scholarly journals A FORMULA FOR THE SENSITIVITY TO sin2 2θ13 IN REACTOR EXPERIMENTS WITH A SPECTRAL ANALYSIS

2007 ◽  
Vol 22 (20) ◽  
pp. 3407-3428 ◽  
Author(s):  
H. SUGIYAMA ◽  
O. YASUDA
Keyword(s):  
Spectral Analysis ◽  
Systematic Error ◽  
Neutrino Oscillation ◽  
Spectrum Analysis ◽  
Analytical Approach ◽  
Neutrino Oscillations ◽  
Square Root ◽  
Rate Analysis ◽  
Reactor Neutrino ◽  
Two Parameters

Using an analytical approach, the sensitivity to sin 2 2θ13 with infinite statistics in a spectral analysis is investigated in reactor neutrino oscillation experiments with one reactor and two identical detectors. We derive an useful formula for the sensitivity which depends only on two parameters [Formula: see text] (the uncorrelated bin-to-bin systematic error over the square-root of the number of bins) and σ dB (the bin-to-bin correlated detector specific systematic error) if they are smaller than other errors. It is pointed out that the spectrum analysis is advantageous over the rate analysis in search of neutrino oscillations for [Formula: see text].

scholarly journals Neutrino Oscillation Analysis of 217 Live Days of Daya Bay and 500 Live Days of RENO

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Mario A. Acero ◽  
Alexis A. Aguilar-Arevalo ◽  
Dairo J. Polo-Toledo
Keyword(s):  
Spectral Analysis ◽  
Effective Mass ◽  
Neutrino Oscillation ◽  
Mass Splitting ◽  
Daya Bay ◽  
Data Sets ◽  
Oscillation Analysis ◽  
Reactor Neutrino ◽  
Neutrino Experiments ◽  
The Individual

We present a neutrino oscillation analysis of two particular data sets from the Daya Bay and RENO reactor neutrino experiments aiming to study the increase in precision in the oscillation parameters sin22θ13 and the effective mass splitting Δmee2 gained by combining two relatively simple to reproduce analyses available in the literature. For Daya Bay, the data from 217 days between December 2011 and July 2012 were used. For RENO, we used the data from 500 live days between August 2011 and January 2012. We reproduce reasonably well the results of the individual analyses, both rate-only and spectral, defining a suitable χ2 statistic for each case. Finally, we performed a combined spectral analysis and extract tighter constraints on the parameters, with an improved precision between 30 and 40% with respect to the individual analyses considered.

scholarly journals Constraint on neutrino decay with medium-baseline reactor neutrino oscillation experiments

2015 ◽  
Vol 2015 (11) ◽  
Author(s):  
Thamys Abrahão ◽  
Hisakazu Minakata ◽  
Hiroshi Nunokawa ◽  
Alexander A. Quiroga
Keyword(s):  
Neutrino Oscillation ◽  
Reactor Neutrino ◽  
Neutrino Decay

scholarly journals Non-standard interactions in SMEFT confronted with terrestrial neutrino experiments

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Yong Du ◽  
Hao-Lin Li ◽  
Jian Tang ◽  
Sampsa Vihonen ◽  
Jiang-Hao Yu
Keyword(s):  
Neutrino Oscillation ◽  
New Physics ◽  
Effective Field ◽  
Scalar Leptoquark ◽  
Double Chooz ◽  
The Standard Model ◽  
Reactor Neutrino ◽  
Model Independent ◽  
Neutrino Experiments ◽  
Individual Dimension

Abstract The Standard Model Effective Field Theory (SMEFT) provides a systematic and model-independent framework to study neutrino non-standard interactions (NSIs). We study the constraining power of the on-going neutrino oscillation experiments T2K, NOνA, Daya Bay, Double Chooz and RENO in the SMEFT framework. A full consideration of matching is provided between different effective field theories and the renormalization group running at different scales, filling the gap between the low-energy neutrino oscillation experiments and SMEFT at the UV scale. We first illustrate our method with a top- down approach in a simplified scalar leptoquark model, showing more stringent constraints from the neutrino oscillation experiments compared to collider studies. We then provide a bottom-up study on individual dimension-6 SMEFT operators and find NSIs in neutrino experiments already sensitive to new physics at ∼20 TeV when the Wilson coefficients are fixed at unity. We also investigate the correlation among multiple operators at the UV scale and find it could change the constraints on SMEFT operators by several orders of magnitude compared with when only one operator is considered. Furthermore, we find that accelerator and reactor neutrino experiments are sensitive to different SMEFT operators, which highlights the complementarity of the two experiment types.

scholarly journals Statistical interpretation of sterile neutrino oscillation searches at reactors

2021 ◽  
Vol 81 (1) ◽  
Author(s):  
Pilar Coloma ◽  
Patrick Huber ◽  
Thomas Schwetz
Keyword(s):  
Neutrino Oscillation ◽  
Sterile Neutrino ◽  
Statistical Significance ◽  
Statistical Interpretation ◽  
Actual Distribution ◽  
Mixing Angle ◽  
Log Likelihood ◽  
Reactor Neutrino ◽  
Neutrino Experiments ◽  
Experimental Effort

AbstractA considerable experimental effort is currently under way to test the persistent hints for oscillations due to an eV-scale sterile neutrino in the data of various reactor neutrino experiments. The assessment of the statistical significance of these hints is usually based on Wilks’ theorem, whereby the assumption is made that the log-likelihood is $$\chi ^2$$ χ 2 -distributed. However, it is well known that the preconditions for the validity of Wilks’ theorem are not fulfilled for neutrino oscillation experiments. In this work we derive a simple asymptotic form of the actual distribution of the log-likelihood based on reinterpreting the problem as fitting white Gaussian noise. From this formalism we show that, even in the absence of a sterile neutrino, the expectation value for the maximum likelihood estimate of the mixing angle remains non-zero with attendant large values of the log-likelihood. Our analytical results are then confirmed by numerical simulations of a toy reactor experiment. Finally, we apply this framework to the data of the Neutrino-4 experiment and show that the null hypothesis of no-oscillation is rejected at the 2.6 $$\sigma $$ σ level, compared to 3.2 $$\sigma $$ σ obtained under the assumption that Wilks’ theorem applies.

scholarly journals Resolvingθ23degeneracy by accelerator and reactor neutrino oscillation experiments

2006 ◽  
Vol 73 (9) ◽  
Author(s):  
K. Hiraide ◽  
H. Minakata ◽  
T. Nakaya ◽  
H. Nunokawa ◽  
H. Sugiyama ◽  
...  
Keyword(s):  
Neutrino Oscillation ◽  
Reactor Neutrino

Vibration Characteristics of Violin Bow String and its Timbre Effect

2014 ◽  
Vol 670-671 ◽  
pp. 1130-1133
Author(s):  
Guo Ming Zhao
Keyword(s):  
Spectral Analysis ◽  
Spectrum Analysis ◽  
Vibration Spectrum ◽  
Vibration Characteristics ◽  
Thickness Effect ◽  
Spring Model ◽  
Mass Spring Model ◽  
Modes Of Vibration ◽  
Mass Spring ◽  
Sound Judgment

This paper analyzes the modes of vibration of the strings and the strings of the material, the thickness effect on pronunciation, the establishment of a mass-spring model of vibrating strings and studied when the force pulling the strings and plucked violins panel vibration. Spectrum analysis and processing by MATLAB, the vibration of the resonance box is directly converted into sound, a sound judgment using spectral analysis methods.

scholarly journals Appearance–disappearance relation in 3 + Ns short-baseline neutrino oscillations

2016 ◽  
Vol 31 (01) ◽  
pp. 1650003 ◽  
Author(s):  
C. Giunti ◽  
E. M. Zavanin
Keyword(s):  
Neutrino Oscillation ◽  
Neutrino Oscillations ◽  
Neutrino Mixing ◽  
Short Baseline ◽  
Mixing Schemes ◽  
Existing Data

We derive the relation between the amplitudes of short-baseline appearance and disappearance oscillations in [Formula: see text] neutrino mixing schemes which is the origin of the appearance–disappearance tension that is found from the analysis of the existing data in any [Formula: see text] neutrino mixing scheme. We illustrate the power of the relation to reveal the appearance–disappearance tension in the cases of [Formula: see text] and [Formula: see text] mixing using the results of global fits of short-baseline neutrino oscillation data.

scholarly journals REVIEW OF REACTOR NEUTRINO OSCILLATION EXPERIMENTS

2012 ◽  
Vol 27 (08) ◽  
pp. 1230010 ◽  
Author(s):  
C. MARIANI
Keyword(s):  
Neutrino Physics ◽  
Neutrino Oscillation ◽  
Current Status ◽  
Daya Bay ◽  
Neutrino Mixing ◽  
Mixing Angle ◽  
Double Chooz ◽  
Reactor Neutrino ◽  
Neutrino Experiments ◽  
Near Future

In this document we will review the current status of reactor neutrino oscillation experiments and present their physics potentials for measuring the θ13 neutrino mixing angle. The neutrino mixing angle θ13 is currently a high-priority topic in the field of neutrino physics. There are currently three different reactor neutrino experiments, DOUBLE CHOOZ, DAYA BAY and RENO and a few accelerator neutrino experiments searching for neutrino oscillations induced by this angle. A description of the reactor experiments searching for a nonzero value of θ13 is given, along with a discussion of the sensitivities that these experiments can reach in the near future.

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