieves

Sahu

2020

Phys. Rev. D

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We consider the decoherence effects in the propagation of active neutrinos due to the nonforward neutrino scattering processes in a matter background composed of electrons and nucleons. We calculate the contribution to the imaginary part of the neutrino self-energy arising from such processes. Since 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) those processes should be associated with decoherence effects that cannot be described in terms of the coherent evolution of the state vector. Based on the formalism developed in our previous work for treating the nonforward scattering processes using the notion of the stochastic evolution of the state, we identify the jump operators, as used in the context of the master or Lindblad equation, in terms of the results of the calculation of the nonforward neutrino scattering contribution to the imaginary part of the neutrino self-energy. As a guide to estimating the decoherence effects in situations of practical interest we give explicit formulas for the decoherence terms for different background conditions, and point out some of the salient features in particular the neutrino energy dependence. To establish contact with previous works in which the decoherence terms are treated as phenomenological parameters, we consider the solution to the evolution equation in the two-generation case. We give formulas that are useful for estimating the effects of the decoherence terms under various conditions and environments, including the typical conditions applicable to long baseline experiments, where matter effects are important. In those contexts the effects appear to be small, and indicative that if significant decoherence effects were to be found they would be due to nonstandard contributions to the decoherence terms.

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Section: Introductionmentioning

confidence: 90%

“…The Fermi momentum is given in terms of the number density f x of the background fermions by p Fx ¼ ð3π 2 n x Þ 4 3 .…”

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confidence: 99%

Neutrino decoherence in an electron and nucleon background

Nieves

Sahu

2020

Phys. Rev. D

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“…Potentials induced by light mediator in medium with light scatterers were computed recently in connection to possible existence of light dark sector and light dark matter [8][9][10][11][12][13][14]. Mediators and scatterers of different nature were explored: fermions, scalars, gauge bosons.…”

Section: Jhep09(2021)177mentioning

confidence: 99%

Resonance refraction and neutrino oscillations

Smirnov

Valera

2021

J. High Energ. Phys.

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The refraction index and matter potential depend on neutrino energy and this dependence has a resonance character associated to the production of the mediator in the s−channel. For light mediators and light particles of medium (background) the resonance can be realized at energies accessible to laboratory experiments. We study properties of the energy dependence of the potential for different C-asymmetries of background. Interplay of the background potential and the vacuum term leads to (i) bump in the oscillation probability in the resonance region, (ii) dip related to the MSW resonance in the background, (iii) substantial deviation of the effective ∆m2 above the resonance from the low energy value, etc. We considered generation of mixing in the background. Interactions with background shifts the energy of usual MSW resonance and produces new MSW resonances. Searches of the background effects allow us to put bounds on new interactions of neutrinos and properties of the background. We show that explanation of the MiniBooNE excess, as the bump due to resonance refraction, is excluded.

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“…Before going to those details, we briefly review and borrow from Refs. [30] and [32] the specific formulas that we will use to determine the dispersion relations from the self-energy calculation.…”

Section: Contextmentioning

confidence: 99%

Neutrino effective potential in a fermion and scalar background

Nieves

Sahu

2018

Phys. Rev. D

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We consider the neutrino self-energy in a background composed of a scalar particle and a fermion using a simple model for the coupling of the form λfRνLφ. The results are useful in the context of Dark Matter-neutrino interaction models in which the scalar and/or fermion constitute the dark-matter. The corresponding formulas for models in which the scalar particle couples to two neutrinos via a coupling of the form λ (ννφ)ν c R νLφ are then obtained as a special case. In the presence of these interactions there can be new contributions to the neutrino effective potential and index of refraction in the context of neutrino collective oscillations in a supernova and in the Early Universe hot plasma before neutrino decoupling. The formulas obtained here can be used to estimate those effects and/or put limits on the model parameters based on the contribution that such interactions can have in those contexts. A particular feature of the results is that the contribution to the neutrino self-energy or effective potential in a neutrino background due to the ννφ coupling is proportional to the antineutrino-neutrino asymmetry (nν − nν ), in contrast to the standard Z contribution which is proportional to (nν − nν ). Therefore the two contributions tend to cancel. If the cancellation is significant, it is conceivable that the O(1/m 4 φ ) terms give the dominant contribution. Alternatively, a limit can be set by requiring that the contribution of the ννφ interaction to the neutrino effective potential does not cancel the standard contribution in an appreciable way.

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Neutrino damping in a fermion and scalar background

Cited by 10 publications

References 40 publications

Neutrino decoherence in an electron and nucleon background

Neutrino decoherence in an electron and nucleon background

Resonance refraction and neutrino oscillations

Neutrino effective potential in a fermion and scalar background

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