Sterile neutrino dark matter via GeV-scale leptogenesis?

Ghiglieri, Jacopo; Laine, M.

doi:10.1007/jhep07(2019)078

Cited by 31 publications

(48 citation statements)

References 39 publications

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“…These restrictions are lifted for three or more right handed neutrino flavors [146]. production of sterile neutrino DM by generating chemical potentials that trigger a resonant enhancement of the DM production [151], but current studies suggest that the required magnitude of these potentials [152][153][154] can only be generated for mixing angles that are too small to be accessed by the searches we propose [107,108,155].…”

Section: Model Dependent Remarksmentioning

confidence: 84%

“…In addition to an improved sensitivity in the GeV mass region, heavy ion collisions can also help to shed light on the role of heavy neutrinos in cosmology because they offer an opportunity to study their properties in a dense plasma that roughly resembles the early universe. The generation of lepton asymmetries at temperatures below the electroweak scale is highly sensitive to their mass splitting [107,108,155,156], which is subject to thermal corrections. These late time asymmetries would not affect the baryon asymmetry of the universe, but can lead to the aforementioned resonant production of DM [151,152] that manifests itself in observable modifications of the matter power spectrum, cf., [66,67] and references therein.…”

Section: Model Dependent Remarksmentioning

confidence: 99%

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New long-lived particle searches in heavy-ion collisions at the LHC

et al. 2020

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We show that heavy ion collisions at the LHC provide a promising environment to search for signatures with displaced vertices in well-motivated New Physics scenarios. Compared to proton collisions, they offer several advantages, i) the number of parton level interactions per collision is larger, ii) there is no pile-up, iii) the lower instantaneous luminosity compared to proton collisions allows to operate the LHC experiments with very loose triggers, and iv) there are new production mechanisms that are absent in proton collisions. In the present work we focus on the third point and show that the modification of the triggers alone can increase the number of observable events by orders of magnitude if the long lived particles are predominantly produced with low transverse momentum. Our results show that collisions of ions lighter than lead are well-motivated from the viewpoint of searches for New Physics. We illustrate this for the example of heavy neutrinos in the Neutrino Minimal Standard Model.

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Section: Model Dependent Remarksmentioning

confidence: 84%

Section: Model Dependent Remarksmentioning

confidence: 99%

New long-lived particle searches in heavy-ion collisions at the LHC

et al. 2020

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“…In the νMSM, the oscillations of GeV-scale sterile neutrinos are responsible for the generation of primordial lepton asymmetries via the Akhmedov-Rubakov-Smirnov (ARS) mechanism [150] (see Ref. [151] for very recent work on this topic), which then set the stage for the production of keV-scale sterile-neutrino dark matter. Given the similarity between the νMSM and our setup, it would be interesting to investigate the possibility of an extended type-I seesaw sector featuring a split RHN spectrum.…”

Section: Flavor Models and Dark Mattermentioning

confidence: 99%

Type I seesaw mechanism as the common origin of neutrino mass, baryon asymmetry, and the electroweak scale

et al. 2019

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The type-I seesaw represents one of the most popular extensions of the Standard Model. Previous studies of this model have mostly focused on its ability to explain neutrino oscillations as well as on the generation of the baryon asymmetry via leptogenesis. Recently, it has been pointed out that the type-I seesaw can also account for the origin of the electroweak scale due to heavy-neutrino threshold corrections to the Higgs potential. In this paper, we show for the first time that all of these features of the type-I seesaw are compatible with each other. Integrating out a set of heavy Majorana neutrinos results in small masses for the Standard Model neutrinos; baryogenesis is accomplished by resonant leptogenesis; and the Higgs mass is entirely induced by heavy-neutrino one-loop diagrams, provided that the tree-level Higgs potential satisfies scale-invariant boundary conditions in the ultraviolet. The viable parameter space is characterized by a heavy-neutrino mass scale roughly in the range 10 6.5···7.0 GeV and a mass splitting among the nearly degenerate heavy-neutrino states up to a few TeV. Our findings have interesting implications for high-energy flavor models and low-energy neutrino observables. We conclude that the type-I seesaw sector might be the root cause behind the masses and cosmological abundances of all known particles. This statement might even extend to dark matter in the presence of a keV-scale sterile neutrino.

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“…There the sterile-neutrino masses were neglected. In [20] non-linear equations were obtained also for the massive case.…”

Section: Introductionmentioning

confidence: 99%

Kinetic equations for sterile neutrinos from thermal fluctuations

Bödeker¹,

Schroder²

2020

J. Cosmol. Astropart. Phys.

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We obtain non-linear kinetic equations for sterile neutrino occupancies and lepton minus baryon numbers by matching real time correlation functions of thermal fluctuations computed in an effective description to those computed in thermal quantum field theory. After expanding in the sterile-neutrino Yukawa couplings, the coefficients in the equations are written as real time correlation functions of Standard Model operators. Our kinetic equations are valid for an arbitrary number of sterile neutrinos of any mass spectrum. They can be used to describe, e.g., low-scale leptogenesis via neutrino oscillations, or sterile neutrino dark matter production in the Higgs phase.

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Sterile neutrino dark matter via GeV-scale leptogenesis?

Cited by 31 publications

References 39 publications

New long-lived particle searches in heavy-ion collisions at the LHC

New long-lived particle searches in heavy-ion collisions at the LHC

Type I seesaw mechanism as the common origin of neutrino mass, baryon asymmetry, and the electroweak scale

Kinetic equations for sterile neutrinos from thermal fluctuations

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