Final results from phase II of the Mainz neutrino mass searchin tritium 
                
                  
                
                ${\beta}$
               decay

Kraus, Ch.; Bornschein, B.; Bornschein, L.; Bonn, J.; Flatt, B.; Kovalı́k, A.; Ostrick, B.; Otten, Ernst W.; Schall, Judith; Thümmler, T.; Weinheimer, C.

doi:10.1140/epjc/s2005-02139-7

Cited by 594 publications

(399 citation statements)

References 52 publications

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“…Existing beta decay experiments extract limits on an effective electron neutrino mass m 2 νe = i |U ei | 2 m 2 i [55], provided that the neutrino masses are smaller than the detector energy resolution. Currently the most stringent bounds on m 2 νe are (2.3) 2 eV 2 at 95% confidence from the Mainz experiment [56] and (2.5) 2 eV 2 at 95% confidence from the Troitsk experiment [57]. In the next few years the Katrin experiment should exceed these limits by nearly two orders of magnitude, probing down to (0.2) 2 eV 2 at the 90% confidence level [58].…”

Section: A Tritium Beta-decaymentioning

confidence: 99%

Neutrino phenomenology of very low-energy seesaw scenarios

2007

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The Standard Model augmented by the presence of gauge-singlet right-handed neutrinos proves to be an ideal scenario for accommodating nonzero neutrino masses. Among the new parameters of this "New Standard Model" are right-handed neutrino Majorana masses M . Theoretical prejudice points to M much larger than the electroweak symmetry breaking scale, but it has recently been emphasized that all M values are technically natural and should be explored. Indeed, M around 1 − 10 eV can accommodate an elegant oscillation solution to the LSND anomaly, while other M values lead to several observable consequences. We consider the phenomenology of low energy (M 1 keV) seesaw scenarios. By exploring such a framework with three right-handed neutrinos, we can consistently fit all oscillation data -including those from LSND -while partially addressing several astrophysical puzzles, including anomalous pulsar kicks, heavy element nucleosynthesis in supernovae, and the existence of warm dark matter. Furthermore, low-energy seesaws -regardless of their relation to the LSND anomaly -can also be tested by future tritium beta-decay experiments, neutrinoless double-beta decay searches, and other observables. We estimate the sensitivity of such probes to M .

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Section: A Tritium Beta-decaymentioning

confidence: 99%

Neutrino phenomenology of very low-energy seesaw scenarios

2007

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“…for quasi-degenerate neutrinos. As can be seen, to generate values of |U e3 | within the range of interest, neutrino masses should exceed the direct limit of 2.3 eV from tritium decay [32], and hence also the more stringent but model-dependent limits from cosmology. We conclude that a high scale value of θ 13 = 0 is incompatible with the indicated range of |U e3 |.…”

Section: Breaking Tri-bimaximal Mixing With Quantum Correctionsmentioning

confidence: 99%

Large|Ue3|and tribimaximal mixing

et al. 2009

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We investigate in a model-independent way to what extent one can perturb tri-bimaximal mixing in order to generate a sizable value of |U e3 |, while at the same time keeping solar neutrino mixing near its measured value, which is close to sin 2 θ 12 = 1 3 . Three straightforward breaking mechanisms to generate |U e3 | ≃ 0.1 are considered. For charged lepton corrections, the suppression of a sizable contribution to sin 2 θ 12 can be achieved if CP violation in neutrino oscillations is almost maximal. Generation of the indicated value of |U e3 | ≃ 0.1 through renormalization group corrections requires the neutrinos to be quasi-degenerate in mass. The consistency with the allowed range of sin 2 θ 12 together with large running of |U e3 | forces one of the Majorana phases to be close to π. This implies large cancellations in the effective Majorana mass governing neutrino-less double beta ((ββ) 0ν -)decay, constraining it to lie near its minimum allowed value of m 0 cos 2θ 12 , where m 0 > ∼ 0.1 eV. Finally, explicit breaking of the neutrino mass matrix in the inverted hierarchical and quasi-degenerate neutrino mass spectrum cases is similarly correlated with the (ββ) 0ν -decay effective Majorana mass, although to a lesser extent. The implied values for the atmospheric neutrino mixing angle θ 23 are given in all cases.

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“…The current best limit on ν e mass from direct measurement is m< 2.2 eV (95%CL) [10]. An even more stringent limit comes from cosmology, from which it follows that the sum of masses of the three neutrinos m ν < 0.61 eV (95%CL) [11].…”

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confidence: 99%

Observation of Disappearance of Muon Neutrinos in the NuMI Beam

Pavlović¹

2008

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Final results from phase II of the Mainz neutrino mass searchin tritium ${\beta}$ decay

Cited by 594 publications

References 52 publications

Neutrino phenomenology of very low-energy seesaw scenarios

Neutrino phenomenology of very low-energy seesaw scenarios

Large|Ue3|and tribimaximal mixing

Observation of Disappearance of Muon Neutrinos in the NuMI Beam

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