Combining experimental and cosmological constraints on heavy neutrinos

Drewes, Marco; Garbrecht, Björn

doi:10.1016/j.nuclphysb.2017.05.001

Cited by 152 publications

(237 citation statements)

References 284 publications

(614 reference statements)

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“…The dependence of the parameter Reðω ij Þ is periodic [47], whereas Imðω ij Þ has no limit in general. Both statements can be verified by writing the sine and cosine in terms of the real and imaginary parts of the complex angle.…”

Section: A Methodsmentioning

confidence: 99%

“…The method of calculating these observables and the experimental limits of them are taken from Ref. [47]. The constraints from direct searches and big bang nucleosynthesis (BBN) are especially important since these exclude parts of the parameter space of the active-sterile mixing; more detailed explanations will follow later.…”

Section: A Methodsmentioning

confidence: 99%

“…However, note that these are only indirect constraints. Take the double beta mass as an example, which can be written as [47] …”

Section: Future Experimentsmentioning

confidence: 99%

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Perspectives for tests of neutrino mass generation at the GeV scale: Experimental reach versus theoretical predictions

Rasmussen¹,

Winter²

2016

Phys. Rev. D

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We discuss the parameter space reach of future experiments searching for heavy neutral leptons (HNLs). We consider the GeV seesaw model with three HNL generations and focus on two classes of models: generic assumptions (such as random mass matrices or the Casas-Ibarra parametrization) and flavor symmetry-generated models. We demonstrate that the generic approaches lead to comparable parameter space predictions, which tend to be at least partially within the reach of future experiments. On the other hand, specific flavor symmetry models yield more refined predictions, and some of these can be more clearly excluded. We also highlight the importance of measuring the flavor-dependent couplings of the HNLs as a model discriminator, and we clarify the impact of assumptions frequently used in the literature to show the parameter space reach for the active-sterile mixings.

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Section: A Methodsmentioning

confidence: 99%

Section: A Methodsmentioning

confidence: 99%

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Perspectives for tests of neutrino mass generation at the GeV scale: Experimental reach versus theoretical predictions

Rasmussen¹,

Winter²

2016

Phys. Rev. D

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“…3 Before proceeding, it is useful to make some comments regarding expected ν 4 lifetimes. Given that these interact, at least, via the weak interactions through their mixing with the active neutrinos, weak-decays provide an upper bound to the lifetime of the heavy neutrino.…”

Section: Constraints On An Invisible Heavy Neutrinomentioning

confidence: 99%

Global constraints on a heavy neutrino

2016

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We estimate constraints on the existence of a heavy, mostly sterile neutrino with mass between 10 eV and 1 TeV. We improve upon previous analyses by performing a global combination and expanding the experimental inputs to simultaneously include tests for lepton universality, lepton flavor violating processes, electroweak precision data, dipole moments, and neutrinoless double beta decay. Assuming the heavy neutrino and its decay products are invisible to detection, we further include, in a self-consistent manner, constraints from direct kinematic searches, the kinematics of muon decay, cosmology, and neutrino oscillations, in order to estimate constraints on the values of |Ue4| 2 , |Uµ4| 2 , and |Uτ4| 2 .

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“…In addition to the three light (mostly active) neutrinos -whose masses are given by a type I seesaw relation -the neutral lepton spectrum further contains three heavy states (with masses m ν 4−6 ); should the latter three play a rôle regarding DM, or the BAU, their spectrum and couplings to the active states are subject to several (strong) conditions [43][44][45]. As previously done in [41], we parametrise the physical νMSM degrees of freedom in terms of its six mass eigenvalues, encoding all physical mixing angles and CP violating phases (Dirac and Majorana) in an effective 6 × 6 unitary mixing matrix U (which allows to readily implement the already well-established bounds on the νMSM parameter space).…”

Section: Jhep02(2016)083mentioning

confidence: 99%

Impact of sterile neutrinos on nuclear-assisted cLFV processes

Abada

Romeri

Teixeira

2016

J. High Energ. Phys.

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We discuss charged lepton flavour violating processes occurring in the presence of muonic atoms, such as muon-electron conversion in nuclei CR(µ − e, N), the (Coulomb enhanced) decay of muonic atoms into a pair of electrons BR(µ − e − → e − e − , N), as well as Muonium conversion and decay, Mu − Mu and Mu → e + e − . Any experimental signal of these observables calls for scenarios of physics beyond the Standard Model. In this work, we consider minimal extensions of the Standard Model via the addition of sterile fermions, providing the corresponding complete analytical expressions for all the considered observables. We first consider an "ad hoc" extension with a single sterile fermion state, and investigate its impact on the above observables. Two well motivated mechanisms of neutrino mass generation are then considered: the Inverse Seesaw embedded into the Standard Model, and the νMSM. Our study reveals that, depending on their mass range and on the active-sterile mixing angles, sterile neutrinos can give significant contributions to the above mentioned observables, some of them even lying within present and future sensitivity of dedicated cLFV experiments. We complete the analysis by confronting our results to other (direct and indirect) searches for sterile fermions.

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Combining experimental and cosmological constraints on heavy neutrinos

Cited by 152 publications

References 284 publications

Perspectives for tests of neutrino mass generation at the GeV scale: Experimental reach versus theoretical predictions

Perspectives for tests of neutrino mass generation at the GeV scale: Experimental reach versus theoretical predictions

Global constraints on a heavy neutrino

Impact of sterile neutrinos on nuclear-assisted cLFV processes

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