44
44
Sep 18, 2013
09/13
by
Marco Laveder
texts
eye 44
favorite 0
comment 0
The NOMAD experiment has been designed to search for neutrino-tau appearance in the CERN wide-band neutrino beam . The detector is now completed and has been further improved. All subdetectors are working well. The experiment, where the search for oscillation is based on kinematical criteria, will reach the sensitivity dm2 > 0.7 eV2 for maximal mixing and dm2 > 50 eV2 for mixing angles sin2 2\theta > 3.8E-4 after 2 years of running, making possible to explore a region of cosmological...
Source: http://arxiv.org/abs/hep-ph/9601342v1
51
51
Sep 23, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 51
favorite 0
comment 0
We present an update of our analysis of short-baseline neutrino oscillation data in the framework of 3+1 neutrino mixing taking into account the recent update of MiniBooNE antineutrino data and the recent results of the MINOS search for nu_mu disappearance into sterile neutrinos (the more complicated 3+2 neutrino mixing is not needed since the CP-violating difference between MiniBooNE neutrino and antineutrino data has diminished). The results of our fits of short-baseline neutrino oscillation...
Source: http://arxiv.org/abs/1109.4033v2
42
42
Sep 19, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 42
favorite 0
comment 0
We suggest the possibility that the anomalies observed in the LSND experiment and the Gallium radioactive source experiments may be due to neutrino oscillations generated by a large squared-mass difference of about 20 - 30 eV^2. We consider the simplest 3+1 four-neutrino scheme that can accommodate also the observed solar and atmospheric neutrino oscillations. We show that, in this framework, the disappearance of nu_e and nu_mu in short-baseline neutrino oscillation experiments is mainly due to...
Source: http://arxiv.org/abs/hep-ph/0610352v2
52
52
Sep 23, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 52
favorite 0
comment 0
We present an upgrade of the 3+1 global fit of short-baseline neutrino oscillation data obtained with the addition of KARMEN and LSND nu_e-Carbon scattering data. We discuss the implications for the measurements of the effective neutrino mass in beta-decay and neutrinoless double-beta-decay experiments. We find respective predicted ranges of about 0.1-0.7 eV and 0.01-0.1 eV.
Source: http://arxiv.org/abs/1111.1069v2
41
41
Sep 21, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 41
favorite 0
comment 0
We analyzed the electron neutrino data of the Gallium radioactive source experiments and the electron antineutrino data of the reactor Bugey and Chooz experiments in terms of neutrino oscillations allowing for a CPT-violating difference of the squared-masses and mixings of neutrinos and antineutrinos. We found that the discrepancy between the disappearance of electron neutrinos indicated by the data of the Gallium radioactive source experiments and the limits on the disappearance of electron...
Source: http://arxiv.org/abs/1008.4750v1
67
67
Jul 19, 2013
07/13
by
Carlo Giunti; Marco Laveder
texts
eye 67
favorite 0
comment 0
We consider the interpretation of the MiniBooNE low-energy anomaly and the Gallium radioactive source experiments anomaly in terms of short-baseline electron neutrino disappearance in the framework of 3+1 four-neutrino mixing schemes. The separate fits of MiniBooNE and Gallium data are highly compatible, with close best-fit values of the effective oscillation parameters Delta m^2 and sin^2 2 theta. The combined fit gives Delta m^2 >~ 0.1 eV^2 and 0.11 < sin^2 2 theta < 0.48 at 2 sigma....
Source: http://arxiv.org/abs/1005.4599v4
53
53
Sep 19, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 53
favorite 0
comment 0
We analyze the recent results of the MiniBooNE short-baseline experiment on antinu_mu -> antinu_e oscillations in a minimal model-independent framework of antineutrino mixing in conjunction with the positive LSND signal and the negative KARMEN measurements. We show that the data of the three short-baseline antinu_mu -> antinu_e experiments are compatible. Taking into account also the model-independent constraints due to the limits on short-baseline antinu_e disappearance obtained in...
Source: http://arxiv.org/abs/1010.1395v2
57
57
Sep 22, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 57
favorite 0
comment 0
In this review we present the main features of the current status of neutrino physics. After a review of the theory of neutrino mixing and oscillations, we discuss the current status of solar and atmospheric neutrino oscillation experiments. We show that the current data can be nicely accommodated in the framework of three-neutrino mixing. We discuss also the problem of the determination of the absolute neutrino mass scale through Tritium beta-decay experiments and astrophysical observations,...
Source: http://arxiv.org/abs/hep-ph/0310238v2
64
64
Sep 23, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 64
favorite 0
comment 0
We analyze the LSND, KARMEN and MiniBooNE data on short-baseline antinu_mu -> antinu_e oscillations and the data on short-baseline antinu_e disappearance obtained in the Bugey-3 and CHOOZ reactor experiments in the framework of 3+1 antineutrino mixing, taking into account the MINOS observation of long-baseline antinu_mu disappearance and the KamLAND observation of very-long-baseline antinu_e disappearance. We show that the fit of the data implies that the short-baseline disappearance of...
Source: http://arxiv.org/abs/1012.0267v3
98
98
Sep 23, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 98
favorite 0
comment 0
We investigate the possible effects of short-baseline antinu_e disappearance implied by the reactor antineutrino anomaly on the Double-Chooz determination of theta_{13} through the normalization of the initial antineutrino flux with the Bugey-4 measurement. We show that the effects are negligible and the value of theta_{13} obtained by the Double-Chooz collaboration is accurate only if Delta m^2_{41} is larger than about 3 eV^2. For smaller values of Delta m^2_{41} the short-baseline...
Source: http://arxiv.org/abs/1111.5211v2
67
67
Sep 23, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 67
favorite 0
comment 0
We calculate the statistical significance of the anomalous deficit of electron neutrinos measured in the radioactive source experiments of the GALLEX and SAGE solar neutrino detectors taking into account the uncertainty of the detection cross section. We found that the statistical significance of the anomaly is about 3.0 sigma. A fit of the data in terms of neutrino oscillations favors at about 2.7 sigma short-baseline electron neutrino disappearance with respect to the null hypothesis of no...
Source: http://arxiv.org/abs/1006.3244v3
53
53
Sep 21, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 53
favorite 0
comment 0
We consider possible indications of Very-Short-BaseLine (VSBL) electron neutrino disappearance into sterile neutrinos in MiniBooNE neutrino data and Gallium radioactive source experiments. We discuss the compatibility of such a disappearance with reactor and MiniBooNE antineutrino data. We find a tension between neutrino and antineutrino data which could be due to: 1) statistical fluctuations; 2) underestimate of systematic uncertainties; 3) exclusion of our hypothesis of VSBL nu_e...
Source: http://arxiv.org/abs/0902.1992v2
59
59
Sep 18, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 59
favorite 0
comment 0
The anomalous excess of low-energy nu_e events measured in the MiniBooNE experiment is explained through a renormalization of the absolute neutrino flux and a simultaneous disappearance of the nu_e's in the beam, which is compatible with that indicated by the results of Gallium radioactive source experiments. We present the results of the fit of MiniBooNE data (P(nu_e->nu_e) = 0.64 +0.08 -0.07) and the combined fit of MiniBooNE data and the nu_e disappearance measured in the Gallium...
Source: http://arxiv.org/abs/0707.4593v3
38
38
Sep 23, 2013
09/13
by
Carlo Giunti; Marco Laveder
texts
eye 38
favorite 0
comment 0
We analyzed the electron neutrino data of the Gallium radioactive source experiments and the electron antineutrino data of the reactor Bugey and Chooz experiments in terms of neutrino oscillations. We found a hint of a CPT-violating asymmetry of the effective neutrino and antineutrino mixing angles.
Source: http://arxiv.org/abs/1012.4356v1
58
58
Jul 20, 2013
07/13
by
Carlo Giunti; Marco Laveder
texts
eye 58
favorite 0
comment 0
We present the results of fits of short-baseline neutrino oscillation data in 3+1 and 3+2 neutrino mixing schemes. In spite of the presence of a tension in the interpretation of the data, 3+1 neutrino mixing is attractive for its simplicity and for the natural correspondence of one new entity (a sterile neutrino) with a new effect (short-baseline oscillations). The allowed regions in the oscillation parameter space can be tested in near-future experiments. In the framework of 3+2 neutrino...
Source: http://arxiv.org/abs/1107.1452v3
49
49
Sep 17, 2013
09/13
by
Mario A. Acero; Carlo Giunti; Marco Laveder
texts
eye 49
favorite 0
comment 0
The deficit observed in the Gallium radioactive source experiments is interpreted as a possible indication of the disappearance of electron neutrinos. In the effective framework of two-neutrino mixing we obtain $\sin^{2}2\vartheta \gtrsim 0.03$ and $\Delta{m}^{2} \gtrsim 0.1 \text{eV}^{2}$. The compatibility of this result with the data of the Bugey and Chooz reactor short-baseline antineutrino disappearance experiments is studied. It is found that the Bugey data present a hint of neutrino...
Source: http://arxiv.org/abs/0711.4222v3
7
7.0
Jun 29, 2018
06/18
by
Francesco Capozzi; Carlo Giunti; Marco Laveder; Antonio Palazzo
texts
eye 7
favorite 0
comment 0
Recent studies have evidenced that long-baseline (LBL) experiments are sensitive to the extra CP-phases involved with light sterile neutrinos, whose existence is suggested by several anomalous short-baseline (SBL) results. We show that, within the 3+1 scheme, the combination of the existing SBL data with the LBL results coming from the two currently running experiments NO$\nu$A and T2K, enables us to simultaneously constrain two active-sterile mixing angles $\theta_{14}$ and $\theta_{24}$ and...
Topics: Instrumentation and Detectors, High Energy Physics - Phenomenology, Physics, High Energy Physics -...
Source: http://arxiv.org/abs/1612.07764
47
47
Sep 23, 2013
09/13
by
Jostein R. Kristiansen; Øystein Elgarøy; Carlo Giunti; Marco Laveder
texts
eye 47
favorite 0
comment 0
There are hints, both from cosmology and from neutrino oscillation experiments, that one or two sterile neutrinos with eV masses are favored. We consider the implications of combining data from short baseline neutrino experiments with cosmological observations. In particular we consider cosmological models where the equation of state of dark energy and the curvature are allowed to vary. We find that the consistency of results from short baseline experiments and cosmology is dependent on the...
Source: http://arxiv.org/abs/1303.4654v1
3
3.0
Jun 30, 2018
06/18
by
Maria Archidiacono; Nicolao Fornengo; Stefano Gariazzo; Carlo Giunti; Steen Hannestad; Marco Laveder
texts
eye 3
favorite 0
comment 0
The recent discovery of B-modes in the polarization pattern of the Cosmic Microwave Background by the BICEP2 experiment has important implications for neutrino physics. We revisit cosmological bounds on light sterile neutrinos and show that they are compatible with all current cosmological data provided that the mass is relatively low. Using CMB data, including BICEP-2, we find an upper bound of $m_s < 0.85$ eV ($2\sigma$ Confidence Level). This bound is strengthened to 0.48 eV when HST...
Topics: High Energy Physics - Phenomenology, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1404.1794
10
10.0
Jun 29, 2018
06/18
by
Maria Archidiacono; Stefano Gariazzo; Carlo Giunti; Steen Hannestad; Rasmus Hansen; Marco Laveder; Thomas Tram
texts
eye 10
favorite 0
comment 0
The Short BaseLine (SBL) neutrino oscillation anomalies hint at the presence of a sterile neutrino with a mass of around 1 eV. However, such a neutrino is incompatible with cosmological data, in particular observations of the Cosmic Microwave Background (CMB) anisotropies. However, this conclusion can change by invoking new physics. One possibility is to introduce a secret interaction in the sterile neutrino sector mediated by a light pseudoscalar. In this pseudoscalar model, CMB data prefer a...
Topics: Astrophysics, High Energy Physics - Phenomenology, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1606.07673
54
54
Sep 19, 2013
09/13
by
Rodrigo Alonso; Stefan Antusch; Mattias Blennow; Pilar Coloma; Andre de Gouvea; Enrique Fernandez-Martinez; Belen Gavela; Concha Gonzalez-Garcia; Sergio Hortner; Marco Laveder; Tracey Li; Jacobo Lopez-Pavon; Michele Maltoni; Olga Mena; Pasquale Migliozzi; Toshihiko Ota; Sergio Palomares Ruiz; Adam Para; Stephen J. Parke; Nuria Rius; Thomas Schwetz-Mangold; F. J. P. Soler; Michel Sorel; Osamu Yasuda; Walter Winter
texts
eye 54
favorite 0
comment 0
Recent developments on tau detection technologies and the construction of high intensity neutrino beams open the possibility of a high precision search for non-standard {\mu} - {\tau} flavour transition with neutrinos at short distances. The MINSIS - Main Injector Non-Standard Interaction Search- is a proposal under discussion to realize such precision measurement. This document contains the proceedings of the workshop which took place on 10-11 December 2009 in Madrid to discuss both the...
Source: http://arxiv.org/abs/1009.0476v1
