scholarly journals Tensions between the appearance data of T2K and NOνA

2019 ◽  
Vol 35 (06) ◽  
pp. 2050021
Author(s):  
Mohammad Nizam ◽  
Suman Bharti ◽  
Suprabh Prakash ◽  
Ushak Rahaman ◽  
S. Uma Sankar
Keyword(s):  
Confidence Level ◽  
Data Sets ◽  
Long Baseline ◽  
Neutrino Experiments ◽  
Best Fit

The long baseline neutrino experiments, T2K and NO[Formula: see text]A, have taken significant amount of data in each of the four channels: (a) [Formula: see text] disappearance, (b) [Formula: see text] disappearance, (c) [Formula: see text] appearance, and (d) [Formula: see text] appearance. There is a mild tension between the disappearance and the appearance data sets of T2K. A more serious tension exists between the [Formula: see text] appearance data of T2K and the [Formula: see text] appearance data of NO[Formula: see text]A. This tension is significant enough that T2K rules out the best-fit point of NO[Formula: see text]A at 95% confidence level, whereas, NO[Formula: see text]A rules out T2K best-fit point at 90% confidence level. We explain the reason why these tensions arise. We also do a combined fit of T2K and NO[Formula: see text]A data and comment on the results of this fit.

scholarly journals Testing NSI suggested by solar neutrino tension in T2HKK and DUNE

2020 ◽  
Vol 35 (17) ◽  
pp. 2050142
Author(s):  
Monojit Ghosh ◽  
Osamu Yasuda
Keyword(s):  
Parameter Space ◽  
Solar Neutrino ◽  
Global Analysis ◽  
Solar Neutrinos ◽  
Long Baseline ◽  
The Future ◽  
Neutrino Experiments ◽  
Best Fit ◽  
Dependent Interaction ◽  
Neutrino Propagation

It was shown that the tension between the mass-squared differences obtained from solar neutrinos and those acquired through KamLAND experiments may be solved by the introduction of a non-standard flavor-dependent interaction (NSI) in neutrino propagation. In this study, we discuss the possibility of testing such a hypothesis using the future long-baseline neutrino experiments T2HKK and DUNE. Assuming that the NSI does not exist, we provide the excluded region within the ([Formula: see text], [Formula: see text]) plane, where [Formula: see text] and [Formula: see text] are the parameters appearing in the solar neutrino analysis conducted with the NSI. We find that the best fit value from the solar neutrino and KamLAND data (global analysis of a particular coupling to quarks) can be tested at more than [Formula: see text] by these two experiments for most of the parameter space.

scholarly journals Octant Degeneracy and Quadrant of Leptonic CPV Phase at Long BaselineνExperiments and Baryogenesis

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Kalpana Bora ◽  
Gayatri Ghosh ◽  
Debajyoti Dutta
Keyword(s):  
Numerical Study ◽  
Global Analysis ◽  
Neutrino Mixing ◽  
Inverted Hierarchy ◽  
Mixing Angle ◽  
Mixing Angles ◽  
Long Baseline ◽  
Discovery Potential ◽  
Neutrino Experiments ◽  
Best Fit

In a recent work by us, we have studied how CP violation discovery potential can be improved at long baseline neutrino experiments (LBNE/DUNE), by combining with its ND (near detector) and reactor experiments. In this work, we discuss how this study can be further analysed to resolve entanglement of the quadrant of leptonic CPV phase and octant of atmospheric mixing angleθ23, at LBNEs. The study is done for both NH (normal hierarchy) and IH (inverted hierarchy), HO (higher octant), and LO (lower octant). We show how baryogenesis can enhance the effect of resolving this entanglement and how possible values of the leptonic CP violating phaseδCPcan be predicted in this context. With respect to the latest global fit data of neutrino mixing angles, we predict the values ofδCPfor different cases. In this context we present favoured values ofδCP(δCPrange at ≥2σ) constrained by the latest updated BAU range and also confront our predictions ofδCPwith an up-to-date global analysis of neutrino oscillation data. We find that some region of the favouredδCPparameter space lies within the best fit values aroundδCP≃1.3π–1.4π. A detailed analytic and numerical study of baryogenesis through leptogenesis is performed in this framework within the nonsupersymmetric SO(10)models.

scholarly journals Looking for Lorentz invariance violation (LIV) in the latest long baseline accelerator neutrino oscillation data

2021 ◽  
Vol 81 (9) ◽  
Author(s):  
Ushak Rahaman
Keyword(s):  
Data Analysis ◽  
Neutrino Oscillation ◽  
Confidence Level ◽  
Lorentz Invariance ◽  
Long Baseline ◽  
Invariance Violation ◽  
Lorentz Invariance Violation ◽  
Best Fit ◽  
Combined Data

AbstractIn this paper, we have analysed the latest data from NO$$\nu $$ ν A and T2K with the Lorentz invariance violation along with the standard oscillation hypothesis. We have found that the NO$$\nu $$ ν A data cannot distinguish between the two hypotheses at $$1\, \sigma $$ 1 σ confidence level. T2K data and the combined data analysis excludes standard oscillation at $$1\, \sigma $$ 1 σ . All three cases do not have any hierarchy sensitivity when analysed with LIV. There is a mild tension between the two experiments, when analysed with LIV, as $${\theta _{23}}$$ θ 23 at NO$$\nu $$ ν A best-fit is at higher octant but the same for T2K is at lower octant. The present data from accelerator neutrino long baseline experiments lose octant determination sensitivity when analysed with LIV. The tension between the two experiments is also reduced when the data are analysed with LIV.

scholarly journals DETERMINING THE SIGN OF Δ31 AT LONG BASELINE NEUTRINO EXPERIMENTS

2001 ◽  
Vol 16 (29) ◽  
pp. 1881-1886
Author(s):  
MOHAN NARAYAN ◽  
S. UMA SANKAR
Keyword(s):  
High Intensity ◽  
Low Energy ◽  
Earth’S Crust ◽  
Mixing Angle ◽  
Background Ratio ◽  
Matter Effects ◽  
Long Baseline ◽  
Earth's Crust ◽  
Neutrino Experiments

Recently it is advocated that high intensity and low energy (Eν~2 GeV ) neutrino beams should be built to probe the (13) mixing angle ϕ to a level of a few parts in 104. Experiments using such beams will have better signal-to-background ratio in searches for νμ→νe oscillations. We propose that such experiments can also determine the sign of Δ31 even if the beam consists of neutrinos only. By measuring the νμ→νe transitions in two different energy ranges, the effects due to propagation of neutrinos through earth's crust can be isolated and the sign of Δ31 can be determined. If the sensitivity of an experiment to ϕ is ε, then the same experiment is automatically sensitive to matter effects and the sign of Δ31 for values of ϕ≥2ε.

scholarly journals Consistency of nonlinear interacting ghost dark energy with recent observations

2017 ◽  
Vol 26 (11) ◽  
pp. 1750124 ◽  
Author(s):  
E. Ebrahimi ◽  
H. Golchin ◽  
A. Mehrabi ◽  
S. M. S. Movahed
Keyword(s):  
Dark Energy ◽  
Observational Data ◽  
Nonlinear Interaction ◽  
Acoustic Oscillation ◽  
Joint Analysis ◽  
Data Sets ◽  
Dark Energy Density ◽  
Ghost Dark Energy ◽  
Interaction Terms ◽  
Best Fit

In this paper, we investigate ghost dark energy model in the presence of nonlinear interaction between dark energy and dark matter. We also extend the analysis to the so-called generalized ghost dark energy (GGDE) which [Formula: see text]. The model contains three free parameters as [Formula: see text] and [Formula: see text] (the coupling coefficient of interactions). We propose three kinds of nonlinear interaction terms and discuss the behavior of equation of state, deceleration and dark energy density parameters of the model. We also find the squared sound speed and search for signs of stability of the model. To compare the interacting GGDE model with observational data sets, we use more recent observational outcomes, namely SNIa from JLA catalog, Hubble parameter, baryonic acoustic oscillation and the most relevant CMB parameters including, the position of acoustic peaks, shift parameters and redshift to recombination. For GGDE with the first nonlinear interaction, the joint analysis indicates that [Formula: see text], [Formula: see text] and [Formula: see text] at 1 optimal variance error. For the second interaction, the best fit values at [Formula: see text] confidence are [Formula: see text], [Formula: see text] and [Formula: see text]. According to combination of all observational data sets considered in this paper, the best fit values for third nonlinearly interacting model are [Formula: see text], [Formula: see text] and [Formula: see text] at [Formula: see text] confidence interval. Finally, we found that the presence of interaction is compatible in mentioned models via current observational datasets.

scholarly journals Linking Solar and Long Baseline Terrestrial Neutrino Experiments

2000 ◽  
Vol 84 (16) ◽  
pp. 3535-3538 ◽  
Author(s):  
E. Kh. Akhmedov ◽  
G. C. Branco ◽  
M. N. Rebelo
Keyword(s):  
Long Baseline ◽  
Neutrino Experiments

scholarly journals Design of Link Evaluation Method to Improve Reliability based on Linked Open Big Data and Natural Language Processing

2018 ◽  
Vol 7 (3.33) ◽  
pp. 168
Author(s):  
Yonglak SHON ◽  
Jaeyoung PARK ◽  
Jangmook KANG ◽  
Sangwon LEE
Keyword(s):  
Big Data ◽  
Natural Language Processing ◽  
Language Processing ◽  
Confidence Level ◽  
Linked Data ◽  
Evaluation Method ◽  
Data Sets ◽  
Knowledge Based ◽  
Global Data ◽  
Improve Reliability

The LOD data sets consist of RDF Triples based on the Ontology, a specification of existing facts, and by linking them to previously disclosed knowledge based on linked data principles. These structured LOD clouds form a large global data network, which provides a more accurate foundation for users to deliver the desired information. However, it is difficult to identify that, if the presence of the same object is identified differently across several LOD data sets, they are inherently identical. This is because objects with different URIs in the LOD datasets must be different and they must be closely examined for similarities in order to judge them as identical. The aim of this study is that the prosed model, RILE, evaluates similarity by comparing object values of existing specified predicates. After performing experiments with our model, we could check the improvement of the confidence level of the connection by extracting the link value.  

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