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3.0
Jun 30, 2018
06/18
Jun 30, 2018
by
Carlo Giunti
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We consider the possibility that the reactor antineutrino anomaly is due to a miscalculation of one or more of the $^{235}\text{U}$, $^{238}\text{U}$, $^{239}\text{Pu}$, and $^{241}\text{Pu}$ reactor antineutrino fluxes. From the fit of the data we obtain the precise determination $\sigma_{f,235} = ( 6.33 \pm 0.08 ) \times 10^{-43} \, \text{cm}^2 / \text{fission}$ of the $^{235}\text{U}$ cross section per fission, which is more precise than the calculated value and differs from it by...
Topics: High Energy Physics - Experiment, High Energy Physics - Phenomenology, Nuclear Experiment
Source: http://arxiv.org/abs/1702.04139
2
2.0
Jun 30, 2018
06/18
Jun 30, 2018
by
Maria Archidiacono; Nicolao Fornengo; Stefano Gariazzo; Carlo Giunti; Steen Hannestad; Marco Laveder
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eye 2
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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
2
2.0
Jun 30, 2018
06/18
Jun 30, 2018
by
Carlo Giunti; Alexander Studenikin
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eye 2
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We review the theory and phenomenology of neutrino electromagnetic interactions, which give us powerful tools to probe the physics beyond the Standard Model. After a derivation of the general structure of the electromagnetic interactions of Dirac and Majorana neutrinos in the one-photon approximation, we discuss the effects of neutrino electromagnetic interactions in terrestrial experiments and in astrophysical environments. We present the experimental bounds on neutrino electromagnetic...
Topics: High Energy Physics - Phenomenology, Astrophysics, Solar and Stellar Astrophysics, High Energy...
Source: http://arxiv.org/abs/1403.6344
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5.0
Jun 29, 2018
06/18
Jun 29, 2018
by
Francesco Capozzi; Carlo Giunti; Marco Laveder; Antonio Palazzo
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eye 5
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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
4
4.0
Jun 29, 2018
06/18
Jun 29, 2018
by
Carlo Giunti
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eye 4
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The current status of the phenomenology of short-baseline neutrino oscillations induced by light sterile neutrinos in the framework of 3+1 mixing is reviewed.
Topics: Astrophysics, High Energy Physics - Phenomenology, Cosmology and Nongalactic Astrophysics, High...
Source: http://arxiv.org/abs/1609.04688
4
4.0
Jun 29, 2018
06/18
Jun 29, 2018
by
Carlo Giunti
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eye 4
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We investigate which among the reactor antineutrino fluxes from the decays of the fission products of $^{235}\text{U}$, $^{238}\text{U}$, $^{239}\text{Pu}$, and $^{241}\text{Pu}$ may be responsible for the reactor antineutrino anomaly if the anomaly is due to a miscalculation of the antineutrino fluxes. We find that it is very likely that at least the calculation of the $^{235}\text{U}$ flux must be revised. From the fit of the data we obtain the precise determination $\sigma_{f,235} = ( 6.33...
Topics: Nuclear Theory, High Energy Physics - Phenomenology, Nuclear Experiment, High Energy Physics -...
Source: http://arxiv.org/abs/1608.04096
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9.0
Jun 29, 2018
06/18
Jun 29, 2018
by
Maria Archidiacono; Stefano Gariazzo; Carlo Giunti; Steen Hannestad; Rasmus Hansen; Marco Laveder; Thomas Tram
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eye 9
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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
2
2.0
Jun 28, 2018
06/18
Jun 28, 2018
by
Carlo Giunti
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eye 2
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The indications in favor of the existence of light sterile neutrinos at the eV scale found in short-baseline neutrino oscillation experiments is reviewed. The future perspectives of short-baseline neutrino oscillation experiments and the connections with beta-decay measurements of the neutrino masses and with neutrinoless double-beta decay experiments are discussed.
Topics: High Energy Physics - Experiment, Cosmology and Nongalactic Astrophysics, Astrophysics, High Energy...
Source: http://arxiv.org/abs/1512.04758
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16
Jun 28, 2018
06/18
Jun 28, 2018
by
Carlo Giunti; Konstantin A. Kouzakov; Yu-Feng Li; Alexey V. Lokhov; Alexander I. Studenikin; Shun Zhou
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eye 16
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An overview of neutrino electromagnetic properties, which open a door to the new physics beyond the Standard Model, is given. The effects of neutrino electromagnetic interactions both in terrestrial experiments and in astrophysical environments are discussed. The experimental bounds on neutrino electromagnetic characteristics are summarized. Future astrophysical probes of electromagnetic neutrinos are outlined.
Topic: High Energy Physics - Phenomenology
Source: http://arxiv.org/abs/1506.05387
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41
Sep 24, 2013
09/13
Sep 24, 2013
by
Carlo Giunti
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eye 41
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The phenomenology of absolute neutrino masses is reviewed, focusing on tritium beta decay, cosmological measurements and neutrinoless double-beta decay.
Source: http://arxiv.org/abs/hep-ph/0412148v1
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56
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti
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eye 56
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The standard theory of neutrino oscillations is reviewed, highlighting the main assumptions: the definition of the flavor states, the equal-momentum assumption and the time = distance assumption. It is shown that the standard flavor states are correct approximations of the states that describe neutrinos in oscillation experiments. The equal-momentum assumption is shown to be unnecessary for the derivation of the oscillation probability. The time = distance assumption derives from the...
Source: http://arxiv.org/abs/0801.0653v1
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91
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti
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eye 91
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It is shown that neutrino mixing cannot explain the GSI time anomaly, refuting recent claims in this direction. Addendum 1: Remarks on arXiv:0801.1465. Addendum 2: Quantum effects in GSI nuclear decay.
Source: http://arxiv.org/abs/0801.4639v3
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36
Sep 23, 2013
09/13
Sep 23, 2013
by
David Dooling; Carlo Giunti; Kyungsik Kang; Chung W. Kim
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eye 36
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We present a formalism for the description of oscillations in matter of solar, atmospheric and long-baseline neutrinos in the two schemes of four-neutrino mixing that are allowed by the results of all existing neutrino oscillation experiments.
Source: http://arxiv.org/abs/hep-ph/9908513v1
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53
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti
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eye 53
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The indications in favor of short-baseline neutrino oscillations, which require the existence of one or more sterile neutrinos, are reviewed. In the framework of 3+1 neutrino mixing, which is the simplest extension of the standard three-neutrino mixing which can partially explain the data, there is a strong tension in the interpretation of the data, mainly due to an incompatibility of the results of appearance and disappearance experiments. In the framework of 3+2 neutrino mixing, CP violation...
Source: http://arxiv.org/abs/1110.3914v1
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108
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti; Alexander Studenikin
texts
eye 108
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A short review on electromagnetic properties of neutrinos is presented. In spite of many efforts in the theoretical and experimental studies of neutrino electromagnetic properties, they still remain one of the main puzzles related to neutrinos.
Source: http://arxiv.org/abs/1006.1502v1
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65
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti; Marco Laveder
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eye 65
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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
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50
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti; Marco Laveder
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eye 50
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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
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96
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti; Marco Laveder
texts
eye 96
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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
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36
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti; Marco Laveder
texts
eye 36
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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
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60
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti; Marco Laveder
texts
eye 60
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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
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45
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti
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eye 45
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The main aspects of the phenomenology of absolute neutrino masses are reviewed, focusing on the limits on neutrino masses obtained in tritium beta decay experiments, cosmological observations and neutrinoless double-beta decay experiments.
Source: http://arxiv.org/abs/hep-ph/0511131v1
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48
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti; Marco Laveder
texts
eye 48
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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
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82
Sep 23, 2013
09/13
Sep 23, 2013
by
Alessandro Mirizzi; Gianpiero Mangano; Ninetta Saviano; Enrico Borriello; Carlo Giunti; Gennaro Miele; Ofelia Pisanti
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Light sterile neutrinos can be excited by oscillations with active neutrinos in the early universe. Their properties can be constrained by their contribution as extra-radiation, parameterized in terms of the effective number of neutrino species N_ eff, and to the universe energy density today \Omega_\nu h^2. Both these parameters have been measured to quite a good precision by the Planck satellite experiment. We use this result to update the bounds on the parameter space of (3+1) sterile...
Source: http://arxiv.org/abs/1303.5368v2
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46
Sep 23, 2013
09/13
Sep 23, 2013
by
Jostein R. Kristiansen; Øystein Elgarøy; Carlo Giunti; Marco Laveder
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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
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47
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti
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eye 47
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I refute the criticisms of hep-ph/0311241 raised in hep-ph/0312151.
Source: http://arxiv.org/abs/hep-ph/0312180v2
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55
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti
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eye 55
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It is shown that it is possible to construct an infinity of Fock spaces of flavor neutrinos depending on arbitrary unphysical mass parameters, in agreement with the theory of Blasone and Vitiello in the version proposed by Fujii, Habe and Yabuki. However, we show that these flavor neutrino Fock spaces are clever mathematical constructs without physical relevance, because the hypothesis that neutrinos produced or detected in charged-current weak interaction processes are described by flavor...
Source: http://arxiv.org/abs/hep-ph/0312256v2
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53
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti
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eye 53
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It is shown that at least four massive neutrinos are needed in order to accommodate the evidences in favor of neutrino oscillations found in solar and atmospheric neutrino experiments and in the LSND experiment. Among all four-neutrino schemes, only two are compatible with the results of all neutrino oscillation experiments. These two schemes have a mass spectrum composed of two pairs of neutrinos with close masses separated by the "LSND gap" of the order of 1 eV.
Source: http://arxiv.org/abs/hep-ph/9909395v1
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55
Sep 23, 2013
09/13
Sep 23, 2013
by
Carlo Giunti
texts
eye 55
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It is shown that at least four massive neutrinos are needed in order to accommodate the evidences in favor of neutrino oscillations found in solar and atmospheric neutrino experiments and in the LSND experiment. Among all four-neutrino schemes, only two are compatible with the results of all neutrino oscillation experiments. These two schemes have a mass spectrum composed of two pairs of neutrinos with close masses separated by the "LSND gap" of the order of 1 eV.
Source: http://arxiv.org/abs/hep-ph/9909465v1
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70
Sep 22, 2013
09/13
Sep 22, 2013
by
Carlo Giunti
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eye 70
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We present a derivation of the flavor neutrino states which describe neutrinos produced or detected in charged-current weak-interaction processes, including those operating in neutrino oscillation experiments. We also present a covariant derivation of the probability of neutrino oscillations which is consistent with the fact that flavor is Lorentz-invariant. Finally, we clarify the negative answers to three commonly asked questions: "Do charged leptons oscillate?"; "Is the...
Source: http://arxiv.org/abs/hep-ph/0409230v1
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55
Sep 22, 2013
09/13
Sep 22, 2013
by
Carlo Giunti
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eye 55
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The experimental evidences in favor of oscillations of solar (and KamLAND) and atmospheric (and K2K) neutrinos are briefly reviewed and accommodated in the framework of three-neutrino mixing. The implications for the values of neutrino masses are discussed and the bounds on the absolute scale of neutrino masses from Tritium beta-decay and cosmological data are reviewed. Finally, we discuss the implications of three-neutrino mixing for neutrinoless double-beta decay.
Source: http://arxiv.org/abs/hep-ph/0309024v1
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41
Sep 22, 2013
09/13
Sep 22, 2013
by
Carlo Giunti
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eye 41
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It is shown that the Majorana phases of the neutrino mixing matrix cannot have any effect in neutrino oscillations, contrary to the argument presented in arXiv:0912.5266. It is also shown that in a charged-current weak interaction process it is not possible to create a coherent superposition of different flavor neutrinos which is independent of the associated charged leptons.
Source: http://arxiv.org/abs/1001.0760v2
42
42
Sep 22, 2013
09/13
Sep 22, 2013
by
Carlo Giunti
texts
eye 42
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With the help of an analogy with a double-slit experiment, it is shown that the standard method of calculation of the rate of an interaction process by adding the rates of production of all the allowed final states, regardless of a possible coherence among them, is correct. It is a consequence of causality. The claims that the GSI time anomaly is due to the mixing of neutrinos in the final state of the electron-capture process are refuted. It is shown that the GSI time anomaly may be due to...
Source: http://arxiv.org/abs/0805.0431v1
87
87
Sep 22, 2013
09/13
Sep 22, 2013
by
Carlo Giunti; Alexander Studenikin
texts
eye 87
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The main goal of the paper is to give a short review on neutrino electromagnetic properties. In the introductory part of the paper a summary on what we really know about neutrinos is given: we discuss the basics of neutrino mass and mixing as well as the phenomenology of neutrino oscillations. This is important for the following discussion on neutrino electromagnetic properties that starts with a derivation of the neutrino electromagnetic vertex function in the most general form, that follows...
Source: http://arxiv.org/abs/0812.3646v5
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40
Sep 22, 2013
09/13
Sep 22, 2013
by
Carlo Giunti
texts
eye 40
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The claims that the GSI time anomaly is due to the mixing of neutrinos in the final state of the observed electron-capture processes are refuted. With the help of an analogy with a double-slit experiment, it is shown that the standard method of calculation of the rate of an interaction process by adding the rates of production of all the allowed final states, regardless of a possible coherence among them, is correct. It is a consequence of causality. It is shown that the GSI time anomaly may be...
Source: http://arxiv.org/abs/0812.1887v1
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44
Sep 22, 2013
09/13
Sep 22, 2013
by
Roland M. Crocker; Carlo Giunti; and Daniel J. Mortlock
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eye 44
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Gravitational lensing introduces the possibility of multiple (macroscopic) paths from an astrophysical neutrino source to a detector. Such a multiplicity of paths can allow for quantum mechanical interference to take place that is qualitatively different to neutrino oscillations in flat space. After an illustrative example clarifying some under-appreciated subtleties of the phase calculation, we derive the form of the quantum mechanical phase for a neutrino mass eigenstate propagating...
Source: http://arxiv.org/abs/hep-ph/0308168v2
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41
Sep 22, 2013
09/13
Sep 22, 2013
by
Carlo Giunti
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eye 41
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After a short review of the current status of three-neutrino mixing, the implications for the values of neutrino masses are discussed. The bounds on the absolute scale of neutrino masses from Tritium beta-decay and cosmological data are reviewed. Finally, we discuss the implications of three-neutrino mixing for neutrinoless double-beta decay.
Source: http://arxiv.org/abs/hep-ph/0308206v1
61
61
Sep 22, 2013
09/13
Sep 22, 2013
by
Maria Archidiacono; Nicolao Fornengo; Carlo Giunti; Steen Hannestad; Alessandro Melchiorri
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eye 61
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Cosmology and short baseline neutrino oscillation data both hint at the existence of light sterile neutrinos with masses in the 1 eV range. Here we perform a detailed analysis of the sterile neutrino scenario using both cosmological and SBL data. We have additionally considered the possibility that the extra neutrino degrees of freedom are not fully thermalised in the early universe. Even when analyzing only cosmological data we find a preference for the existence of massive sterile neutrinos...
Source: http://arxiv.org/abs/1302.6720v2
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55
Sep 22, 2013
09/13
Sep 22, 2013
by
Carlo Giunti; Marco Laveder
texts
eye 55
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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
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51
Sep 21, 2013
09/13
Sep 21, 2013
by
Carlo Giunti; Marco Laveder
texts
eye 51
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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
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39
Sep 21, 2013
09/13
Sep 21, 2013
by
Carlo Giunti
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eye 39
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After a brief review of the results of solar, atmospheric and long-baseline neutrino oscillation experiments which led to the current three-neutrino mixing paradigm, we discuss indications of neutrino oscillation experiments in favor of short-baseline oscillations which require the existence of one or more sterile neutrinos. We show that the simplest possibility of existence of one sterile neutrino is not enough to fit all data of short-baseline neutrino oscillation experiments because of two...
Source: http://arxiv.org/abs/1106.4479v1
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58
Sep 21, 2013
09/13
Sep 21, 2013
by
Carlo Giunti
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eye 58
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We review critically the main assumptions on which the standard theory of neutrino oscillations is based. We show that all assumptions are realistic, except the so-called "equal momentum assumption", which however is irrelevant. We conclude that the standard expression for the probability of neutrino oscillations is robust.
Source: http://arxiv.org/abs/hep-ph/0311241v2
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42
Sep 21, 2013
09/13
Sep 21, 2013
by
Carlo Giunti
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eye 42
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It is shown that a flavor neutrino state that describes a neutrino produced or detected in a charged-current weak interaction process depends on the process under consideration and is appropriate for the description of neutrino oscillations as well as for the calculation of neutrino production or detection rates. Hence, we have a consistent framework for the description of neutrino oscillations and interactions.
Source: http://arxiv.org/abs/hep-ph/0402217v1
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59
Sep 21, 2013
09/13
Sep 21, 2013
by
Carlo Giunti
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eye 59
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The claims that the GSI time anomaly is due to the mixing of neutrinos in the final state of the observed electron-capture decays of hydrogen-like heavy ions are refuted with the help of an analogy with a double-slit experiment. It is a consequence of causality. It is shown that the GSI time anomaly may be caused by quantum beats due to the existence of two coherent energy levels of the decaying ion with an extremely small energy splitting (about $6\times10^{-16} \text{eV}$) and relative...
Source: http://arxiv.org/abs/0905.4620v1
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39
Sep 21, 2013
09/13
Sep 21, 2013
by
Carlo Giunti; Marco Laveder
texts
eye 39
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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
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50
Sep 20, 2013
09/13
Sep 20, 2013
by
Carlo Giunti
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eye 50
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The definition and derivation of flavor neutrino states in the framework of standard Quantum Field Theory is reviewed, clarifying some subtle points. It is shown that a flavor neutrino state that describes a neutrino produced or detected in a charged-current weak interaction process depends on the process under consideration and is appropriate for the description of neutrino oscillations as well as for the calculation of neutrino production or detection rates. Hence, we have a consistent...
Source: http://arxiv.org/abs/hep-ph/0608070v2
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40
Sep 20, 2013
09/13
Sep 20, 2013
by
Maria Archidiacono; Nicolao Fornengo; Carlo Giunti; Alessandro Melchiorri
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eye 40
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Recent results from short--baseline neutrino oscillation experiments and Cosmic Microwave Background anisotropy measurements suggest the presence of additional sterile neutrinos. In this paper we properly combine these data sets to derive bounds on the sterile neutrino masses in the 3+1 and 3+2 frameworks, finding a potentially good agreement between the two datasets. However, when galaxy clustering is included in the analysis a tension between the oscillation and cosmological data is clearly...
Source: http://arxiv.org/abs/1207.6515v1
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53
Sep 19, 2013
09/13
Sep 19, 2013
by
Carlo Giunti
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eye 53
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We consider the two four-neutrino schemes that are compatible with all neutrino oscillation data. We present the range of the corresponding mixing parameters allowed by the results of neutrino oscillation experiments. We discuss the implications for long-baseline experiments and we suggest the possibility to reveal the presence of CP-violating phases through a comparison of the oscillation probability measured in long-baseline experiments with the corresponding average oscillation probability...
Source: http://arxiv.org/abs/hep-ph/9912211v1
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47
Sep 19, 2013
09/13
Sep 19, 2013
by
Carlo Giunti
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eye 47
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We consider the scheme with mixing of three neutrinos and a mass hierarchy. We shown that, under the natural assumptions that massive neutrinos are Majorana particles and there are no unlikely fine-tuned cancellations among the contributions of the different neutrino masses, the results of solar neutrino experiments imply a lower bound for the effective Majorana mass in neutrinoless double-beta decay. We also discuss briefly neutrinoless double-beta decay in schemes with mixing of four...
Source: http://arxiv.org/abs/hep-ph/9912427v1
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40
Sep 19, 2013
09/13
Sep 19, 2013
by
Carlo Giunti; Marco Laveder
texts
eye 40
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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
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45
Sep 19, 2013
09/13
Sep 19, 2013
by
Carlo Giunti
texts
eye 45
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General arguments in favor of the necessity of a wave packet description of neutrino oscillations are presented, drawing from analogies with other wave phenomena. We present a wave packet description of neutrino oscillations in stationary beams using the density matrix formalism. Recent claims of the necessity of an equal energy of different massive neutrinos are refuted.
Source: http://arxiv.org/abs/hep-ph/0302026v3
