scholarly journals Probing nonunitary neutrino mixing via long-baseline neutrino oscillation experiments based at J-PARC

2022 ◽  
Vol 105 (1) ◽  
Author(s):  
Soumya C.
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Mixing ◽  
Long Baseline

VERY LONG BASELINE NEUTRINO OSCILLATION EXPERIMENTS FOR PRECISE MEASUREMENTS OF OSCILLATION PARAMETERS AND SEARCH FOR CP VIOLATION

2003 ◽  
Vol 18 (22) ◽  
pp. 4039-4052 ◽  
Author(s):  
MILIND V. DIWAN
Keyword(s):  
Neutrino Oscillation ◽  
Wide Band ◽  
Neutrino Mixing ◽  
Neutrino Sector ◽  
Long Baseline ◽  
Neutrino Oscillation Experiment ◽  
A Value ◽  
Mixing Parameter ◽  
Mixing Matrix ◽  
Matter Effect

We analyze the prospects of a feasible, very long baseline neutrino oscillation experiment consisting of a conventional horn produced low energy wide band beam and a detector of 500 kT fiducial mass with modest requirements on event recognition and resolution. Such an experiment is intended primarily to measure CP invariance parameters in the neutrino sector. We analyze the sensitivity of such an experiment. The conclusion is that it will allow determination of the CP parameter δCP, if the currently unknown mixing parameter sin 22θ13 ≥ 0.01, a value about 10 times lower than the present experimental upper limit. Such an experiment has great potential for precise measurements of all parameters in the neutrino mixing matrix including [Formula: see text], sin 22θ23, [Formula: see text], and the mass ordering of neutrinos through the observation of the matter effect in the νμ → νe appearance channel.

scholarly journals Exploring fake solutions in the sterile neutrino sector at long-baseline experiments

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
Sandhya Choubey ◽  
Debajyoti Dutta ◽  
Dipyaman Pramanik
Keyword(s):  
Neutrino Oscillation ◽  
Sterile Neutrino ◽  
Neutrino Mixing ◽  
Neutrino Sector ◽  
Long Baseline ◽  
Fast Oscillations ◽  
Long Baselines

AbstractActive-sterile neutrino mixing is known to affect the neutrino oscillation probabilities at both short as well as long-baselines. In particular, constraints on active-sterile neutrino oscillation parameters can be obtained from long-baseline experiments such as T2HK and DUNE. We present here existence of fake solution in the appearance channel for the 3 + 1 scenario at long-baseline experiments. We show that the appearance probability is same for values of $$\Delta m_{41}^2$$Δm412 for which the fast oscillations are averaged out and for $$\Delta m_{41}^2=(1/2)\Delta m_{31}^2$$Δm412=(1/2)Δm312. The fake solution does not appear for the disappearance channel.

scholarly journals Global oscillation data analysis on the 3ν mixing without unitarity

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Zhuojun Hu ◽  
Jiajie Ling ◽  
Jian Tang ◽  
TseChun Wang
Keyword(s):  
Neutrino Oscillation ◽  
Current Data ◽  
Precision Measurements ◽  
Matrix Elements ◽  
Neutrino Mixing ◽  
Unitarity Triangle ◽  
Global Oscillation ◽  
Long Baseline ◽  
Mixing Matrix ◽  
The One

Abstract We present results of a combined analysis in neutrino oscillations without unitarity assumption in the 3ν mixing picture. Constraints on neutrino mixing matrix elements are based on recent data from the reactor, solar and long-baseline accelerator neutrino oscillation experiments. The current data are consistent with the standard 3ν scheme. The precision on different matrix elements can be as good as a few percent at 3σ CL, and is mainly limited by the experimental statistical uncertainty. The νe related elements are the most precisely measured among all sectors with the uncertainties < 20%. The measured leptonic CP violation is very close to the one assuming the standard 3ν mixing. The deviations on normalization and the unitarity triangle closure are confined within $$ \mathcal{O} $$ O (10−3), $$ \mathcal{O} $$ O (10−2) and $$ \mathcal{O} $$ O (10−1), for νe, νμ and ντ sectors, respectively. We look forward to the next-generation neutrino oscillation experiments such as DUNE, T2HK, and JUNO, especially the precision measurements on ντ oscillations, to significantly improve the precision of unitarity test on the 3ν mixing matrix.

scholarly journals UNVEILING NEUTRINO MIXING AND LEPTONIC CP VIOLATION

2005 ◽  
Vol 20 (01) ◽  
pp. 1-17 ◽  
Author(s):  
OLGA MENA
Keyword(s):  
Cp Violation ◽  
Neutrino Oscillation ◽  
Neutrino Masses ◽  
Neutrino Mixing ◽  
Mixing Angle ◽  
Long Baseline ◽  
Neutrino Experiments ◽  
Two Parameters ◽  
Present Understanding ◽  
Neutrino Masses And Mixings

We review the present understanding of neutrino masses and mixings, discussing what are the unknowns in the three-family oscillation scenario. Despite the anticipated success coming from the planned long baseline neutrino experiments in unraveling the leptonic mixing sector, there are two important unknowns which may remain obscure: the mixing angle θ13 and the CP-phase δ. The measurement of these two parameters has led us to consider the combination of superbeams and neutrino factories as the key to unveil the neutrino oscillation picture.

scholarly journals 2020 global reassessment of the neutrino oscillation picture

2021 ◽  
Vol 2021 (2) ◽  
Author(s):  
P. F. de Salas ◽  
D. V. Forero ◽  
S. Gariazzo ◽  
P. Martínez-Miravé ◽  
O. Mena ◽  
...  
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Global Analysis ◽  
Statistical Significance ◽  
Double Beta Decay ◽  
Neutrino Mixing ◽  
Data Set ◽  
Long Baseline ◽  
Global Fit ◽  
The One

Abstract We present an updated global fit of neutrino oscillation data in the simplest three-neutrino framework. In the present study we include up-to-date analyses from a number of experiments. Concerning the atmospheric and solar sectors, besides the data considered previously, we give updated analyses of IceCube DeepCore and Sudbury Neutrino Observatory data, respectively. We have also included the latest electron antineutrino data collected by the Daya Bay and RENO reactor experiments, and the long-baseline T2K and NOνA measurements, as reported in the Neutrino 2020 conference. All in all, these new analyses result in more accurate measurements of θ13, θ12, $$ \Delta {m}_{21}^2 $$ Δ m 21 2 and $$ \left|\Delta {m}_{31}^2\right| $$ Δ m 31 2 . The best fit value for the atmospheric angle θ23 lies in the second octant, but first octant solutions remain allowed at ∼ 2.4σ. Regarding CP violation measurements, the preferred value of δ we obtain is 1.08π (1.58π) for normal (inverted) neutrino mass ordering. The global analysis still prefers normal neutrino mass ordering with 2.5σ statistical significance. This preference is milder than the one found in previous global analyses. These new results should be regarded as robust due to the agreement found between our Bayesian and frequentist approaches. Taking into account only oscillation data, there is a weak/moderate preference for the normal neutrino mass ordering of 2.00σ. While adding neutrinoless double beta decay from the latest Gerda, CUORE and KamLAND-Zen results barely modifies this picture, cosmological measurements raise the preference to 2.68σ within a conservative approach. A more aggressive data set combination of cosmological observations leads to a similar preference for normal with respect to inverted mass ordering, namely 2.70σ. This very same cosmological data set provides 2σ upper limits on the total neutrino mass corresponding to Σmν< 0.12 (0.15) eV in the normal (inverted) neutrino mass ordering scenario. The bounds on the neutrino mixing parameters and masses presented in this up-to-date global fit analysis include all currently available neutrino physics inputs.

scholarly journals COMPARISONS AND COMBINATIONS OF REACTOR AND LONG-BASELINE NEUTRINO OSCILLATION MEASUREMENTS

2006 ◽  
Vol 21 (18) ◽  
pp. 3825-3843 ◽  
Author(s):  
K. B. M. MAHN ◽  
M. H. SHAEVITZ
Keyword(s):  
Cp Violation ◽  
Neutrino Oscillation ◽  
Parameter Space ◽  
Experimental Measurement ◽  
Measurement Errors ◽  
Mass Hierarchy ◽  
Neutrino Mixing ◽  
Precise Information ◽  
Long Baseline ◽  
Active Neutrino

We investigate how the data from various future neutrino oscillation experiments will constrain the physics parameters for a three active neutrino mixing model. The investigations properly account for the degeneracies and ambiguities associated with the phenomenology as well as estimates of experimental measurement errors. Combinations of various reactor measurements with the expected J-PARC (T2K) and NuMI offaxis (Nova) data, both with and without the increased flux associated with proton driver upgrades, are considered. The studies show how combinations of reactor and offaxis data can resolve degeneracies (e.g. the θ23 degeneracy) and give more precise information on the oscillation parameters. A primary purpose of this investigation is to establish the parameter space regions where CP violation can be discovered and where the mass hierarchy can be determined. We find that, even with augmented flux from proton drivers, such measurements demand that sin 2 2θ13 be fairly large and in the range where it is measurable by reactor experiments.

scholarly journals Physics Potential of Long-Baseline Experiments

2014 ◽  
Vol 2014 ◽  
pp. 1-29 ◽  
Author(s):  
Sanjib Kumar Agarwalla
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
New Physics ◽  
Mass Hierarchy ◽  
Neutrino Mixing ◽  
Neutrino Mass Hierarchy ◽  
Mixing Angle ◽  
Long Baseline ◽  
Physics Potential ◽  
Flavor Oscillation

The discovery of neutrino mixing and oscillations over the past decade provides firm evidence for new physics beyond the Standard Model. Recently,θ13has been determined to be moderately large, quite close to its previous upper bound. This represents a significant milestone in establishing the three-flavor oscillation picture of neutrinos. It has opened up exciting prospects for current and future long-baseline neutrino oscillation experiments towards addressing the remaining fundamental questions, in particular the type of the neutrino mass hierarchy and the possible presence of a CP-violating phase. Another recent and crucial development is the indication of non-maximal 2-3 mixing angle, causing the octant ambiguity ofθ23. In this paper, I will review the phenomenology of long-baseline neutrino oscillations with a special emphasis on sub-leading three-flavor effects, which will play a crucial role in resolving these unknowns. First, I will give a brief description of neutrino oscillation phenomenon. Then, I will discuss our present global understanding of the neutrino mass-mixing parameters and will identify the major unknowns in this sector. After that, I will present the physics reach of current generation long-baseline experiments. Finally, I will conclude with a discussion on the physics capabilities of accelerator-driven possible future long-baseline precision oscillation facilities.

NEUTRINO MASSES, OSCILLATIONS, AND TESTS WITH FUTURE SUPERBEAMS AND A NEUTRINO FACTORY

2003 ◽  
Vol 18 (22) ◽  
pp. 3921-3933 ◽  
Author(s):  
M. LINDNER
Keyword(s):  
Cp Violation ◽  
Neutrino Oscillation ◽  
Neutrino Masses ◽  
Neutrino Factory ◽  
Mixing Angles ◽  
Long Baseline

Future long baseline neutrino oscillation (LBL) setups are discussed and the remarkable potential for very precise measurements of mass splittings, mixing angles, MSW effects, the sign of Δm2 and leptonic CP violation is shown. Furthermore we discuss the sensitivity improvements which can be obatined by combining the planned JHF-Superkamiokande and the proposed NuMI off-axis experiment.

Sign in / Sign up

Export Citation Format

Share Document