The Mainz neutrino mass experiment

Bonn, J.; Bornschein, B.; Bornschein, L.; Fickinger, L.; Flatt, B.; Kazachenko, O.; Kovalı́k, A.; Kraus, Ch.; Otten, Ernst W.; Schall, Judith; Ulrich, H.; Weinheimer, C.

doi:10.1016/s0920-5632(00)00951-8

Cited by 151 publications

(39 citation statements)

References 14 publications

(8 reference statements)

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“…The present upper limit is m νe < 2.2 eV at 95% confidence level (CL) [28,29], while a new experimental project, KA-TRIN [30], is underway, with an estimated sensitivity limit m νe ∼ 0.2 eV. However, cosmological observations provide the tightest constraints on the absolute scale of neutrino masses, via their contribution to the energy density of the Universe and the growth of structure.…”

Section: Framework and Reviewmentioning

confidence: 99%

Neutrino masses from new generations

Aparici

Herrero-García

Rius

et al. 2011

J. High Energ. Phys.

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We reconsider the possibility that Majorana masses for the three known neutrinos are generated radiatively by the presence of a fourth generation and one right-handed neutrino with Yukawa couplings and a Majorana mass term. We find that the observed light neutrino mass hierarchy is not compatible with low energy universality bounds in this minimal scenario, but all present data can be accommodated with five generations and two right-handed neutrinos. Within this framework, we explore the parameter space regions which are currently allowed and could lead to observable effects in neutrinoless double beta decay, $\mu - e$ conversion in nuclei and $\mu \rightarrow e \gamma$ experiments. We also discuss the detection prospects at LHC.Comment: 28 pages, 4 figures. Version to be published. Some typos corrected. Improved figures 3 and

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Section: Framework and Reviewmentioning

confidence: 99%

Neutrino masses from new generations

Aparici

Herrero-García

Rius

et al. 2011

J. High Energ. Phys.

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“…First of all, if the inverted ordering is the case, the observed value of m ee in 0νββ decay experiment must be larger than the value given in Eq. (25), as already mentioned in Sec. III.…”

Section: Dependence On the Lightest Neutrino Mass And θ 13mentioning

confidence: 52%

“…The absolute neutrino mass scale is also independently constrained by the tritium decay experiments, which can directly measure the electron neutrino mass, obtaining the upper bound [25] m νe < 2200 meV.…”

Section: Introductionmentioning

confidence: 99%

Constraining the absolute neutrino mass scale and MajoranaCPviolating phases by future0νββdecay experiments

2002

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Assuming that neutrinos are Majorana particles, in a three generation framework, current and future neutrino oscillation experiments can determine six out of the nine parameters which fully describe the structure of the neutrino mass matrix. We try to clarify the interplay among the remaining parameters, the absolute neutrino mass scale and two CP violating Majorana phases, and how they can be accessed by future neutrinoless double beta (0νββ) decay experiments, for the normal as well as for the inverted order of the neutrino mass spectrum. Assuming the oscillation parameters to be in the range presently allowed by atmospheric, solar, reactor and accelerator neutrino experiments, we quantitatively estimate the bounds on m 0 , the lightest neutrino mass, that can be inferred if the next generation 0νββ decay experiments can probe the effective Majorana mass (m ee ) down to ∼ 1 meV. In this context we conclude that in the case neutrinos are Majorana particles: (a) if m 0 > ∼ 300 meV, i.e., within the range directly attainable by future laboratory experiments as well as astrophysical observations, then m ee > ∼ 30 meV must be observed; (b) if m 0 < 300 meV, results from future 0νββ decay experiments combined with stringent bounds on the neutrino oscillation parameters, specially the solar ones, will place much stronger limits on the allowed values of m 0 than these direct experiments. For instance, if a positive signal is observed around m ee = 10 meV, we estimate 3 < ∼ m 0 /meV < ∼ 65 at 95 % C.L.; on the other hand, if no signal is observed down to m ee = 10 meV, then m 0 < ∼ 55 meV at 95 % C.L.

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“…We perform Monte Carlo analyses where we randomize over a set of values for (R,ỹ 1 ,ỹ 2 , δ 1 , δ 2 , M 2 * σ). The physical constraints consist of the CP violation bound −1.6 × 10 −6 < ε < −1.6 × 10 −7 , the condition that the heavy neutrino decay rate must be less than the expansion rate of the Universe, Γ H and the experimental bound on the electron neutrino mass m νe 2.2 eV [19]. The washout factor κ in Y L = κε/g * is estimated to be 0.01-0.1 [20]- [22], which gives the above mentioned constraint −1.6 × 10 −6 < ε < −1.6 × 10 −7 for the CP violation parameter.…”

Section: Numerical Analysismentioning

confidence: 99%

Numerical study of leptogenesis in a 5D split fermion model with bulk neutrinos

2011

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We study numerically a 5D hybrid model which incorporates a split fermion scenario and bulk neutrinos. We perform a Monte Carlo analysis of the model in order to find the regions in the parameter space allowing for realization of the leptogenesis. We find that higher order Yukawa terms must be included in order the model to produce a CP violation and net baryon number sufficient for the creation of the observed baryon asymmetry of the Universe.

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The Mainz neutrino mass experiment

Cited by 151 publications

References 14 publications

Neutrino masses from new generations

Neutrino masses from new generations

Constraining the absolute neutrino mass scale and MajoranaCPviolating phases by future0νββdecay experiments

Numerical study of leptogenesis in a 5D split fermion model with bulk neutrinos

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