Recently, new reactor antineutrino spectra have been provided for $^{235}\mathrm{U}$, $^{239}\mathrm{Pu}$, $^{241}\mathrm{Pu}$, and $^{238}\mathrm{U}$, increasing the mean flux by about 3%. To a good approximation, this reevaluation applies to all reactor neutrino experiments. The synthesis of published experiments at reactor-detector distances $l100\text{ }\text{ }\mathrm{m}$ leads to a ratio of observed event rate to predicted rate of $0.976\ifmmode\pm\else\textpm\fi{}0.024$. With our new flux evaluation, this ratio shifts to $0.943\ifmmode\pm\else\textpm\fi{}0.023$, leading to a deviation from unity at 98.6% C.L. which we call the reactor antineutrino anomaly. The compatibility of our results with the existence of a fourth nonstandard neutrino state driving neutrino oscillations at short distances is discussed. The combined analysis of reactor data, gallium solar neutrino calibration experiments, and MiniBooNE-$\ensuremath{\nu}$ data disfavors the no-oscillation hypothesis at 99.8% C.L. The oscillation parameters are such that $|\ensuremath{\Delta}{m}_{\mathrm{new}}^{2}|g1.5\text{ }\text{ }{\mathrm{eV}}^{2}$ (95%) and ${sin﻿}^{2}(2{\ensuremath{\theta}}_{\mathrm{new}})=0.14\ifmmode\pm\else\textpm\fi{}0.08$ (95%). Constraints on the ${\ensuremath{\theta}}_{13}$ neutrino mixing angle are revised.

Reactor antineutrino anomaly

We review the application of non abelian discrete groups to the theory of neutrino masses and mixing, which is strongly suggested by the agreement of the TriBimaximal (TB) mixing pattern with experiment. After summarizing the motivation and the formalism, we discuss specific models, based on A4, S4 and other finite groups, and their phenomenological implications, including lepton flavor violating processes, leptogenesis and the extension to quarks. In alternative to TB mixing the application of discrete flavor symmetries to quark-lepton complementarity and Bimaximal Mixing (BM) is also considered.

/pdf/discrete-flavor-symmetries-and-models-of-neutrino-mixing-4ba9knxf68.pdf

Discrete Flavor Symmetries and Models of Neutrino Mixing

The theoretical and experimental issues relevant to neutrinoless double beta decay are reviewed. The impact that a direct observation of this exotic process would have on elementary particle physics, nuclear physics, astrophysics, and cosmology is profound. Now that neutrinos are known to have mass and experiments are becoming more sensitive, even the nonobservation of neutrinoless double beta decay will be useful. If the process is actually observed, we will immediately learn much about the neutrino. The status and discovery potential of proposed experiments are reviewed in this context, with significant emphasis on proposals favored by recent panel reviews. The importance of and challenges in the calculation of nuclear matrix elements that govern the decay are considered in detail. The increasing sensitivity of experiments and improvements in nuclear theory make the future exciting for this field at the interface of nuclear and particle physics.

/pdf/double-beta-decay-majorana-neutrinos-and-neutrino-mass-2tfhqvhys8.pdf

Double Beta Decay, Majorana Neutrinos, and Neutrino Mass

Massive neutrinos and cosmology

The present experimental results on neutrino flavour oscillations provide evidence for non-zero neutrino masses, but give no hint on their absolute mass scale, which is the target of beta decay and neutrinoless double-beta decay experiments. Crucial complementary information on neutrino masses can be obtained from the analysis of data on cosmological observables, such as the anisotropies of the cosmic microwave background or the distribution of large-scale structure. In this review we describe in detail how free-streaming massive neutrinos affect the evolution of cosmological perturbations. We summarize the current bounds on the sum of neutrino masses that can be derived from various combinations of cosmological data, including the most recent analysis by the WMAP team. We also discuss how future cosmological experiments are expected to be sensitive to neutrino masses well into the sub-eV range.

The Mainz Neutrino Mass Experiment investigates the endpoint region of the tritium β decay spectrum very precisely to extract the rest mass of the electron antineutrino. The measurements are performed with a MAC-E-Filter, combining agnetic diabatic ollimation and an lectrostatic high pass Filter. After optimal preparation of the apparatus very stable and high quality data have been taken in 2001, which do not show any residual problem. A combined analysis of data from 1998/1999 and 2001 lead to the final value of m
 ν
 2 = –0.7 ± 2.2
 stat
 ± 2.1
 sys
  eV2/c4, leading to an upper limit m
 ν
 ≤ 2.3 eV/c2 (95% C.L.). PACS: 14.60.P Neutrinos, mass and mixing – 23.40 β decay

Latest results of the Mainz Neutrino Mass Experimen

This paper reports on the improved Mainz experiment on tritium $\beta$
 spectroscopy which yields a 10 times higher signal to background ratio than before. The main experimental effects and systematic uncertainties have been investigated in side experiments, and possible error sources have been eliminated. Extensive data taking took place in the years 1997 to 2001. A residual analysis of the data sets yields for the square of the electron antineutrino mass the final result of $m^2(\nu_e) = (-0.6 \pm 2.2_{\mathrm{{stat}}} \pm 2.1_{\mathrm{{syst}}})$
 eV2/c4. We derive an upper limit of $m(\nu_e)\leq 2.3$
 eV/c2 at 95% confidence level for the mass itself.

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

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Latest results of the Mainz Neutrino Mass Experimen

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