Studying the neutrino wave-packet effects at medium-baseline reactor neutrino oscillation experiments and the potential benefits of an extra detector

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.

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Statistical interpretation of sterile neutrino oscillation searches at reactors

The European Physical Journal C ◽

10.1140/epjc/s10052-020-08774-2 ◽

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.

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

Advances in High Energy Physics ◽

10.1155/2020/8526034 ◽

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.

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Resolvingθ23degeneracy by accelerator and reactor neutrino oscillation experiments

Physical Review D ◽

10.1103/physrevd.73.093008 ◽

2006 ◽

Vol 73 (9) ◽

Cited By ~ 33

Author(s):

K. Hiraide ◽

H. Minakata ◽

T. Nakaya ◽

H. Nunokawa ◽

H. Sugiyama ◽

...

Keyword(s):

Neutrino Oscillation ◽

Reactor Neutrino

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REVIEW OF REACTOR NEUTRINO OSCILLATION EXPERIMENTS

Modern Physics Letters A ◽

10.1142/s0217732312300108 ◽

2012 ◽

Vol 27 (08) ◽

pp. 1230010 ◽

Cited By ~ 5

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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