Neutrino dynamics below the electroweak crossover

Ghiglieri, Jacopo; Laine, M.

doi:10.1088/1475-7516/2016/07/015

Cited by 72 publications

(171 citation statements)

References 53 publications

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“…However, this resonance is screened by the imaginary part (damping rate) (this phenomenon was also noticed in ref. [26]), and under the condition that θ ≪ 1 and the validity of the approximations leading to the above results, the possible presence of this resonance will not yield a large enhancement in the effective mixing angle. This aspect will be discussed in detail in section (IV).…”

Section: Mass Eigenstates Damping Rates and Mixing Angles In Thementioning

confidence: 78%

“…In Refs. [11,[22][23][24][25][26][27] it was yield a solution to the 7 Li problem [74,78,79] motivates our study of the production and freeze out of sterile neutrinos in a wider range of masses and temperatures. In this article we study the production of sterile neutrinos solely from standard model interactions.…”

Section: Introductionmentioning

confidence: 93%

“…Ref. [26] discusses further contributions at T >> M W which merit further study but are outside the scope of this article.…”

Section: B Other Contributions and Higher Ordersmentioning

confidence: 99%

“…[26] studied the damping rate of GeV sterile neutrinos at high temperature within the context of the washout rate of leptonic densities.…”

Section: Introductionmentioning

confidence: 99%

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Production of heavy sterile neutrinos from vector boson decay at electroweak temperatures

2017

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In the standard model extended with a see-saw mass matrix, we study the production of sterile neutrinos from the decay of vector bosons at temperatures near the masses of the electroweak bosons.We derive a general quantum kinetic equation for the production of sterile neutrinos and their effective mixing angles, which is applicable over a wide range of temperature, to all orders in interactions of the standard model, and to leading order in a small mixing angle for the neutrinos.We emphasize the relation between the production rate and Landau damping at one loop order, and show that production rates and effective mixing angles depend sensitively upon the neutrino's helicity. Sterile neutrinos with positive helicity interact more weakly with the medium than those with negative helicity, and their effective mixing angle is not modified significantly. Negative helicity states couple more strongly to the vector bosons, but their mixing angle is strongly suppressed by the medium. Consequently, if the mass of the sterile neutrino is 8.35 MeV, there are fewer states with negative helicity produced than those with positive helicity. There is an MikheyevSmirnov-Wolfenstein type resonance in the absence of lepton asymmetry, but due to screening by the damping rate, the production rate is not enhanced. Sterile neutrinos with negative helicity freeze-out at T − f ≃ 5 GeV whereas positive helicity neutrinos freeze-out at T + f ≃ 8 GeV, with both distributions far from thermal. As the temperature decreases, due to competition between a decreasing production rate and an increasing mixing angle, the distribution function for states with negative helicity is broader in momentum and hotter than that for those with positive helicity. Sterile neutrinos produced via vector boson decay do not satisfy the abundance, lifetime and cosmological constraints to be the sole dark matter component in the universe. Massive sterile neutrinos produced via vector boson decay might solve the 7 Li problem, albeit at the very edge of the possible parameter space. A heavy sterile neutrino with a mass of a few MeV could decay into light sterile neutrinos, of a few keV in mass, that contribute to warm dark matter. We argue that heavy sterile neutrinos with lifetime ≤ 1/H0 reach local thermodynamic equilibrium.

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Section: Mass Eigenstates Damping Rates and Mixing Angles In Thementioning

confidence: 78%

Section: Introductionmentioning

confidence: 93%

“…Ref. [26] discusses further contributions at T >> M W which merit further study but are outside the scope of this article.…”

Section: B Other Contributions and Higher Ordersmentioning

confidence: 99%

“…[26] studied the damping rate of GeV sterile neutrinos at high temperature within the context of the washout rate of leptonic densities.…”

Section: Introductionmentioning

confidence: 99%

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Production of heavy sterile neutrinos from vector boson decay at electroweak temperatures

2017

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“…We have shown how pQCD calculations are now available at NLO for the dilepton rate at finite k in a wide 5 The Euclidean version of the results of [6,7,4] is available online [19], with parameters tuned to the lattice data in [20]. A zeromomentum dataset is also present, combining data from [21,22].…”

Section: Discussionmentioning

confidence: 99%

The thermal dilepton rate at NLO at small and large invariant mass

Ghiglieri

2016

Nuclear and Particle Physics Proceedings

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We report on a recent next-to-leading order perturbative determination of the dilepton rate from a hot QCD plasma for frequency and momentum of the order of the temperature and for much smaller invariant mass M ∼ gT . We briefly review the calculation, which generalizes the previous one for the photon case (M = 0). We then analyze the consequences of the new calculation for the extraction of the photon rate from the small mass dilepton measurements. We then review a recent NLO determination at large M and we show how to match and merge its results with the low-mass ones, resulting in a single rate which is NLO-accurate over the phenomenologically relevant region.

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Low-scale leptogenesis with three heavy neutrinos

Abada

Arcadi

Domcke

et al. 2019

J. High Energ. Phys.

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Leptogenesis induced by the oscillations of GeV-scale neutrinos provides a minimal and testable explanation of the baryon asymmetry of the Universe. In this work we extend previous studies invoking only two heavy neutrinos to the case of three heavy neutrinos. We find qualitatively new behaviour as a result of lepton number violating oscillations and decays, strong flavour effects in the washout and a resonant enhancement due to matter effects. An approximate global B −L symmetry (representing the difference of baryon and a generalised lepton number) can protect the light neutrino masses from large radiative corrections, while simultaneously providing the ingredients for the resonant enhancement of the lepton asymmetry due to thermal contributions to the heavy neutrino dispersion relations. This mechanism is particularly efficient for large heavy neutrino mixing angles near the current experimental limits, a regime in which leptogenesis is not feasible in the minimal scenario with two heavy neutrinos. In this new parameter regime, low-scale leptogenesis is testable by the LHC and other existing experiments.

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Neutrino dynamics below the electroweak crossover

Cited by 72 publications

References 53 publications

Production of heavy sterile neutrinos from vector boson decay at electroweak temperatures

Production of heavy sterile neutrinos from vector boson decay at electroweak temperatures

The thermal dilepton rate at NLO at small and large invariant mass

Low-scale leptogenesis with three heavy neutrinos

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