Limits on the mixing of tau neutrino to heavy neutrinos

Orloff, J.; Rozanov, Alexandre; Santoni, C.

doi:10.1016/s0370-2693(02)02769-7

Cited by 110 publications

(175 citation statements)

References 26 publications

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“…This scenario is very strongly constrained (see, for example, Refs. [2][3][4][5][94][95][96][97][98][99][100][101]). However, constraints using the ν 4 decay products are model-specific.…”

Section: Global Combination and Discussionmentioning

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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“…This scenario is very strongly constrained (see, for example, Refs. [2][3][4][5][94][95][96][97][98][99][100][101]). However, constraints using the ν 4 decay products are model-specific.…”

Section: Global Combination and Discussionmentioning

confidence: 99%

Global constraints on a heavy neutrino

2016

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“…9 shows the allowed region of M N -|Θ τ | 2 plane. The upper-filled regions are excluded by CHARM [37] and DELPHI [38] at 90% and 95% CL, respectively. The lowerfilled region is the regime where the lifetime of the heavy neutrino is longer than 0.1 s.…”

Section: Implications Of θ τ =mentioning

confidence: 99%

Heavy neutrino search in accelerator-based experiments

Asaka

Eijima

Watanabe

2013

J. High Energ. Phys.

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We explore the feasibility of detecting heavy neutrinos by the existing facilities of neutrino experiments. A heavy neutrino in the mass range 1 MeV M N 500 MeV is produced by pion or kaon decay, and decays to charged particles which leave signals in neutrino detectors. Taking the T2K experiment as a typical example, we estimate the heavy neutrino flux produced in the neutrino beam line. Due to massive nature of the heavy neutrino, the spectrum of the heavy neutrino is significantly different from that of the ordinary neutrinos. While the ordinary neutrinos are emitted to various directions in the laboratory frame due to their tiny masses, the heavy neutrinos tend to be emitted to the forward directions and frequently hit the detector. The sensitivity for the mixing parameters is studied by evaluating the number of signal events in the near detector ND280. For the electron-type mixing, the sensitivity of T2K at 10 21 POT is found to be better than that of the previous experiment PS191, which has placed the most stringent bounds on the mixing parameters of the heavy neutrinos for 140 MeV M N 500 MeV. IntroductionIn the last few decades, neutrino oscillation experiments have conclusively shown that neutrinos are massive [1]. The minimal version of the Standard Model is thus to be extended to accommodate the neutrino masses. In many possible extension of the Standard Model, neutral heavy leptons are often predicted. In the seesaw mechanism [2] for example, the right-handed neutrinos are introduced and they weakly mix with the ordinary neutrinos after the electroweak symmetry breaking.For the masses of the heavy neutrinos, a wide range of possibilities has been discussed in literature. In the canonical picture of the seesaw mechanism, heavy neutrino masses are supposed to be around the grand unification scale. These super-heavy neutrinos can account for the baryon asymmetry of the universe by the leptogenesis [3]. Another possibility to account for the baryon asymmetry has been suggested in [4,5] and further studied in [6]. In this scenario, two quasi-degenerate heavy neutrinos of O(100) MeV −O(10) GeV play a crucial role in the early universe. Heavy neutrinos in the mass range ∼ 0.2 GeV could enhance the energy transport from the core to the stalled shock and favor the supernova explosion [7]. Heavy neutrinos with a few keV mass have also attracted much interests as a viable dark matter candidate [8] and an agent of the pulsar velocities [9].Remarkably, the dark matter and the baryon asymmetry due to keV and GeV heavy neutrinos can originate in a simple framework so called νMSM [10,5], which is an extension of the Standard Model with just three generations of the right-handed neutrinos.Besides the super-heavy range much larger than TeV, such heavy neutrinos can be tested in existing and forthcoming experiments due to lower threshold energies of production (for example, see Ref. [11,12] and references therein).In this paper, we focus on the heavy neutrinos produced by kaon decays. The previous neutrino exper...

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“…If kinematically accessible, sterile neutrinos can be produced in laboratory experiments via the interactions in (A.1): the negative observation of these processes constraints the mixings with the electron [96- [108,109,[116][117][118][119][120][121] flavours. Moreover, and other than requiring compatibility between the left-handed lepton mixing matrixŨ PMNS and the corresponding best-fit intervals 14 defined from ν-oscillation data [1-8], we also impose, when relevant, unitarity bounds as arising from non-standard neutrino interactions with matter, on the deviation ofŨ PMNS from unitarity [125][126][127].…”

Section: A3 Constraints On Sterile Fermionsmentioning

confidence: 99%

Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays

Abada

Romeri

Lucente

et al. 2018

J. High Energ. Phys.

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An observation of any lepton number violating process will undoubtedly point towards the existence of new physics and indirectly to the clear Majorana nature of the exchanged fermion. In this work, we explore the potential of a minimal extension of the Standard Model via heavy sterile fermions with masses in the [0.1 − 10] GeV range concerning an extensive array of "neutrinoless" meson and tau decay processes. We assume that the Majorana neutrinos are produced on-shell, and focus on three-body decays. We conduct an update on the bounds on the active-sterile mixing elements, |U α4 U β 4 |, taking into account the most recent experimental bounds (and constraints) and new theoretical inputs, as well as the effects of a finite detector, imposing that the heavy neutrino decay within the detector. This allows to establish up-to-date comprehensive constraints on the sterile fermion parameter space. Our results suggest that the branching fractions of several decays are close to current sensitivities (likely within reach of future facilities), some being already in conflict with current data (as is the case of K + → + α + β π − , and τ − → µ + π − π − ). We use these processes to extract constraints on all entries of an enlarged definition of a 3 × 3 "effective" Majorana neutrino mass matrix m αβ ν .

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Limits on the mixing of tau neutrino to heavy neutrinos

Cited by 110 publications

References 26 publications

Global constraints on a heavy neutrino

Global constraints on a heavy neutrino

Heavy neutrino search in accelerator-based experiments

Effective Majorana mass matrix from tau and pseudoscalar meson lepton number violating decays

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