High precision measurement of the tritium β spectrum near its endpoint and upper limit on the neutrino mass

Weinheimer, C.; Degenddag, B.; Bleile, A.; Bonn, J.; Bornschein, L.; Kazachenko, O.; Kovalı́k, A.; Otten, E.

doi:10.1016/s0370-2693(99)00780-7

Cited by 210 publications

(116 citation statements)

References 11 publications

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“…Choosing v and m 1D 1 eV (corresponding to the scale of upper bounds derived from 3 H -decay studies [21,22]) leads to the bounds in the first row of Table I. Similar arguments yield the other entries in the table.…”

Section: Neutrino-mass Constraintsmentioning

confidence: 71%

Neutrino mass implications for muon decay parameters

et al. 2007

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We use the scale of neutrino mass and naturalness considerations to obtain model-independent expectations for the magnitude of possible contributions to muon decay Michel parameters from new physics above the electroweak symmetry-breaking scale. Focusing on Dirac neutrinos, we obtain a complete basis of dimension four and dimension six effective operators that are invariant under the gauge symmetry of the standard model and that contribute to both muon decay and neutrino mass. We show that -in the absence of fine tuning-the most stringent neutrino-mass naturalness bounds on chiralitychanging vector operators relevant to muon decay arise from one-loop operator mixing. The bounds we obtain on their contributions to the Michel parameters are 2 orders of magnitude stronger than bounds previously obtained in the literature. In addition, we analyze the implications of one-loop matching considerations and find that the expectations for the size of various scalar and tensor contributions to the Michel parameters are considerably smaller than derived from previous estimates of two-loop operator mixing. We also show, however, that there exist gauge-invariant operators that generate scalar and tensor contributions to muon decay but whose flavor structure allows them to evade neutrino-mass naturalness bounds. We discuss the implications of our analysis for the interpretation of muon-decay experiments.

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Section: Neutrino-mass Constraintsmentioning

confidence: 71%

Neutrino mass implications for muon decay parameters

et al. 2007

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“…The most recent experiments to use the MAC-E technique are the Mainz and Troitsk experiments. They placed similar limits on the neutrino mass: m β ν < 2.3 eV [4,5]. A more recent analysis of the Troitsk data lowered that limit to m β ν < 2.1 eV [6].…”

Section: Introductionmentioning

confidence: 81%

Katrin

Oblath¹

2014

Proceedings of XV International Workshop on Neutrino Telescopes — PoS(Neutel 2013)

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The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to measure the neutrino mass using tritium beta decays. It is currently under construction and commissioning at the Karlsruhe Institute of Technology in Karlsruhe, Germany. The use of a high-luminosity, gaseous source and a large, high-precision spectrometer will allow KATRIN to discover a neutrino mass as small as 350 meV, or place an upper limit at 200 meV. The status of the various components of the KATRIN experiment will be described in this report.

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“…Direct observational bounds on neutrino masses, found kinematically, are: m ν e < 10 eV (Weinheimer et al 1999;Lobashev et al 1999;Particle Data Group 2000); m ν τ < 170 keV (Assmagan et al 1996); and m ν τ < 18 MeV (Buskulic et al 1995;Passalacqua 1997). In the absence of degeneracy, e-neutrinos decouple at K B T D (ν e ) ≈ 2.0 MeV, and μ and τ neutrinos at Freese et al 1983).…”

Section: Dependence On M Of the Degeneracy Of A Cosmological Backgroumentioning

confidence: 99%

Mass limits for dark clusters of degenerate fermions

Membrado

Pacheco

2013

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We calculate the range of possible masses for dark spheres of bound fully degenerate fermions as a function of the fermion mass. The cosmological constant is included in our calculations. We deduce that the minimum fermion mass that is able to give rise to degenerate fermion clusters is ∼0.02 g −1/4 eV, where g is the spin degeneracy parameter. We show that degenerate fermions of mc 2 ≈ (15−30) g −1/4 eV can build bound degenerate dark haloes that could reproduce the values of the rotation velocities of galaxies. The masses and radii derived for these degenerate dark haloes of typical galaxies, without considering any cosmological information, agree with the Jeans masses and radii of a cosmological background of ∼(20−30) g −1/4 eV degenerate fermions at redshift z ≈ 50. However, degenerate fermion objects of 10 15 M composed of these particles are too small to constitute the dark halo of galaxy clusters. We also derive degeneracy conditions for hot and cold dark matter fermions.

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High precision measurement of the tritium β spectrum near its endpoint and upper limit on the neutrino mass

Cited by 210 publications

References 11 publications

Neutrino mass implications for muon decay parameters

Neutrino mass implications for muon decay parameters

Katrin

Mass limits for dark clusters of degenerate fermions

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