scholarly journals Significant Excess of Electronlike Events in the MiniBooNE Short-Baseline Neutrino Experiment

2018 ◽  
Vol 121 (22) ◽  
Author(s):  
A. A. Aguilar-Arevalo ◽  
B. C. Brown ◽  
L. Bugel ◽  
G. Cheng ◽  
J. M. Conrad ◽  
...  
Keyword(s):  
Neutrino Experiment ◽  
Significant Excess ◽  
Short Baseline

scholarly journals Reactor neutrino experiments: θ13 and beyond

2014 ◽  
Vol 29 (16) ◽  
pp. 1430016 ◽  
Author(s):  
Xin Qian ◽  
Wei Wang
Keyword(s):  
New Physics ◽  
Daya Bay ◽  
Neutrino Experiment ◽  
Mass Hierarchy ◽  
Neutrino Mixing ◽  
Next Generation ◽  
Short Baseline ◽  
Current Generation ◽  
Reactor Neutrino ◽  
Neutrino Experiments

We review the current-generation short-baseline reactor neutrino experiments that have firmly established the third neutrino mixing angle θ13 to be nonzero. The relative large value of θ13 (around 9°) has opened many new and exciting opportunities for future neutrino experiments. Daya Bay experiment with the first measurement of [Formula: see text] is aiming for a precision measurement of this atmospheric mass-squared splitting with a comparable precision as [Formula: see text] from accelerator muon neutrino experiments. JUNO, a next-generation reactor neutrino experiment, is targeting to determine the neutrino mass hierarchy (MH) with medium baselines (~ 50 km). Beside these opportunities enabled by the large θ13, the current-generation (Daya Bay, Double Chooz, and RENO) and the next-generation (JUNO, RENO-50, and PROSPECT) reactor experiments, with their unprecedented statistics, are also leading the precision era of the three-flavor neutrino oscillation physics as well as constraining new physics beyond the neutrino Standard Model.

scholarly journals Exploring the new physics phases in 3+1 scenario in neutrino oscillation experiments

2021 ◽  
Vol 2021 (9) ◽  
Author(s):  
Nishat Fiza ◽  
Mehedi Masud ◽  
Manimala Mitra
Keyword(s):  
Neutrino Oscillation ◽  
Sterile Neutrino ◽  
New Physics ◽  
Double Beta Decay ◽  
Relevant Parameter ◽  
Neutrino Experiment ◽  
Short Baseline ◽  
Mixing Angles ◽  
Long Baseline ◽  
Deep Underground

Abstract The various global analyses of available neutrino oscillation data indicate the presence of the standard 3 + 0 neutrino oscillation picture. However, there are a few short baseline anomalies that point to the possible existence of a fourth neutrino (with mass in the eV-scale), essentially sterile in nature. Should sterile neutrino exist in nature and its presence is not taken into consideration properly in the analyses of neutrino data, the interference terms arising due to the additional CP phases in presence of a sterile neutrino can severely impact the physics searches in long baseline (LBL) neutrino oscillation experiments. In the current work we consider one light (eV-scale) sterile neutrino and probe all the three CP phases (δ13, δ24, δ34) in the context of the upcoming Deep Underground Neutrino Experiment (DUNE) and also estimate how the results improve when data from NOvA, T2K and T2HK are added in the analysis. We illustrate the ∆χ2 correlations of the CP phases among each other, and also with the three active-sterile mixing angles. Finally, we briefly illustrate how the relevant parameter spaces in the context of neutrinoless double beta decay get modified in light of the bounds in presence of a light sterile neutrino.

scholarly journals Sterile Neutrinos with Neutrino Telescopes

Universe ◽  
2021 ◽  
Vol 7 (11) ◽  
pp. 426
Author(s):  
Carlos A. Argüelles ◽  
Jordi Salvado
Keyword(s):  
Liquid Scintillator ◽  
Atmospheric Neutrino ◽  
Neutrino Flux ◽  
Electron Neutrino ◽  
Anthropogenic Sources ◽  
Current Status ◽  
Neutrino Experiment ◽  
Sterile Neutrinos ◽  
Short Baseline ◽  
Neutrino Telescopes

Searches for light sterile neutrinos are motivated by the unexpected observation of an electron neutrino appearance in short-baseline experiments, such as the Liquid Scintillator Neutrino Detector (LSND) and the Mini Booster Neutrino Experiment (MiniBooNE). In light of these unexpected results, a campaign using natural and anthropogenic sources to find the light (mass-squared-difference around 1 eV2) sterile neutrinos is underway. Among the natural sources, atmospheric neutrinos provide a unique gateway to search for sterile neutrinos due to the broad range of baseline-to-energy ratios, L/E, and the presence of significant matter effects. Since the atmospheric neutrino flux rapidly falls with energy, studying its highest energy component requires gigaton-scale neutrino detectors. These detectors—often known as neutrino telescopes since they are designed to observe tiny astrophysical neutrino fluxes—have been used to perform searches for light sterile neutrinos, and researchers have found no significant signal to date. This brief review summarizes the current status of searches for light sterile neutrinos with neutrino telescopes deployed in solid and liquid water.

scholarly journals The Short-Baseline Neutrino Program at Fermilab

2019 ◽  
Vol 69 (1) ◽  
pp. 363-387 ◽  
Author(s):  
Pedro A.N. Machado ◽  
Ornella Palamara ◽  
David W. Schmitz
Keyword(s):  
Liquid Argon ◽  
New Physics ◽  
Energy Scale ◽  
Neutrino Beam ◽  
Neutrino Experiment ◽  
Sterile Neutrinos ◽  
Short Baseline ◽  
Long Baseline ◽  
Fermi National Accelerator Laboratory ◽  
Time Projection

The Short-Baseline Neutrino (SBN) program consists of three liquid argon time-projection chamber detectors located along the Booster Neutrino Beam at Fermi National Accelerator Laboratory. Its main goals include searches for New Physics—particularly eV-scale sterile neutrinos, detailed studies of neutrino–nucleus interactions at the GeV energy scale, and the advancement of the liquid argon detector technology that will also be used in the DUNE/LBNF long-baseline neutrino experiment in the next decade. We review these science goals and the current experimental status of SBN.

scholarly journals Evidence and Search for Sterile Neutrinos at Accelerators

2013 ◽  
Vol 2013 ◽  
pp. 1-14
Author(s):  
W. C. Louis
Keyword(s):  
Particle Physics ◽  
Nuclear Physics ◽  
Neutrino Oscillations ◽  
Neutrino Energy ◽  
Mass Scale ◽  
Neutrino Experiment ◽  
Sterile Neutrinos ◽  
Short Baseline ◽  
Published Evidence ◽  
Under Construction

The LSND short-baseline neutrino experiment has published evidence for antineutrino oscillations at a mass scale of ~1 eV2. The MiniBooNE experiment, designed to test this evidence for oscillations at an order of magnitude higher neutrino energy and distance, observes excesses of events in both neutrino mode and antineutrino mode. While the MiniBooNE neutrino excess has a neutrino energy spectrum that is softer than expected from LSND, the MiniBooNE antineutrino excess is consistent with neutrino oscillations and with the LSND oscillation signal. When combined with oscillation measurements at the solar and atmospheric mass scales, assuming that the LSND and MiniBooNE signals are due to neutrino oscillations, these experiments imply the existence of more than three neutrino mass states and, therefore, one or more sterile neutrinos. Such sterile neutrinos, if proven to exist, would have a big impact on particle physics, nuclear physics, and astrophysics and would contribute to the dark matter of the universe. Future experiments under construction or proposed at Fermilab, ORNL, CERN, and in Japan will provide a definitive test of short-baseline neutrino oscillations and will have the capability of proving the existence of sterile neutrinos.

scholarly journals Constraining the Effective Mass of Majorana Neutrino with Sterile Neutrino Mass for Inverted Ordering Spectrum

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Jaydip Singh
Keyword(s):  
Effective Mass ◽  
Majorana Neutrino ◽  
Current Data ◽  
Neutrino Experiment ◽  
Beyond The Standard Model ◽  
Short Baseline ◽  
Normal Ordering ◽  
Lepton Number Violation ◽  
The Standard Model ◽  
Near Future

Inspired by the experimental anomalies in neutrino physics and recent oscillation data from short baseline and another neutrino experiment, the realization of one extra neutrino flavor seems to be favoring. This extra flavor may change the observable, |mββ|, of current data taking and next-generation (ββ)0ν-decay experiments aim to probe and possibly look at the Inverted Ordering region (|mββ|≃10-2eV) of parameter space. This observation would allow establishing physics beyond the standard model and phenomena like lepton number violation and Majorana nature of neutrino. The range of this observable (|mββ|) is not very well defined for both the ordering of mass spectrum (Normal Ordering and Inverted Ordering). Several attempts have been made for defining exactly the range for three active neutrino states. For contrasting this range, I have worked with an extra mass state, ν4, and its effect on the observable with various combinations of CP violation Majorana phases by taking into account the updated data on the neutrino oscillation parameters for IO case. Based on the Monte Carlo technique, a parameter region is obtained using the fourth Majorana-Dirac phase of sterile parameters that lead to an effective mass below 0.01 eV or .05 eV for inverted mass ordering case which is planned to be observed in the near future experiment.

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