Lepton universality in the ν MSM

Asaka, Takashi; Eijima, Shintaro; Takeda, Kazuhiro

doi:10.1016/j.physletb.2015.01.049

“…Due to their mixing with active neutrinos, heavy neutrinos can affect various EW precision observables, such as the Z invisible decay width and electroweak parameters in the SM [215][216][217]. The same mixing effects also show up in non-unitarity of the leptonic mixing matrix [66][67][68] and the violation of lepton universality in leptonic and semileptonic decays of pseudoscalar mesons [218][219][220]. Using global fits to the EWPD, stringent modelindependent constraints on V N , and there is a mild mass dependence for lower M N values.…”

Section: Electroweak Precision Testsmentioning

confidence: 99%

Neutrinos and collider physics

Deppisch

¹

,

Dev

²

,

Pilaftsis

³

2015

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We review the collider phenomenology of neutrino physics and the synergetic aspects at energy, intensity and cosmic frontiers to test the new physics behind the neutrino mass mechanism. In particular, we focus on seesaw models within the minimal setup as well as with extended gauge and/or Higgs sectors, and on supersymmetric neutrino mass models with seesaw mechanism and with Rparity violation. In the simplest type-I seesaw scenario with sterile neutrinos, we summarize and update the current experimental constraints on the sterile neutrino mass and its mixing with the active neutrinos. We also discuss the future experimental prospects of testing the seesaw mechanism at colliders and in related low-energy searches for rare processes, such as lepton flavor violation and neutrinoless double beta decay. The implications of the discovery of lepton number violation at the Large Hadron Collider for leptogenesis are also studied.

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“…The same mixing effects also show up in non-unitarity of the leptonic mixing matrix [66][67][68] and the violation of lepton universality in leptonic and semileptonic decays of pseudoscalar mesons [218][219][220]. Using global fits to the EWPD, stringent modelindependent constraints on V N Here we have only included the electroweak precision observables and lepton universality observables in the fit.…”

Section: Electroweak Precision Testsmentioning

confidence: 99%

Neutrinos and Collider Physics

Deppisch

¹

2017

Particle Physics at the Year of Light

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We review the collider phenomenology of neutrino physics and the synergetic aspects at energy, intensity and cosmic frontiers to test the new physics behind the neutrino mass mechanism. In particular, we focus on seesaw models within the minimal setup as well as with extended gauge and/or Higgs sectors, and on supersymmetric neutrino mass models with seesaw mechanism and with Rparity violation. In the simplest type-I seesaw scenario with sterile neutrinos, we summarize and update the current experimental constraints on the sterile neutrino mass and its mixing with the active neutrinos. We also discuss the future experimental prospects of testing the seesaw mechanism at colliders and in related low-energy searches for rare processes, such as lepton flavor violation and neutrinoless double beta decay. The implications of the discovery of lepton number violation at the Large Hadron Collider for leptogenesis are also studied.

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“…Additional sterile states might also lead to the violation of lepton flavour universality, as arising from meson decays such as π + → ℓ + α ν α and K + → ℓ + α ν α [43,44,67]. Lepton flavour violating processes also provide important constraints on the sterile fermion parameter space; in particular, the bounds from the muon-electron sector lead to the strongest constraints, which are…”

Section: Jhep08(2016)079mentioning

confidence: 99%

Electron electric dipole moment in Inverse Seesaw models

Abada

¹

,

Toma

²

2016

J. High Energ. Phys.

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Abstract:We consider the contribution of sterile neutrinos to the electric dipole moment of charged leptons in the most minimal realisation of the Inverse Seesaw mechanism, in which the Standard Model is extended by two right-handed neutrinos and two sterile fermion states. Our study shows that the two pairs of (heavy) pseudo-Dirac mass eigenstates can give significant contributions to the electron electric dipole moment, lying close to future experimental sensitivity if their masses are above the electroweak scale. The major contribution comes from two-loop diagrams with pseudo-Dirac neutrino states running in the loops. In our analysis we further discuss the possibility of having a successful leptogenesis in this framework, compatible with a large electron electric dipole moment.

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Lepton universality in the ν MSM

Cited by 20 publications

References 63 publications

Neutrinos and collider physics

Neutrinos and collider physics

Neutrinos and Collider Physics

Electron electric dipole moment in Inverse Seesaw models

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