Improved search for heavy neutrinos in the decay 
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Aguilar-Arevalo, A. A.; Aoki, M.; Blecher, M.; Britton, D.; Bruch, Dorothea Vom; Bryman, D. A.; Chen, S.; Comfort, J.R.; Cuen-Rochin, S.; Doria, L.; Gumplinger, P.; Hussein, A.; Igarashi, Y.; Ito, S.; Kettell, S. H.; Kurchaninov, L. L.; Littenberg, L.; Malbrunot, C.; Mischke, R. E.; Numao, T.; Protopopescu, D.; Sher, A.; Sullivan, T.; Vavilov, D. V.

doi:10.1103/physrevd.97.072012

Cited by 91 publications

(93 citation statements)

References 27 publications

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“…1: 90 % C.L. upper limits on |Ue4| 2 vs. mν 4 from various souces: PIBETA, pion beta decay (this work); BD1, previous limits from nuclear beta decay [41]; BD2, nuclear beta decay, based on our analysis using [64] and [65]; PIENU and PIENU-H, the ratio BR(π + →e + νe) BR(π + →µ + νµ) in the kinematically allowed and forbidden regions for ν4 emission [90]; πe2 PIENU, π + → e + ν4 peak searches (upper and lower curves from [84] and [91], respectively); KENU and KENU-H, the ratio BR(K + →e + νe) BR(K + →µ + νµ) in the kinematically allowed and forbidden regions for ν4 emission; Ke2 KEK, K + → e + ν4 peak search [82]; Ke2 NA62, K + → e + ν4 peak search [94]; and Ke2 NA62*, the preliminary upper limit from a K + → e + ν4 peak search [95]. Other bounds are denoted Dse2, from our analysis of…”

Section: Limit On Emission Of Massive Neutrinos In Nuclear Beta Dmentioning

confidence: 99%

“…Recent bounds from π ℓ2 and K ℓ2 peak search experiments include those from the searches for π + → e + ν h and π + → µ + ν h decays by the PIENU experiment at TRIUMF [90,91,96], for K + → µ + ν h decay in the E949 experiment at BNL [89], and for the K + → µ + ν h and K + → e + ν h decays in the NA62 experiment at CERN [93][94][95], where ν h ≡ ν 4 in our notation. From the various π e2 , π µ2 , K e2 , and K µ2 peak search experiments, some upper bounds include [90,91]; [89]; and,…”

Section: Constraints From Peak Search Experimentsmentioning

confidence: 99%

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Constraints on sterile neutrinos in the MeV to GeV mass range

2019

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A detailed discussion is given of the analysis of recent data to obtain improved upper bounds on the couplings |Ue4| 2 and |Uµ4| 2 for a mainly sterile neutrino mass eigenstate ν4. Using the excellent agreement among Ft values for superallowed nuclear beta decay, an improved upper limit is derived for emission of a ν4. The agreement of the ratios of branching ratios R (π) e/µ = BR(π + → e + νe)/BR(π + → µ + νµ), R (K) e/µ , R (Ds) e/τ , R (Ds) µ/τ , and R (D)e/τ , and the branching ratios BR(B + → e + νe) and BR(B + → µ + νµ) decays with predictions of the Standard Model, is utilized to derive new constraints on ν4 emission covering the ν4 mass range from MeV to GeV. We also discuss constraints from peak search experiments probing for emission of a ν4 via lepton mixing, as well as constraints from pion beta decay, CKM unitarity, µ decay, leptonic τ decay, and other experimental inputs.

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Section: Limit On Emission Of Massive Neutrinos In Nuclear Beta Dmentioning

confidence: 99%

Section: Constraints From Peak Search Experimentsmentioning

confidence: 99%

Constraints on sterile neutrinos in the MeV to GeV mass range

2019

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“…Depending on these limits the new (heavy) neutrinos added to the active (light) neutrinos may have masses at different ranges none of which has been so far excluded from the experiment. It should be noted that if the physics of the 3-4-1 model is at around TeV scale, such as that of the LHC and near future accelerators, there may exist light heavy neutrinos (at an eV-keV scale) attracting great interest in particle physics and cosmology (see, for example, [49][50][51][52][53]). For M N at the order of 10 2 GeV considered in [48] the scale of physics of 3-4-1 model, if existing, would be too high in order to be discovered at the LHC and other present accelerators.…”

Section: Resultsmentioning

confidence: 99%

Neutrino masses in an $$SU(4)\otimes U(1)$$-electroweak model with a scalar decuplet

Vân

Dinh

et al. 2019

Eur. Phys. J. C

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A neutrino mass model is suggested within an SU (4) × U (1) -electroweak theory. The smallness of neutrino masses can be guaranteed by a seesaw mechanism realized through Yukawa couplings to a scalar SU (4)-decuplet. In this scheme the light active neutrinos are accompanied by heavy neutrinos, which may have masses at different scales, including those within eV-MeV scales investigated quite intensively in both particle physics and astrophysics/cosmology. The flavour neutrinos are superpositions of light neutrinos and a small fraction of heavy neutrinos with the mixing to be determined by the model's parameters (Yukawa coupling coefficients or symmetry breaking scales). The distribution shape of the Yukawa couplings can be visualized via a model-independent distribution of the neutrino mass matrix elements derived by using the current experimental data. The absolute values of these Yukawa couplings are able to be determined if the symmetry breaking scales are known, and vice versa. With reference to several current and near future experiments, detectable bounds of these heavy neutrinos at different mass scales are discussed and estimated.

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“…Utilising the helicity suppression of the π → eν decay channel in comparision to π → µν channel, the presence of N induces extra peaks in the lower positron energy region. Improving on previous results limited by the background µ + → e + ν eνµ , the collaboration set limits at the level of |V N | 2 10 −8 in the range 60 MeV < m N < 129 MeV [84][85][86].…”

Section: Meson Decays and Beam-dump Experimentsmentioning

confidence: 99%

“…• Accelerated neutrino beam experiments have conducted a variety of parallel searches. The CHARM [93,94] and PS191 [95] experiments and the IHEP-JINR neutrino detector [84,96] searched for a small fraction of N in a predominantly ν µ beam. The beams were produced by colliding a primary beam of protons with an iron or copper fixed target, with the hadronic products decaying as π/K/D → ν(N ) ( = e, µ).…”

Section: Meson Decays and Beam-dump Experimentsmentioning

confidence: 99%

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

Bolton

Deppisch

Dev³

2020

J. High Energ. Phys.

171

138

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We make a comparative study of the neutrinoless double beta decay constraints on heavy sterile neutrinos versus other direct and indirect constraints from both lepton number conserving and violating processes, as a sensitive probe of the extent of lepton number violation and possible interference effects in the sterile sector. To this effect, we introduce a phenomenological parametrisation of the simplified one-generation seesaw model with one active and two sterile neutrino states in terms of experimentally measurable quantities, such as active-sterile neutrino mixing angles, CP phases, masses and mass splittings. This simple parametrisation enables us to analytically derive a spectrum of possible scenarios between the canonical seesaw with purely Majorana heavy neutrinos and inverse seesaw with pseudo-Dirac ones. We then go on to constrain the simplified parameters of this model from various experiments in energy, intensity and cosmic frontiers. We emphasise that the constraints from lepton number violating processes strongly depend on the mass splitting between the two sterile states and the relative CP phase between them. This is particularly relevant for the neutrinoless double beta decay constraint, which could now get significantly weaker for small mass splitting and opposite CP parities between the sterile states. It is important to keep this in mind while comparing the neutrinoless double beta decay constraint with the direct search limits in the electron flavour from high-energy colliders.

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Improved search for heavy neutrinos in the decay π→eν

Cited by 91 publications

References 27 publications

Constraints on sterile neutrinos in the MeV to GeV mass range

Constraints on sterile neutrinos in the MeV to GeV mass range

Neutrino masses in an $$SU(4)\otimes U(1)$$-electroweak model with a scalar decuplet

Neutrinoless double beta decay versus other probes of heavy sterile neutrinos

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