Search for electron-neutrino transitions to sterile states in the BEST experiment

Barinov, Vladislav; Cleveland, B. T.; Danshin, S. N.; Ejiri, H.; Elliott, S. R.; Frekers, D.; Гаврин, В. Н.; Gorbachev, V. V.; Gorbunov, Dmitrii S.; Haxton, W. C.; Ибрагимова, Т. В.; Kim, In‐Wook; Kozlova, Yu. P.; Kravchuk, L.; Kuzminov, V. V.; Лубсандоржиев, Б.; Malyshkin, Y. M.; Massarczyk, R.; Matveev, V.; Mirmov, I. N.; Nico, J. S.; Петелин, А. Л.; Robertson, R. G. H.; Sinclair, D.; Shikhin, A. A.; Тарасов, В.А.; Trubnikov, G. V.; Veretenkin, E. P.; Wilkerson, J. F.; Zvir, A. I.

doi:10.1103/physrevc.105.065502

Cited by 62 publications

(47 citation statements)

References 68 publications

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“…1(a), where we plotted the ratios of observed and predicted rates versus the average path lengths of the neutrinos (about 1.9 m for GALLEX and 0.6 m for SAGE). The figure shows also the results of the recent BEST source experiment [7,8], where a larger deficit was observed, confirming the Gallium Anomaly. The two BEST values in Fig.…”

Section: The Gallium Anomalysupporting

confidence: 73%

“…[1][2][3][4][5][6]). Most puzzling is the large Gallium Anomaly, which has been recently revived by the results of the BEST experiment [7,8]. In this paper we discuss the status of shortbaseline ν e and νe disappearance and we compare the neutrino oscillation explanation of the Gallium Anomaly with the constraints from other experiments.…”

Section: Introductionmentioning

confidence: 92%

“…The two BEST values in Fig. 1(a) show the ratio of observed and predicted rates in the two nested 71 Ga volumes of the experiment, which correspond to average neutrino path lengths of about 0.5 m and 1.1 m [7,8]. Although the ratios shown in Fig.…”

Section: The Gallium Anomalymentioning

confidence: 99%

“…Currently, the Reactor Antineutrino Anomaly is regarded to be resolved or, at least, diminished with the new refinements of reactor flux models [13,14], but the Gallium Anomaly is reinforced by the new measurements of the BEST experiment [7,8]. Therefore, it is desirable to pay special attention to the Gallium Anomaly, and look for possible viable solutions.…”

Section: Introductionmentioning

confidence: 99%

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Gallium Anomaly: Critical View from the Global Picture of $ν_{e}$ and $\barν_{e}$ Disappearance

Giunti¹,

Li²,

Ternes³

et al. 2022

Preprint

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The significance of the Gallium Anomaly, from the BEST, GALLEX, and SAGE radioactive source experiments, is quantified using different theoretical calculations of the neutrino detection cross section, and its explanation due to neutrino oscillations is compared with the bounds from the analyses of reactor rate and spectral ratio data, β-decay data, and solar neutrino data. In the 3+1 active-sterile neutrino mixing scheme, the Gallium Anomaly is in strong tension with the individual and combined bounds of these data sets. In the combined scenario with all available data, the parameter goodness of fit is below 0.042%, corresponding to a severe tension of 4-5σ, or stronger. Therefore, we conclude that one should pursue other possible solutions beyond short-baseline oscillations for the Gallium Anomaly. We also present a new global fit of νe and νe disappearance data, showing that there is a 2.6-3.3σ preference in favor of short-baseline oscillations, which is driven by an updated analysis of reactor spectral ratio data. Contents I. Introduction 1 II. The Gallium Anomaly 2 III. The reactor rates constraints 4 IV. Short-baseline reactor spectral ratios 5 V. Combined short-baseline reactor spectral ratios and rates 6 VI. The KATRIN limit 8 VII. Combination of short-baseline reactor data and Tritium constraints 12 VIII. The solar neutrino bound 13 IX. Global ν e and νe disappearance analysis 15 X. Summary and conclusions 17 References 19

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Section: The Gallium Anomalysupporting

confidence: 73%

Section: Introductionmentioning

confidence: 92%

Section: The Gallium Anomalymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gallium Anomaly: Critical View from the Global Picture of $ν_{e}$ and $\barν_{e}$ Disappearance

Giunti¹,

Li²,

Ternes³

et al. 2022

Preprint

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“…A recent paper considering a wide range of experiments found > 5σ evidence for sterile neutrinos [683]. This is largely due to neutrino flux measurements at two distances from the radioactive chromium-51 source in the Baksan Experiment on Sterile Transitions (BEST [684][685][686]). These experiments favour sterile neutrino masses significantly above 1 eV/c 2 , a region of parameter space which is often not analysed due to the difficulties this would pose for ΛCDM.…”

Section: L14mentioning

confidence: 99%

From Galactic Bars to the Hubble Tension: Weighing Up the Astrophysical Evidence for Milgromian Gravity

Banik

Zhao

2022

Symmetry

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Astronomical observations reveal a major deficiency in our understanding of physics—the detectable mass is insufficient to explain the observed motions in a huge variety of systems given our current understanding of gravity, Einstein’s General theory of Relativity (GR). This missing gravity problem may indicate a breakdown of GR at low accelerations, as postulated by Milgromian dynamics (MOND). We review the MOND theory and its consequences, including in a cosmological context where we advocate a hybrid approach involving light sterile neutrinos to address MOND’s cluster-scale issues. We then test the novel predictions of MOND using evidence from galaxies, galaxy groups, galaxy clusters, and the large-scale structure of the universe. We also consider whether the standard cosmological paradigm (LCDM) can explain the observations and review several previously published highly significant falsifications of it. Our overall assessment considers both the extent to which the data agree with each theory and how much flexibility each has when accommodating the data, with the gold standard being a clear a priori prediction not informed by the data in question. Our conclusion is that MOND is favoured by a wealth of data across a huge range of astrophysical scales, ranging from the kpc scales of galactic bars to the Gpc scale of the local supervoid and the Hubble tension, which is alleviated in MOND through enhanced cosmic variance. We also consider several future tests, mostly at scales much smaller than galaxies.

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Testing Explanations of Short Baseline Neutrino Anomalies

Foppiani

2023

Springer Theses

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The experimental observation of neutrino oscillations profoundly impacted the physics of neutrinos, from being well understood theoretically to requiring new physics beyond the standard model of particle physics. Indeed, the mystery of neutrino masses implies the presence of new particles never observed before, often called sterile neutrinos, as they would not undergo standard weak interactions. And while neutrino oscillation measurements entered the precision era, reaching percentlevel precision, many experimental results show significant discrepancies with the standard model, at baselines much shorter than typical oscillation baselines. Such experimental measurements include LSND, MiniBooNE, gallium experiments, and reactor antineutrino measurements. These short baseline anomalies seem to be explainable by the addition of a light sterile neutrino, with mass in the 1 − 10 eV range. However, this hypothesis is in strong tension with many null experimental observations. Other explanations that rely on models containing sterile states with masses in the 1 − 500 MeV could resolve the tension. In this thesis, we test both classes of models. On the one hand, we look for datasets collected at a short baseline which can constrain heavy sterile neutrino models. We find that the minimal model is fully constrained, but several extensions of this model could weaken the current constraint and be tested with current and future datasets. On the other hand, we test the presence of neutrino oscillations at short baselines, induced by a light sterile state, with the data collected by the MicroBooNE experiment, a liquid argon time projection chamber specifically designed to resolve the details of each neutrino interaction. We report null results from both analyses, further constraining the space of possible explanations for the short baseline anomalies. If new physics lies behind the short baseline anomaly puzzle, it is definitely not described by a simple model.

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Search for electron-neutrino transitions to sterile states in the BEST experiment

Cited by 62 publications

References 68 publications

Gallium Anomaly: Critical View from the Global Picture of $ν_{e}$ and $\barν_{e}$ Disappearance

Gallium Anomaly: Critical View from the Global Picture of $ν_{e}$ and $\barν_{e}$ Disappearance

From Galactic Bars to the Hubble Tension: Weighing Up the Astrophysical Evidence for Milgromian Gravity

Testing Explanations of Short Baseline Neutrino Anomalies

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