Time evolution of cascade decay

Boyanovsky, D.; Lello, Louis

doi:10.1088/1367-2630/16/6/063050

Cited by 11 publications

(28 citation statements)

References 55 publications

(86 reference statements)

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“…These coherences are of particular interest in medium, leading for instance to oscillations via regeneration, as occurs for the K 0 -K 0 system in the presence of nuclear matter [2]. A similar distinction between mixing and oscillations can be identified in the cascade decays of heavy particles [3][4][5][6]. In extensions of the Standard Model, the physical relevance of these two sources of CP -asymmetry has also been identified in the context of leptogenesis (see e.g.…”

Section: Introductionmentioning

confidence: 81%

Lepton asymmetry from mixing and oscillations

Kartavtsev

Millington

Vogel

2016

J. High Energ. Phys.

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We show how the two physically-distinct sources of CP -asymmetry relevant to scenarios of leptogenesis: (i) resonant mixing and (ii) oscillations between different flavours can be unambiguously identified within the Kadanoff-Baym formalism. These contributions are isolated by analyzing the spectral structure of the non-equilibrium propagators without relying on the definition of particle number densities. The mixing source is associated with the usual mass shells, whereas the oscillation source is identified with a third intermediate shell. In addition, we identify terms lying on the oscillation shell that can be interpreted as the destructive interference between mixing and oscillation. We confirm that identical shell structure is obtained in both the Heisenberg-and interaction-picture realizations of the Kadanoff-Baym formalism. In so doing, we illustrate the self-consistency and complementarity of these two approaches. The interaction-picture approach in particular has the advantage that it may be used to analyze all forms of mass spectra from quasi-degenerate through to hierarchical.

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Section: Introductionmentioning

confidence: 81%

Lepton asymmetry from mixing and oscillations

Kartavtsev

Millington

Vogel

2016

J. High Energ. Phys.

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“…There are also some persistent short baseline anomalies (LSND, MiniBooNE) [23,24] that can be explained with an additional sterile neutrino species [18] but tension exists with other experiments [25]. There are plans to search for these sterile neutrinos in forthcoming experiments, many of which involve neutrino production from the decay of meson parent particles, processes in which the subtleties of the decay event itself may prove useful [26]. Other proposed experiments could search for sterile neutrinos via modifications to oscillation formulae on short baseline experiments [27] , monochromatic peaks searches [27,28] or as contributions to lepton flavor violation experiments [29].…”

Section: Introductionmentioning

confidence: 99%

Cosmological implications of light sterile neutrinos produced after the QCD phase transition

Lello

Boyanovsky

2015

Phys. Rev. D

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We study the production of sterile neutrinos in the early universe from π → lν s shortly after the QCD phase transition in the absence of a lepton asymmetry while including finite temperature corrections to the π mass and decay constant f π . Sterile neutrinos with masses 1M eV produced via this mechanism freeze-out at T f ≃ 10M eV with a distribution function that is highly nonthermal and features a sharp enhancement at low momentum thereby making this species cold even for very light masses. Dark matter abundance constraints from the CMB and phase space density constraints from the most dark matter dominated dwarf spheroidal galaxies provide upper and lower bounds respectively on combinations of mass and mixing angles. For π → µν s , the bounds lead to a narrow region of compatibility with the latest results from the 3.55KeV line. The non-thermal distribution function leads to free-streaming lengths (today) in the range of ∼ few kpc consistent with the observation of cores in dwarf galaxies. For sterile neutrinos with mass 1eV that are produced by this reaction, the most recent accelerator and astrophysical bounds on U ls combined with the non-thermal distribution function suggests a substantial contribution from these sterile neutrinos to N ef f .

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“…For this purpose we generalize and extend a recent study on the time evolution of cascade decay [62] to the case of several production and decay channels. We combine this manifestly unitary framework with a wave-packet description to obtain the number of final state events detected at a far detector.…”

Section: Introductionmentioning

confidence: 95%

“…, (2.49) after which it decays on the longer time scale [62]. The total number of active neutrinos of species a can be obtained from the above expression simply by setting Γ h = 0, namely…”

Section: The Modelmentioning

confidence: 99%

Space–time evolution of heavy sterile neutrinos in cascade decays

Boyanovsky

2014

Nuclear Physics B

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Heavy sterile-like neutrinos may be produced resonantly from the decay of pseudoscalar mesons and may decay into several different channels in a cascade Φ → L α ν h ; ν h → {X}. In general these are rare events with displaced vertices. We provide a non-perturbative and manifestly unitary framework that describes the cascade decay and yields the space-time evolution of the probabilities for sterile neutrinos, final states and the total number of events at a far detector. The results are general, valid for Dirac or Majorana neutrinos and only input the total decay rates and branching ratios for the production and decay channels. We apply the results to two examples of "visible" decay: (i) K + → e + ν h → (e + )e + e − ν e via a standard model charged current vertex and (ii) the radiative decay K + → μ + ν h → (μ + )ν a γ . For this latter cascade process we find substantial corrections to previous assessments within the parameter space argued to solve the anomalous excess of electron-like events at MiniBooNE.

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Time evolution of cascade decay

Cited by 11 publications

References 55 publications

Lepton asymmetry from mixing and oscillations

Lepton asymmetry from mixing and oscillations

Cosmological implications of light sterile neutrinos produced after the QCD phase transition

Space–time evolution of heavy sterile neutrinos in cascade decays

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