The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Kento Asai - One of the best experts on this subject based on the ideXlab platform.
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Predictions for the Neutrino parameters in the minimal model extended by linear combination of U(1)$$_{L_e-L_\mu }$$Le-Lμ, U(1)$$_{L_\mu -L_\tau }$$Lμ-Lτ and U(1)$$_{B-L}$$B-L gauge symmetries
The European Physical Journal C, 2020Co-Authors: Kento AsaiAbstract:We study the minimal extensions of the Standard Model by a linear combination of U(1) $$_{L_e-L_\mu }$$ L e - L μ , U(1) $$_{L_\mu -L_\tau }$$ L μ - L τ and U(1) $$_{B-L}$$ B - L gauge symmetries, where three right-handed Neutrinos and one U(1)-breaking SU(2) $$_L$$ L singlet or doublet scalar are introduced. Because of the dependence on the lepton flavor, the structures of both Dirac and Majorana mass matrices of Neutrinos are restricted. In particular, the two-zero minor and texture structures in the mass matrix for the active Neutrinos are interesting. Analyzing these structures, we obtain uniquely all the Neutrino parameters, namely the Dirac CP phase $$\delta $$ δ , the Majorana CP phases $$\alpha _{2,3}$$ α 2 , 3 and the mass eigenvalues of the light Neutrinos $$m_i$$ m i as functions of the Neutrino mixing angles $$\theta _{12}$$ θ 12 , $$\theta _{23}$$ θ 23 , and $$\theta _{13}$$ θ 13 , and the squared mass differences $$\Delta m^2_{21}$$ Δ m 21 2 and $$\Delta m^2_{31}$$ Δ m 31 2 . In 7 minimal models which are consistent with the recent Neutrino oscillation data, we also obtain the predictions for the sum of the Neutrino masses $$\Sigma _i m_i$$ Σ i m i and the effective Majorana Neutrino mass $$\langle m_{\beta \beta }\rangle $$ ⟨ m β β ⟩ and compare them with the current experimental limits. In addition, we also discuss the implication of our results for leptogenesis.
W L Barrett - One of the best experts on this subject based on the ideXlab platform.
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measurement of Neutrino oscillations with the minos detectors in the numi beam
Physical Review Letters, 2008Co-Authors: P Adamson, C. Andreopoulos, K E Arms, R Armstrong, D J Auty, D S Ayres, B Baller, P D Barnes, G Barr, W L BarrettAbstract:This Letter reports new results from the MINOS experiment based on a two-year exposure to muon Neutrinos from the Fermilab NuMI beam. Our data are consistent with quantum-mechanical oscillations of Neutrino flavor with mass splitting |Δm^2|=(2.43±0.13)×10^-3 eV^2 (68% C.L.) and mixing angle sin^2(2θ)>0.90 (90% C.L.). Our data disfavor two alternative explanations for the disappearance of Neutrinos in flight: namely, Neutrino decays into lighter particles and quantum decoherence of Neutrinos, at the 3.7 and 5.7 standard-deviation levels, respectively.
C. Andreopoulos - One of the best experts on this subject based on the ideXlab platform.
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Measurement of the intrinsic electron Neutrino component in the T2K Neutrino beam with the ND280 detector
Physical Review D, 2014Co-Authors: J. Adam, H. Aihara, T. Akiri, C. Andreopoulos, S. Aoki, A. Ariga, T. Ariga, S. Assylbekov, D. Autiero, M. BarbiAbstract:The T2K experiment has reported the first observation of the appearance of electron Neutrinos in a muon Neutrino beam. The main and irreducible background to the appearance signal comes from the presence in the Neutrino beam of a small intrinsic component of electron Neutrinos originating from muon and kaon decays. In T2K, this component is expected to represent 1.2% of the total Neutrino flux. A measurement of this component using the near detector (ND280), located 280 m from the target, is presented. The charged current interactions of electron Neutrinos are selected by combining the particle identification capabilities of both the time projection chambers and electromagnetic calorimeters of ND280. The measured ratio between the observed electron Neutrino beam component and the prediction is 1.01+-0.10 providing a direct confirmation of the Neutrino fluxes and Neutrino cross section modeling used for T2K Neutrino oscillation analyses. Electron Neutrinos coming from muons and kaons decay are also separately measured, resulting in a ratio with respect to the prediction of 0.68+-0.30 and 1.10+-0.14, respectively.
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measurement of Neutrino oscillations with the minos detectors in the numi beam
Physical Review Letters, 2008Co-Authors: P Adamson, C. Andreopoulos, K E Arms, R Armstrong, D J Auty, D S Ayres, B Baller, P D Barnes, G Barr, W L BarrettAbstract:This Letter reports new results from the MINOS experiment based on a two-year exposure to muon Neutrinos from the Fermilab NuMI beam. Our data are consistent with quantum-mechanical oscillations of Neutrino flavor with mass splitting |Δm^2|=(2.43±0.13)×10^-3 eV^2 (68% C.L.) and mixing angle sin^2(2θ)>0.90 (90% C.L.). Our data disfavor two alternative explanations for the disappearance of Neutrinos in flight: namely, Neutrino decays into lighter particles and quantum decoherence of Neutrinos, at the 3.7 and 5.7 standard-deviation levels, respectively.
Francis Halzen - One of the best experts on this subject based on the ideXlab platform.
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High-energy Neutrino astrophysics
Nature Physics, 2017Co-Authors: Francis HalzenAbstract:Neutrinos from deep space can be used as astronomical messengers, providing clues about the origin of cosmic rays or dark matter. The IceCube experiment is leading the way in Neutrino astronomy. The chargeless, weakly interacting Neutrinos are ideal astronomical messengers as they travel through space without scattering, absorption or deflection. But this weak interaction also makes them notoriously difficult to detect, leading to Neutrino observatories requiring large-scale detectors. A few years ago, the IceCube experiment discovered Neutrinos originating beyond the Sun with energies bracketed by those of the highest energy gamma rays and cosmic rays. I discuss how these high-energy Neutrinos can be detected and what they can tell us about the origins of cosmic rays and about dark matter.
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Invited review article: IceCube: An instrument for Neutrino astronomy
Review of Scientific Instruments, 2010Co-Authors: Francis Halzen, Spencer R. KleinAbstract:Neutrino astronomy beyond the Sun was first imagined in the late 1950s; by the 1970s, it was realized that kilometer-scale Neutrino detectors were required. The first such instrument, IceCube, is near completion and taking data. The IceCube project transforms 1 km(3) of deep and ultratransparent Antarctic ice into a particle detector. A total of 5160 optical sensors is embedded into a gigaton of Antarctic ice to detect the Cherenkov light emitted by secondary particles produced when Neutrinos interact with nuclei in the ice. Each optical sensor is a complete data acquisition system including a phototube, digitization electronics, control and trigger systems, and light-emitting diodes for calibration. The light patterns reveal the type (flavor) of Neutrino interaction and the energy and direction of the Neutrino, making Neutrino astronomy possible. The scientific missions of IceCube include such varied tasks as the search for sources of cosmic rays, the observation of galactic supernova explosions, the search for dark matter, and the study of the Neutrinos themselves. These reach energies well beyond those produced with accelerator beams. The outline of this review is as follows: Neutrino astronomy and kilometer-scale detectors, high-energy Neutrino telescopes: methodologies of Neutrino detection, IceCube hardware, high-energy Neutrino telescopes: beyond astronomy, and future projects.
P Adamson - One of the best experts on this subject based on the ideXlab platform.
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measurement of Neutrino oscillations with the minos detectors in the numi beam
Physical Review Letters, 2008Co-Authors: P Adamson, C. Andreopoulos, K E Arms, R Armstrong, D J Auty, D S Ayres, B Baller, P D Barnes, G Barr, W L BarrettAbstract:This Letter reports new results from the MINOS experiment based on a two-year exposure to muon Neutrinos from the Fermilab NuMI beam. Our data are consistent with quantum-mechanical oscillations of Neutrino flavor with mass splitting |Δm^2|=(2.43±0.13)×10^-3 eV^2 (68% C.L.) and mixing angle sin^2(2θ)>0.90 (90% C.L.). Our data disfavor two alternative explanations for the disappearance of Neutrinos in flight: namely, Neutrino decays into lighter particles and quantum decoherence of Neutrinos, at the 3.7 and 5.7 standard-deviation levels, respectively.
