Statistical significance of the sterile-neutrino hypothesis in the context of reactor and gallium data

Berryman, Jeffrey M.; Coloma, Pilar; Schwetz, Thomas; Zhou, Albert

doi:10.1007/jhep02(2022)055

Cited by 48 publications

(45 citation statements)

References 78 publications

(183 reference statements)

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“…In particular, the 90% CL upper bound (GS98 solar model) implies sin 2 2θ 14 0.07, which is in conflict with the full 2σ region reported by the Neutrino-4 experiment [16]. A combined analysis of solar and reactor neutrino data will be presented in a forthcoming publication [56], which will provide a quantitative assessment of the impact of solar neutrino data on possible hints from reactor experiments.…”

Section: Summary and Discussionmentioning

confidence: 95%

Testing sterile neutrino mixing with present and future solar neutrino data

Goldhagen,

Maltoni,

Reichard

et al. 2021

Preprint

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We investigate the sensitivity of solar neutrino data to mixing of sterile neutrinos with masses eV. For current data we perform a Feldman-Cousins analysis to derive a robust limit on the sterile neutrino mixing. The solar neutrino limit excludes significant regions of the parameter space relevant for hints from reactor experiments. Then we study the sensitivity of upcoming solar neutrino data, most notably elastic neutrino-electron scattering in the DARWIN and DUNE experiments, as well as coherent neutrino-nucleus scattering in DARWIN. These high precision measurements will increase the sensitivity to sterile neutrino mixing by about a factor of 4.5 compared to present limits. As a by-product we introduce a simplified solar neutrino analysis using only four data points: the low and high energy ν e survival and transition probabilities. We show that this simplified analysis is in excellent agreement with a full solar neutrino analysis; it is very easy to handle numerically and can be applied to any new physics model in which the energy dependence of the ν e transition probabilities is not significantly modified.

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Section: Summary and Discussionmentioning

confidence: 95%

Testing sterile neutrino mixing with present and future solar neutrino data

Goldhagen,

Maltoni,

Reichard

et al. 2021

Preprint

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“…Moreover, the reactor antineutrino anomaly has been revised and reduced recently [52,53]. On the other hand, the Gallium anomaly has been reinforced by the recent results of the BEST experiment [55], but it is in tension with the reactor data [53], with the negative results of the DANSS [108], PROSPECT [109], and STEREO [110] experiments [56], and with the solar bound [53,57,111]. Considering the SBL ν µ → ν e appearance channel, the MiniBooNE low-energy anomaly [39,40] has been recently disfavored by the results of the MicroBooNE experiment [58][59][60] (see, however, the caveats in Ref.…”

Section: Comparison With Sbl Neutrino Oscillation Experimentsmentioning

confidence: 99%

“…[54], has been recently revived by the result of the BEST experiment [55] (see also the discussions in Refs. [53,56,57]). Considering the ν µ → ν e appearance channel, the new results of the MicroBooNE experiment [58][59][60] disfavour the sterile neutrino interpretation of the MiniBooNE anomaly as an electron neutrino appearance from a muon neutrino beam (see, however, the discussion in Ref.…”

Section: Introductionmentioning

confidence: 99%

Pseudoscalar sterile neutrino self-interactions in light of Planck, SPT and ACT data

Corona,

Murgia,

Cadeddu

et al. 2021

Preprint

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We reassess the viability of a cosmological model including a fourth additional sterile neutrino species that self-interacts through a new pseudoscalar degree of freedom. To that end, we perform a series of extensive analyses fitting various combinations of cosmic microwave background (CMB) data from Planck, the Atacama Cosmology Telescope (ACT) and the South Pole Telescope (SPT), both alone and in combination with Baryon Acoustic Oscillation (BAO) and Supernova Ia (SnIa) observations. We show that the scenario under study, although capable to resolve the Hubble tension without worsening the so-called S 8 tension about the growth of structures, is severely constrained by high-multipole polarization data from both Planck and SPT. Intriguingly, when trading Planck TE-EE data for those from ACT, we find a 3σ preference for a non-zero sterile neutrino mass, m s = 3.6 +1.1 −0.6 eV (68% C.L.), compatible with the range suggested by longstanding short-baseline (SBL) anomalies in neutrino oscillation experiments. The preference is mostly driven by ACT favouring a higher value for the primordial spectral index n s with respect to Planck and SPT. The pseudoscalar model appears indeed to provide a better fit to ACT data with respect to ΛCDM (∆χ 2 −5). In particular, we show that the mild tension between Planck and ACT is due to the different pattern in the TE and EE power spectra on multipoles between 350 1000. We also check the impact of marginalizing over the gravitational lensing information in Planck data, showing that the model does not solve the CMB lensing anomaly. Future work including higher precision data from current and upcoming CMB ground-based experiments will be crucial to test these results. Contents 1 Introduction 1 2 The pseudoscalar sterile neutrino self-interaction model 4 3 Methods and data 4 4 Results 5 4.1 Planck + A TTTEEE L + A φφ L 6 4.2 Planck TT + SPT 8 4.3 Planck TT + ACT 9 4.4 Best-fit cosmology and its impact on the CMB 10 5 Planck vs ACT: a deeper look 13 6 Comparison with SBL neutrino oscillation experiments 16 7 Conclusions 18 A Best-fit parameter values and χ 2 per experiment 20 B Additional triangle plots 22 C Impact on the linear matter power spectrum 22 Pseudoscalar model Parameter ACT +BAO+SnIa Planck +ACT +BAO+SnIa 100 ω b 2.185 +0.

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“…The ν e → ν e has now been updated by the data collected by BEST [49], which strongly favors rather large mixing angle and masses larger than 1 eV 2 . Concerning the reactor anomalies, a recent reevaluation of the neutrino fluxes [50] has led to new global analyses [51,52] showing that combined reactor data are consistent with no sterile-neutrino oscillations. Despite the recent progress in all oscillation channels, new experimental data is still needed to fully assess the sterile neutrino option.…”

Section: A Active-sterile Neutrino Oscillationsmentioning

confidence: 99%

Neutrino Flavor Conversions in High-Density Astrophysical and Cosmological Environments

Capozzi,

Saviano

2022

Preprint

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Despite being a well understood phenomenon in the context of current terrestrial experiments, neutrino flavor conversions in dense astrophysical environments probably represent one of the most challenging open problems in neutrino physics. Apart from being theoretically interesting, such a problem has several phenomenological implications in cosmology and in astrophysics, including the primordial nucleosynthesis of light elements abundance and other cosmological observables, nucleosynthesis of heavy nuclei and the explosion of massive stars. In this review, we briefly summarize the state of the art on this topic, focusing on three environments: early universe, core-collapse supernovae and compact binary mergers.

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Statistical significance of the sterile-neutrino hypothesis in the context of reactor and gallium data

Cited by 48 publications

References 78 publications

Testing sterile neutrino mixing with present and future solar neutrino data

Testing sterile neutrino mixing with present and future solar neutrino data

Pseudoscalar sterile neutrino self-interactions in light of Planck, SPT and ACT data

Neutrino Flavor Conversions in High-Density Astrophysical and Cosmological Environments

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