Daya Bay experiment measures final neutrino mixing angle

Physics Today ◽  
2012 ◽  
Keyword(s):  
Daya Bay ◽  
Neutrino Mixing ◽  
Mixing Angle

scholarly journals CHARGED LEPTON CORRECTION TO TRI-BIMAXIMAL LEPTON MIXING AND ITS IMPLICATIONS TO NEUTRINO PHENOMENOLOGY

2013 ◽  
Vol 28 (31) ◽  
pp. 1350131 ◽  
Author(s):  
SRINU GOLLU ◽  
K. N. DEEPTHI ◽  
R. MOHANTA
Keyword(s):  
Charged Lepton ◽  
Daya Bay ◽  
Neutrino Mixing ◽  
Mixing Angle ◽  
Quark Sector ◽  
Mass Matrices ◽  
Reactor Neutrino ◽  
Mixing Matrix ◽  
Neutrino Experiments ◽  
Reactor Mixing

The recent results from Daya Bay and RENO reactor neutrino experiments have firmly established that the smallest reactor mixing angle θ13 is nonvanishing at the 5 σ level, with a relatively large value, i.e. θ13 ≈ 9°. Using the fact that the neutrino mixing matrix can be represented as [Formula: see text], where Ul and Uν result from the diagonalization of the charged lepton and neutrino mass matrices and Pν is a diagonal matrix containing the Majorana phases and assuming the tri-bimaximal (TBM) form for Uν, we investigate the possibility of accounting for the large reactor mixing angle due to the corrections of the charged lepton mixing matrix. The form of Ul is assumed to be that of CKM mixing matrix of the quark sector. We find that with this modification it is possible to accommodate the large observed reactor mixing angle θ13. We also study the implications of such corrections on the other phenomenological observables.

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.

scholarly journals Recent results from reactor antineutrino experiments

2019 ◽  
Author(s):  
Hyunkwan Seo
Keyword(s):  
Oscillation Frequency ◽  
Reactor Fuel ◽  
Daya Bay ◽  
Neutrino Mixing ◽  
Mixing Angle ◽  
Reactor Antineutrino ◽  
Double Chooz ◽  
Antineutrino Flux

The smallest neutrino mixing angle \theta_{13}θ13 has been successfully measured by the disappearance of reactor antineutrinos at RENO, Daya Bay, and Double Chooz. The oscillation frequency is also measured based on energy and baseline dependent disappearance probability of reactor antineutrinos. Recent results find a variation in the observed reactor antineutrino flux as a function of the reactor fuel evolution. We report more precisely measured values of \theta_{13}θ13 and \Delta m_{ee}^2Δmee2 and results on the evolution of observed reactor antineutrino yield and spectrum.

scholarly journals LEPTON MIXING AND THE NEUTRINO MIXING ANGLE θ13

2012 ◽  
Vol 27 (14) ◽  
pp. 1250079 ◽  
Author(s):  
HARALD FRITZSCH
Keyword(s):  
Radiative Correction ◽  
Neutrino Oscillations ◽  
Daya Bay ◽  
Neutrino Mixing ◽  
Mixing Angle ◽  
Zero Mass ◽  
Mass Matrices ◽  
Texture Zero

We discuss the neutrino oscillations, using texture zero mass matrices for the leptons, including radiative correction. The neutrino mixing angle θ13 is calculated and agrees with the result of the new Daya Bay experiment.

scholarly journals Optimizing the determination of the neutrino mixing angle θ13 from reactor data

2014 ◽  
Vol 29 (20) ◽  
pp. 1450109 ◽  
Author(s):  
Amir N. Khan ◽  
Douglas W. McKay ◽  
John P. Ralston
Keyword(s):  
Hypothesis Test ◽  
Central Element ◽  
Daya Bay ◽  
Parameter Method ◽  
Model Parameters ◽  
Neutrino Mixing ◽  
Mixing Angle ◽  
Straightforward Method ◽  
Experimental Resolution

The technical breakthroughs of multiple detectors developed by Daya Bay and RENO collaborations have gotten great attention. Yet the optimal determination of neutrino mixing parameters from reactor data depends on the statistical method and demands equal attention. We find that a straightforward method using minimal parameters will generally outperform a multi-parameter method by delivering more reliable values with sharper resolution. We review standard confidence levels and statistical penalties for models using extra parameters, and apply those rules to our analysis. We find that the methods used in recent work of the Daya Bay and RENO collaborations have several undesirable properties. The existing work also uses nonstandard measures of significance which we are unable to explain. A central element of the current methods consists of variationally fitting many more parameters than data points. As a result, the experimental resolution of sin 2(2θ13) is degraded. The results also become extremely sensitive to certain model parameters that can be adjusted arbitrarily. The number of parameters to include in evaluating significance is an important issue that has generally been overlooked. The measures of significance applied previously would be consistent if and only if all parameters but one were considered to have no physical relevance for the experiment's hypothesis test. Simpler, more transparent methods can improve the determination of the mixing angle θ13 from reactor data, and exploit the advantages from superb hardware technique of the experiments. We anticipate that future experimental analysis will fully exploit those advantages.

scholarly journals CP Violating Tri-Bimaximal-Cabibbo Mixing

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
D. V. Ahluwalia
Keyword(s):  
Order Approximation ◽  
Atmospheric Neutrino ◽  
Daya Bay ◽  
Cabibbo Angle ◽  
Neutrino Mixing ◽  
Leading Order ◽  
Mixing Angle ◽  
Quark Mixing

In view of the new data from the Daya Bay and RENO collaborations, King has presented a very natural deformation of tri-bimaximal mixing. Here, we show that L/E flatness of the e-like event ratio in the atmospheric neutrino data, when coupled with King's observation that the smallest neutrino mixing angle, , seems to be related to the largest quark mixing angle (the Cabibbo angle ), leading to a CP violating tri-bimaximal-Cabibbo mixing. King's tri-bimaximal-Cabibbo mixing follows as a leading order approximation from our result.

scholarly journals Latest Results from Neutrino Oscillation Experiment Daya Bay

2019 ◽  
Vol 64 (7) ◽  
pp. 653
Author(s):  
V. Vorobel
Keyword(s):  
Mass Splitting ◽  
Current Status ◽  
Daya Bay ◽  
Neutrino Experiment ◽  
Neutrino Mixing ◽  
Mixing Angle ◽  
Reactor Antineutrino ◽  
Neutrino Oscillation Experiment ◽  
Reactor Neutrino ◽  
Antineutrino Flux

The Daya Bay Reactor Neutrino Experiment was designed to measure Θ13, the smallest mixing angle in the three-neutrino mixing framework, with unprecedented precision. The experiment consists of eight identically designed detectors placed underground at different baselines from three pairs of nuclear reactors in South China. Since Dec. 2011, the experiment has been running stably for more than 7 years, and has collected the largest reactor antineutrino sample to date. Daya Bay greatly improved the precision on Θ13 and made an independent measurement of the effective mass splitting in the electron antineutrino disappearance channel. Daya Bay also performed a number of other precise measurements such as a high-statistics determination of the absolute reactor antineutrino flux and the spectrum evolution, as well as a search for the sterile neutrino mixing, among others. The most recent results from Daya Bay are discussed in this paper, as well as the current status and future prospects of the experiment.

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