Prospects of light sterile neutrino searches in long-baseline neutrino oscillations
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Springer
Received: December 9, Revised: May 4, Accepted: May 26, Published: June 15,
2019 2020 2020 2020
Yakefu Reyimuajia and Chun Liua,b a
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China b School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
E-mail: [email protected], [email protected] Abstract: The neutrino oscillation probabilities in vacuum and matter are discussed, considering the framework of three active and one light sterile neutrinos. We study in detail the rephasing invariants and CP asymmetry observables, and investigate the fourneutrino oscillations in long-baseline neutrino experiments, such as DUNE, NOνA and T2HK. Our results show that the matter effect enhances quite a significantly the oscillation probabilities of electron neutrino and electron antineutrino appearance channels within a certain energy range, while no considerable change arises in the CP asymmetry analysis due to the matter effect. Moreover, separation between the results with and without the sterile neutrino is not so significant and that is also affected by CP-violating phases. Comparing the results for these three experiments, all of them have similar features, nevertheless, sizes and separations of the oscillation probabilities in DUNE are bit larger. Keywords: Beyond Standard Model, Neutrino Physics ArXiv ePrint: 1911.12524
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP06(2020)094
JHEP06(2020)094
Prospects of light sterile neutrino searches in long-baseline neutrino oscillations
Contents 1 Introduction
1
2 Matter effects in 3+1 neutrino scheme
3 10
4 Implications for long-baseline experiments
14
5 Summary and conclusion
19
A Matter-induced effective mass squares
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B Derivation of the relations between mixing matrix in matter and vacuum 23 µs C Expression of the J13
1
26
Introduction
Known for their invisible and illusive behaviors, originated from very weak interaction strength and being the lightest and electrically neutral fermion observed so far, neutrinos are one of the most appealing elementary particles in the present-day physics. Along with having made quite a number of progresses in understanding the properties of three types neutrinos, many things have ceased to become mystery anymore. But still there have been some puzzles and bottlenecks looming ahead and several questions have yet to be answered. In particular, there are several compelling anomalies that cannot be explained within the standard paradigm of three-neutrino mixing: 1) unexpected excess of ν¯e events in ν¯µ → ν¯e transition observed by the LSND experiment [1] as well as an excess discovered in both νe and ν¯e channels in the MiniBooNE experiment [2], which are so called shortbaseline anomalies; 2) observed rate deficit of ν¯e in several reactor experiments compared to theoretical expectation [3–5]; 3) a rate deficit in the disappearance channel of νe in radiochemical e
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