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![Allowed region for NSI parameters in ε L/R e plane obtained in the present work. The parameters ε L τ and ε R τ are fixed to zero. Both HZ-(filled red) and LZ-(dashed red) SSM's were assumed. The bounds from LSND [54, 79] and TEXONO [80] are provided for comparison. Besides, the contour obtained from the global analysis of solar neutrino experiments is presented by dashed black line (ref. [63], NSI's are included in detection and propagation). All contours correspond to 90% C.L. (2 d.o.f.). The dotted gray lines represent the corresponding range of ε parameter, relevant for NSI's at propagation.](publication/339142788/figure/fig3/AS:871648244805633@1584828544892/Allowed-region-for-NSI-parameters-in-e-L-R-e-plane-obtained-in-the-present-work-The.png)
Allowed region for NSI parameters in ε L/R e plane obtained in the present work. The parameters ε L τ and ε R τ are fixed to zero. Both HZ-(filled red) and LZ-(dashed red) SSM's were assumed. The bounds from LSND [54, 79] and TEXONO [80] are provided for comparison. Besides, the contour obtained from the global analysis of solar neutrino experiments is presented by dashed black line (ref. [63], NSI's are included in detection and propagation). All contours correspond to 90% C.L. (2 d.o.f.). The dotted gray lines represent the corresponding range of ε parameter, relevant for NSI's at propagation.
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A bstract
The Borexino detector measures solar neutrino fluxes via neutrino-electron elastic scattering. Observed spectra are determined by the solar- ν e survival probability P ee ( E ), and the chiral couplings of the neutrino and electron. Some theories of physics beyond the Standard Model postulate the existence of Non-Standard Interactions (NS...
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Citations
... The Borexino was the first experiment that has detected and then precisely measured all solar neutrino fluxes (except for the hep-neutrino) [28][29][30][31][32][33][34] and has also registered antineutrinos emitted in decay of radionuclides naturally occurring within the Earth [38][39][40][41]. The Borexino detector is perfectly suited for the study of other fundamental problems, as well as searching for rare and exotic processes in particle physics and astrophysics [42][43][44][45][46][47][48][49]. Additionally, temporal correlations with transient astrophysical sources such as γ -ray bursts [50], gravitational wave events [9], solar flares [44], and fast radio burst [51] have been performed. ...
The search for neutrino events in correlation with gravitational wave (GW) events for three observing runs (O1, O2 and O3) from 09/2015 to 03/2020 has been performed using the Borexino data-set of the same period. We have searched for signals of neutrino-electron scattering and inverse beta-decay (IBD) within a time window of $$\pm \, 1000$$ ± 1000 s centered at the detection moment of a particular GW event. The search was done with three visible energy thresholds of 0.25, 0.8 and 3.0 MeV. Two types of incoming neutrino spectra were considered: the mono-energetic line and the supernova-like spectrum. GW candidates originated by merging binaries of black holes (BHBH), neutron stars (NSNS) and neutron star and black hole (NSBH) were analyzed separately. Additionally, the subset of most intensive BHBH mergers at closer distances and with larger radiative mass than the rest was considered. In total, follow-ups of 74 out of 93 gravitational waves reported in the GWTC-3 catalog were analyzed and no statistically significant excess over the background was observed. As a result, the strongest upper limits on GW-associated neutrino and antineutrino fluences for all flavors ( $$\nu _e, \nu _\mu , \nu _\tau $$ ν e , ν μ , ν τ ) at the level $$10^9{-}10^{15}~\textrm{cm}^{-2}\,\textrm{GW}^{-1}$$ 10 9 - 10 15 cm - 2 GW - 1 have been obtained in the 0.5–5 MeV neutrino energy range.
... Their χ 2analysis takes into account the data from LEP experiments (ALEPH, DELPHI, L3, and OPAL), LSND experiment, reactor experiments (MUNU and Rovno), and CHARM II experiment. The Borexino experiment has performed oneparameter fits [34] leading to the loosest bound. ...
Nonstandard neutrino interactions (NSI) arising from light and heavy mediators probe different sectors of the parameter space of models focusing on phenomena that require the extension of the standard model. High-energy scattering experiments are not relevant on constraining the NSI hiding a light mediator at the fundamental level, while flavor-universal NSI cannot be probed with neutrino oscillation experiments. Currently the only way to measure flavor-universal NSI with a light mediator is to rely on coherent elastic neutrino-nucleon scattering experiments, which we use to derive bounds for light mediator flavor-universal NSI. For light NSI, we obtain ϵu∈[−14.85,14.79] and ϵd=[−13.19,13.84] (90% CL.). We also derive constraints on flavor-universal heavy NSI and find a 2σ tension. Finally, we discuss the implications of the experiments on the allowed parameter space of a specific example model, called superweak extension of the standard model.
... This would impact the data at both SK and Borexino, and makes the problem much more demanding from the computational point of view. Constraints on NC NSI with electrons were obtained from the analysis of Borexino Phase-II spectrum by the Borexino Collaboration [42] assuming only one NC NSI coupling at a time. Recently, in Ref. [43] we performed an analysis of the Borexino Phase-II spectral data including all NC NSI operators involving electrons simultaneously in the fit. ...
We derive new constraints on effective four-fermion neutrino non-standard interactions with both quarks and electrons. This is done through the global analysis of neutrino oscillation data and measurements of coherent elastic neutrino-nucleus scattering (CEvNS) obtained with different nuclei. In doing so, we include not only the effects of new physics on neutrino propagation but also on the detection cross section in neutrino experiments which are sensitive to the new physics. We consider both vector and axial-vector neutral-current neutrino interactions and, for each case, we include simultaneously all allowed effective operators in flavour space. To this end, we use the most general parametrization for their Wilson coefficients under the assumption that their neutrino flavour structure is independent of the charged fermion participating in the interaction. The status of the LMA-D solution is assessed for the first time in the case of new interactions taking place simultaneously with up quarks, down quarks, and electrons. One of the main results of our work are the presently allowed regions for the effective combinations of non-standard neutrino couplings, relevant for long-baseline and atmospheric neutrino oscillation experiments.
... The Borexino experiment has obtained new results on neutrino properties: ruled out any significant day-night asymmetry of the 7 Be neutrino interaction rate [42], it has set new limits on the effective magnetic moment of neutrinos [28], on the flux ofν e from the Sun [43,44] and on the non-standard neutrino interactions [45]. A search for a number of rare low-energy processes has been carried out: possible violation of the Pauli exclusion principle [46], high-energy solar axions [47], heavy sterile neutrino mixing in the 8 B β +decay [48], decay of an electron into a neutrino and a photon [49]. ...
The search for neutrino events in correlation with gravitational wave (GW) events for three observing runs (O1, O2 and O3) from 09/2015 to 03/2020 has been performed using the Borexino data-set of the same period. We have searched for signals of neutrino-electron scattering with visible energies above 250 keV within a time window of 1000 s centered at the detection moment of a particular GW event. Two types of incoming neutrino spectra were considered: the mono-energetic line and the spectrum expected from supernovae. The same spectra were considered for electron antineutrinos detected through inverse beta-decay (IBD) reaction. GW candidates originated by merging binaries of black holes (BHBH), neutron stars (NSNS) and neutron star and black hole (NSBH) were analysed separately. In total, follow-ups of 74 out of 93 gravitational waves reported in the GWTC-3 catalog were analyzed and no statistically significant excess over the background was observed. As a result, the strongest upper limits on GW-associated neutrino and antineutrino fluences for all flavors (\nu_e, \nu_\mu, \nu_\tau) have been obtained in the (0.5 - 5.0) MeV neutrino energy range.
... In spite of their copious flux at Earth (about 6 × 10 10 νcm −2 s −1 ), detecting solar neutrinos is experimentally challenging: it requires large volume detectors and lowbackground environment. Nonetheless, the study of solar neutrinos has been very rewarding: on one hand, it has provided a confirmation of the Standard Solar Model (SSM) flux predictions [1]; on the other hand, it has proven that neutrinos oscillate (and therefore have mass), it has allowed to determine the oscillation parameters ∆m 2 12 and θ 12 [2] and to probe new physics beyond the Standard Model [3]. ...
The Jiangmen Underground Neutrino Observatory (JUNO), the first multi-kton liquid scintillator detector, which is under construction in China, will have a unique potential to perform a real-time measurement of solar neutrinos well below the few MeV threshold typical for Water Cherenkov detectors. JUNO's large target mass and excellent energy resolution are prerequisites for reaching unprecedented levels of precision. In this paper, we provide estimation of the JUNO sensitivity to 7Be, pep, and CNO solar neutrinos that can be obtained via a spectral analysis above the 0.45 MeV threshold. This study is performed assuming different scenarios of the liquid scintillator radiopurity, ranging from the most opti mistic one corresponding to the radiopurity levels obtained by the Borexino experiment, up to the minimum requirements needed to perform the neutrino mass ordering determination with reactor antineutrinos - the main goal of JUNO. Our study shows that in most scenarios, JUNO will be able to improve the current best measurements on 7Be, pep, and CNO solar neutrino fluxes. We also perform a study on the JUNO capability to detect periodical time variations in the solar neutrino flux, such as the day-night modulation induced by neutrino flavor regeneration in Earth, and the modulations induced by temperature changes driven by helioseismic waves.
... We have carefully studied this opportunity, parametrising the effect of nonstandard interactions in terms of a single parameter ϵ ′ . 28 Fig. 4 shows that with the current theoretical and experimental uncertainties there is still quite a lot of room for new physics and that the future better measurement of this curve might be worth pursuing. ...
... Vacuum oscillations scenario with LMA-MSW parameters is also shown (grey band). The definition of the non-standard interaction parameter is that of reference.28 ...
... Allowed region for NSI parameters in ε L/R e plane obtained in.29 The parameters ε L/R τ are fixed at zero. ...
... Global fits to oscillation data have been performed for NSI with quarks [106][107][108] and set relatively strong bounds on the size of the off-diagonal NSI coefficients. For NSI with electrons, NSI limits from single experiments are available (e.g. for Borexino [109] or IceCube [110]) as well as from the combination of ν − e scattering experiments and collider measurements [111]. The combination of solar and reactor neutrino data has also been studied in e.g. ...
Neutrinos are one of the most promising messengers for signals of new physics Beyond the Standard Model (BSM). On the theoretical side, their elusive nature, combined with their unknown mass mechanism, seems to indicate that the neutrino sector is indeed opening a window to new physics. On the experimental side, several long-standing anomalies have been reported in the past decades, providing a strong motivation to thoroughly test the standard three-neutrino oscillation paradigm. In this Snowmass21 white paper, we explore the potential of current and future neutrino experiments to explore BSM effects on neutrino flavor during the next decade.
... In figure 9, h + denotes the responsible charged scalar field, and f is the relevant Yukawa term contributing to the neutrino magnetic moments. The colour shaded regions are excluded from current experimental searches: the light blue shaded region is excluded from charged Higgs searches at LEP experiment; the red shaded region is excluded from Borexino NSI searches [73]; NSI from the global fit to neutrino oscillation data [74] constrains dark green shaded region, IceCube atmospheric data [75] on NSI imposes bound as indicated by light green shaded region; the yellow shaded region is bounded from τ lifetime constraints [6]; the gray shaded region is excluded from neutrino magnetic moment searches at Borexino experiment [26]. There is an LEP mono-photon search limit [76] as well; however, we find that it is comparatively less constrained than the above-mentioned scenarios. ...
A core-collapse supernova (SN) offers an excellent astrophysical laboratory to test non-zero neutrino magnetic moments. In particular, the neutronization burst phase, which lasts for a few tens of milliseconds post-bounce, is dominated by electron neutrinos and can offer exceptional discovery potential for transition magnetic moments. We simulate the neutrino spectra from the burst phase in forthcoming neutrino experiments like the Deep Underground Neutrino Experiment (DUNE), and the Hyper-Kamiokande (HK), by taking into account spin-flavour conversions of supernova neutrinos caused by interactions with ambient magnetic fields. We find that the sensitivities to neutrino transition magnetic moments which can be explored by these experiments for a galactic SN are an order to several orders of magnitude better than the current terrestrial and astrophysical limits. Additionally, we also discuss how this realization might provide light on three important neutrino properties: (a) the Dirac/Majorana nature, (b) the neutrino mass ordering, and (c) the neutrino mass-generation mechanism.
... Due to its unprecedented radio-purity, Borexino has also set a lot of limits on rare processes (see e.g. [10][11][12][13][14]) and performed other neutrino physics studies, e.g. geo-neutrino detection (for review, see e.g. ...
Borexino recently reported the first experimental evidence for a CNO neutrino. Since this process accounts for only about 1% of the Sun’s total energy production, the associated neutrino flux is remarkably low compared to that of the pp chain, the dominant hydrogen-burning process. This experimental evidence for the existence of CNO neutrinos was obtained using a highly radio-pure Borexino liquid scintillator. Improvements in the thermal stabilization of the detector over the last five years have allowed us to exploit a method of constraining the rate of 210Bi background. Since the CNO cycle is dominant in massive stars, this result is the first experimental evidence of a major stellar hydrogen-to-helium conversion mechanism in the Universe.
