Browsing by Author "Parada, Alexander"
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Item Future perspectives for a weak mixing angle measurement in coherent elastic neutrino nucleus scattering experiments(Elsevier B.V., 2018-09-10) Cañas, Blanca C.; Garcés, Estela A.; Miranda, Omar G.; Parada, AlexanderAfter the first measurement of the coherent elastic neutrino nucleus scattering (CENNS) by the COHERENT Collaboration, it is expected that new experiments will confirm the observation. Such measurements will allow to put stronger constraints or discover new physics as well as to probe the Standard Model by measuring its parameters. This is the case of the weak mixing angle at low energies, which could be measured with an increased precision in future results of CENNS experiments using, for example, reactor antineutrinos. In this work we analyze the physics potential of different proposals for the improvement of our current knowledge of this observable and show that they are very promising. © 2018 The Author(s)Item Implications of NSI constraints from ANTARES and IceCube on a simplified Z′ model(Elsevier B.V., 2024) Cabarcas J.M.; Parada, Alexander; Quintero Poveda, NéstorRecently the neutrino experiments ANTARES and IceCube have released new constraints to the non-standard neutrino interaction (NSI) parameter ϵμτd (flavor off-diagonal). These new constraints are stronger than those obtained from a combination of COHERENT and neutrino oscillation data. In the light of the recent constraints from ANTARES and IceCube data on the NSI parameter ϵμτd, in this work, we study the new physics implications on the parameter space of a simplified Z′ model with lepton flavor violating (μτ) couplings. For a Z′ boson with a mass heavier than the τ lepton, our results show that ANTARES and IceCube can provide additional constraints to such a new physics scenario with μτ couplings, when compared to bounds from low-energy flavor physics. Moreover, these neutrino experiments can exclude a similar region than ATLAS experiment, showing the potential to provide complementary information to the one obtained from direct searches at the Large Hadron Collider. The impact of the expected sensitivity at DUNE and Belle II experiments is also studied.Item Neutrino scattering and the reactor antineutrino anomaly(Institute of Physics Publishing, 2017-12-20) Garcés, Estela A.; Cañas, Blanca C.; Miranda, Omar G.; Parada, AlexanderLow energy threshold reactor experiments have the potential to give insight into the light sterile neutrino signal provided by the reactor antineutrino anomaly and the gallium anomaly. In this work we analyze short baseline reactor experiments that detect by elastic neutrino electron scattering in the context of a light sterile neutrino signal. We also analyze the sensitivity of experimental proposals of coherent elastic neutrino nucleus scattering (CENNS) detectors in order to exclude or confirm the sterile neutrino signal with reactor antineutrinos. © Published under licence by IOP Publishing Ltd.Item New limits on neutrino magnetic moments from low energy neutrino data(Institute of Physics Publishing, 2016-10-19) Cañas, Blanca C.; Miranda, Omar G.; Parada, Alexander; Tórtola, Mariam Amparo; Valle, JoséW W.F.Here we give a brief review on the current bounds on the general Majorana transition neutrino magnetic moments (TNMM) which cover also the conventional neutrino magnetic moments (NMM). Leptonic CP phases play a key role in constraining TNMMs. While the Borexino experiment is the most sensitive to the TNMM magnitudes, one needs complementary information from reactor and accelerator experiments in order to probe the complex CP phases. © Published under licence by IOP Publishing Ltd. SciVal Topic ProminenceItem The reactor antineutrino anomaly and low energy threshold neutrino experiments(Elsevier B.V., 2018-01-10) Cañas, Blanca C.; Garcés, Estela A.; Miranda, Omar G.; Parada, AlexanderShort distance reactor antineutrino experiments measure an antineutrino spectrum a few percent lower than expected from theoretical predictions. In this work we study the potential of low energy threshold reactor experiments in the context of a light sterile neutrino signal. We discuss the perspectives of the recently detected coherent elastic neutrino–nucleus scattering in future reactor antineutrino experiments. We find that the expectations to improve the current constraints on the mixing with sterile neutrinos are promising. We also analyze the measurements of antineutrino scattering off electrons from short distance reactor experiments. In this case, the statistics is not competitive with inverse beta decay experiments, although future experiments might play a role when compare it with the Gallium anomaly. © 2017 The AuthorsItem Sterile neutrinos, dark matter, and resonant effects in ultra high energy regimes(Elsevier, 2015-05-01) Miranda, O. G.; Moura, Célio Adrega; Parada, AlexanderInterest in light dark matter candidates has recently increased in the literature; some of these works consider the role of additional neutrinos, either active or sterile. Furthermore, extragalactic neutrinos have been detected with energies higher than have ever been reported before. This opens a new window of opportunities to the study of neutrino properties that were unreachable up to now. We investigate how an interaction potential between neutrinos and dark matter might induce a resonant enhancement in the oscillation probability, an effect that may be tested with future neutrino data. © 2015 The Authors.Item Updating neutrino magnetic moment constraints(Elsevier, 2016-02-10) Cañas, Blanca C.; Miranda, Omar G.; Parada, Alexander; Tórtola, Mariam Amparo; Valle, JoséW W.F.In this paper we provide an updated analysis of the neutrino magnetic moments (NMMs), discussing both the constraints on the magnitudes of the three transition moments Λi and the role of the CP violating phases present both in the mixing matrix and in the NMM matrix. The scattering of solar neutrinos off electrons in Borexino provides the most stringent restrictions, due to its robust statistics and the low energies observed, below 1 MeV. Our new limit on the effective neutrino magnetic moment which follows from the most recent Borexino data is 3.1×10-11μB at 90% C.L. This corresponds to the individual transition magnetic moment constraints: |Λ1|≤5.6×10-11μB, |Λ2|≤4.0×10-11μB, and |Λ3|≤3.1×10-11μB (90% C.L.), irrespective of any complex phase. Indeed, the incoherent admixture of neutrino mass eigenstates present in the solar flux makes Borexino insensitive to the Majorana phases present in the NMM matrix. For this reason we also provide a global analysis including the case of reactor and accelerator neutrino sources, presenting the resulting constraints for different values of the relevant CP phases. Improved reactor and accelerator neutrino experiments will be needed in order to underpin the full profile of the neutrino electromagnetic properties. © 2015 The Authors.