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H W Long - One of the best experts on this subject based on the ideXlab platform.
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short baseline Electron Neutrino oscillation length after the troitsk experiment
Physical Review D, 2013Co-Authors: C Giunti, M Laveder, H W LongAbstract:We discuss the implications for short-baseline Electron Neutrino disappearance in the 3 + 1 mixing scheme of the recent Troitsk bounds on the mixing of a Neutrino with mass between 2 and 100 eV. Considering the Troitsk data in combination with the results of short-baseline nu(e) and (nu) over bar (e) disappearance experiments, which include the reactor and Gallium anomalies, we derive a 2 sigma allowed range for the effective Neutrino squared-mass difference between 0.85 and 43 eV(2). The upper bound implies that it is likely that oscillations in distance and/or energy can be observed in radioactive source experiments. It is also favorable for the ICARUS@CERN experiment, in which it is likely that oscillations are not washed out in the near detector. We discuss also the implications for Neutrinoless double-beta decay. DOI: 10.1103/PhysRevD.87.013004
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update of short baseline Electron Neutrino and antiNeutrino disappearance
Physical Review D, 2012Co-Authors: C Giunti, M Laveder, Q Y Liu, H W LongAbstract:We present a complete update of the analysis of ${\ensuremath{\nu}}_{e}$ and ${\overline{\ensuremath{\nu}}}_{e}$ disappearance experiments in terms of Neutrino oscillations in the framework of $3+1$ Neutrino mixing, taking into account the Gallium anomaly, the reactor anomaly, solar Neutrino data, and ${\ensuremath{\nu}}_{e}\mathrm{C}$ scattering data. We discuss the implications of a recent $^{71}\mathrm{Ga}(^{3}\mathrm{He},^{3}\mathrm{H})^{71}\mathrm{Ge}$ measurement which give information on the Neutrino cross section in Gallium experiments. We discuss the solar bound on active-sterile mixing and present our numerical results. We discuss the connection between the results of the fit of Neutrino oscillation data and the heavy Neutrino mass effects in $\ensuremath{\beta}$-decay experiments (considering new Mainz data) and Neutrinoless double-$\ensuremath{\beta}$ decay experiments (considering the recent EXO results).
C Giunti - One of the best experts on this subject based on the ideXlab platform.
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short baseline Electron Neutrino oscillation length after the troitsk experiment
Physical Review D, 2013Co-Authors: C Giunti, M Laveder, H W LongAbstract:We discuss the implications for short-baseline Electron Neutrino disappearance in the 3 + 1 mixing scheme of the recent Troitsk bounds on the mixing of a Neutrino with mass between 2 and 100 eV. Considering the Troitsk data in combination with the results of short-baseline nu(e) and (nu) over bar (e) disappearance experiments, which include the reactor and Gallium anomalies, we derive a 2 sigma allowed range for the effective Neutrino squared-mass difference between 0.85 and 43 eV(2). The upper bound implies that it is likely that oscillations in distance and/or energy can be observed in radioactive source experiments. It is also favorable for the ICARUS@CERN experiment, in which it is likely that oscillations are not washed out in the near detector. We discuss also the implications for Neutrinoless double-beta decay. DOI: 10.1103/PhysRevD.87.013004
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update of short baseline Electron Neutrino and antiNeutrino disappearance
Physical Review D, 2012Co-Authors: C Giunti, M Laveder, Q Y Liu, H W LongAbstract:We present a complete update of the analysis of ${\ensuremath{\nu}}_{e}$ and ${\overline{\ensuremath{\nu}}}_{e}$ disappearance experiments in terms of Neutrino oscillations in the framework of $3+1$ Neutrino mixing, taking into account the Gallium anomaly, the reactor anomaly, solar Neutrino data, and ${\ensuremath{\nu}}_{e}\mathrm{C}$ scattering data. We discuss the implications of a recent $^{71}\mathrm{Ga}(^{3}\mathrm{He},^{3}\mathrm{H})^{71}\mathrm{Ge}$ measurement which give information on the Neutrino cross section in Gallium experiments. We discuss the solar bound on active-sterile mixing and present our numerical results. We discuss the connection between the results of the fit of Neutrino oscillation data and the heavy Neutrino mass effects in $\ensuremath{\beta}$-decay experiments (considering new Mainz data) and Neutrinoless double-$\ensuremath{\beta}$ decay experiments (considering the recent EXO results).
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short baseline Electron Neutrino disappearance tritium beta decay and Neutrinoless double beta decay
Physical Review D, 2010Co-Authors: C Giunti, M LavederAbstract:We consider the interpretation of the MiniBooNE low-energy anomaly and the gallium radioactive source experiments anomaly in terms of short-baseline Electron Neutrino disappearance in the framework of $3+1$ four-Neutrino mixing schemes. The separate fits of MiniBooNE and gallium data are highly compatible, with close best-fit values of the effective oscillation parameters $\ensuremath{\Delta}{m}^{2}$ and ${sin}^{2}2\ensuremath{\vartheta}$. The combined fit gives $\ensuremath{\Delta}{m}^{2}\ensuremath{\gtrsim}0.1\text{ }\text{ }{\mathrm{eV}}^{2}$ and $0.11\ensuremath{\lesssim}{sin}^{2}2\ensuremath{\vartheta}\ensuremath{\lesssim}0.48$ at $2\ensuremath{\sigma}$. We consider also the data of the Bugey and Chooz reactor antiNeutrino oscillation experiments and the limits on the effective Electron antiNeutrino mass in $\ensuremath{\beta}$ decay obtained in the Mainz and Troitsk tritium experiments. The fit of the data of these experiments limits the value of ${sin}^{2}2\ensuremath{\vartheta}$ below 0.10 at $2\ensuremath{\sigma}$. Considering the tension between the Neutrino MiniBooNE and gallium data and the antiNeutrino reactor and tritium data as a statistical fluctuation, we perform a combined fit which gives $\ensuremath{\Delta}{m}^{2}\ensuremath{\simeq}2\text{ }\text{ }\mathrm{eV}$ and $0.01\ensuremath{\lesssim}{sin}^{2}2\ensuremath{\vartheta}\ensuremath{\lesssim}0.13$ at $2\ensuremath{\sigma}$. Assuming a hierarchy of masses ${m}_{1}$, ${m}_{2}$, ${m}_{3}\ensuremath{\ll}{m}_{4}$, the predicted contributions of ${m}_{4}$ to the effective Neutrino masses in $\ensuremath{\beta}$ decay and Neutrinoless double-$\ensuremath{\beta}$ decay are, respectively, between about 0.06 and 0.49 and between about 0.003 and 0.07 eV at $2\ensuremath{\sigma}$. We also consider the possibility of reconciling the tension between the Neutrino MiniBooNE and gallium data and the antiNeutrino reactor and tritium data with different mixings in the Neutrino and antiNeutrino sectors. We find a $2.6\ensuremath{\sigma}$ indication of a mixing angle asymmetry.
M Laveder - One of the best experts on this subject based on the ideXlab platform.
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short baseline Electron Neutrino oscillation length after the troitsk experiment
Physical Review D, 2013Co-Authors: C Giunti, M Laveder, H W LongAbstract:We discuss the implications for short-baseline Electron Neutrino disappearance in the 3 + 1 mixing scheme of the recent Troitsk bounds on the mixing of a Neutrino with mass between 2 and 100 eV. Considering the Troitsk data in combination with the results of short-baseline nu(e) and (nu) over bar (e) disappearance experiments, which include the reactor and Gallium anomalies, we derive a 2 sigma allowed range for the effective Neutrino squared-mass difference between 0.85 and 43 eV(2). The upper bound implies that it is likely that oscillations in distance and/or energy can be observed in radioactive source experiments. It is also favorable for the ICARUS@CERN experiment, in which it is likely that oscillations are not washed out in the near detector. We discuss also the implications for Neutrinoless double-beta decay. DOI: 10.1103/PhysRevD.87.013004
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update of short baseline Electron Neutrino and antiNeutrino disappearance
Physical Review D, 2012Co-Authors: C Giunti, M Laveder, Q Y Liu, H W LongAbstract:We present a complete update of the analysis of ${\ensuremath{\nu}}_{e}$ and ${\overline{\ensuremath{\nu}}}_{e}$ disappearance experiments in terms of Neutrino oscillations in the framework of $3+1$ Neutrino mixing, taking into account the Gallium anomaly, the reactor anomaly, solar Neutrino data, and ${\ensuremath{\nu}}_{e}\mathrm{C}$ scattering data. We discuss the implications of a recent $^{71}\mathrm{Ga}(^{3}\mathrm{He},^{3}\mathrm{H})^{71}\mathrm{Ge}$ measurement which give information on the Neutrino cross section in Gallium experiments. We discuss the solar bound on active-sterile mixing and present our numerical results. We discuss the connection between the results of the fit of Neutrino oscillation data and the heavy Neutrino mass effects in $\ensuremath{\beta}$-decay experiments (considering new Mainz data) and Neutrinoless double-$\ensuremath{\beta}$ decay experiments (considering the recent EXO results).
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short baseline Electron Neutrino disappearance tritium beta decay and Neutrinoless double beta decay
Physical Review D, 2010Co-Authors: C Giunti, M LavederAbstract:We consider the interpretation of the MiniBooNE low-energy anomaly and the gallium radioactive source experiments anomaly in terms of short-baseline Electron Neutrino disappearance in the framework of $3+1$ four-Neutrino mixing schemes. The separate fits of MiniBooNE and gallium data are highly compatible, with close best-fit values of the effective oscillation parameters $\ensuremath{\Delta}{m}^{2}$ and ${sin}^{2}2\ensuremath{\vartheta}$. The combined fit gives $\ensuremath{\Delta}{m}^{2}\ensuremath{\gtrsim}0.1\text{ }\text{ }{\mathrm{eV}}^{2}$ and $0.11\ensuremath{\lesssim}{sin}^{2}2\ensuremath{\vartheta}\ensuremath{\lesssim}0.48$ at $2\ensuremath{\sigma}$. We consider also the data of the Bugey and Chooz reactor antiNeutrino oscillation experiments and the limits on the effective Electron antiNeutrino mass in $\ensuremath{\beta}$ decay obtained in the Mainz and Troitsk tritium experiments. The fit of the data of these experiments limits the value of ${sin}^{2}2\ensuremath{\vartheta}$ below 0.10 at $2\ensuremath{\sigma}$. Considering the tension between the Neutrino MiniBooNE and gallium data and the antiNeutrino reactor and tritium data as a statistical fluctuation, we perform a combined fit which gives $\ensuremath{\Delta}{m}^{2}\ensuremath{\simeq}2\text{ }\text{ }\mathrm{eV}$ and $0.01\ensuremath{\lesssim}{sin}^{2}2\ensuremath{\vartheta}\ensuremath{\lesssim}0.13$ at $2\ensuremath{\sigma}$. Assuming a hierarchy of masses ${m}_{1}$, ${m}_{2}$, ${m}_{3}\ensuremath{\ll}{m}_{4}$, the predicted contributions of ${m}_{4}$ to the effective Neutrino masses in $\ensuremath{\beta}$ decay and Neutrinoless double-$\ensuremath{\beta}$ decay are, respectively, between about 0.06 and 0.49 and between about 0.003 and 0.07 eV at $2\ensuremath{\sigma}$. We also consider the possibility of reconciling the tension between the Neutrino MiniBooNE and gallium data and the antiNeutrino reactor and tritium data with different mixings in the Neutrino and antiNeutrino sectors. We find a $2.6\ensuremath{\sigma}$ indication of a mixing angle asymmetry.
A Ariga - One of the best experts on this subject based on the ideXlab platform.
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Measurement of the charged-current Electron (anti-)Neutrino inclusive cross-sections at the T2K off-axis near detector ND280
JHEP, 2020Co-Authors: K Abe, C. Andreopoulos, S. Aoki, R Akutsu, A Ali, L Anthony, M Antonova, N. Akhlaq, C. Alt, A ArigaAbstract:The Electron (anti-)Neutrino component of the T2K Neutrino beam constitutes the largest background in the measurement of Electron (anti-)Neutrino appearance at the far detector. The Electron Neutrino scattering is measured directly with the T2K off-axis near detector, ND280. The selection of the Electron (anti-)Neutrino events in the plastic scintillator target from both Neutrino and anti-Neutrino mode beams is discussed in this paper. The flux integrated single differential charged-current inclusive Electron (anti-)Neutrino cross-sections, dσ/dp and dσ/d cos(θ), and the total cross-sections in a limited phase-space in momentum and scattering angle (p > 300 MeV/c and θ ≤ 45°) are measured using a binned maximum likelihood fit and compared to the Neutrino Monte Carlo generator predictions, resulting in good agreement.
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search for cp violation in Neutrino and antiNeutrino oscillations by the t2k experiment with 2 2 1021 protons on target
Physical Review Letters, 2018Co-Authors: K Abe, C. Andreopoulos, S. Aoki, R Akutsu, A Ali, J Amey, L Anthony, M Antonova, A ArigaAbstract:The T2K experiment measures muon Neutrino disappearance and Electron Neutrino appearance in accelerator-produced Neutrino and antiNeutrino beams. With an exposure of $14.7(7.6)\times 10^{20}$ protons on target in Neutrino (antiNeutrino) mode, 89 $\nu_e$ candidates and 7 anti-$\nu_e$ candidates were observed while 67.5 and 9.0 are expected for $\delta_{CP}=0$ and normal mass ordering. The obtained $2\sigma$ confidence interval for the $CP$ violating phase, $\delta_{CP}$, does not include the $CP$-conserving cases ($\delta_{CP}=0,\pi$). The best-fit values of other parameters are $\sin^2\theta_{23} = 0.526^{+0.032}_{-0.036}$ and $\Delta m^2_{32}=2.463\pm0.065\times10^{-3} \mathrm{eV}^2/c^4$.
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final results of the search for νμ νe oscillations with the opera detector in the cngs beam
Journal of High Energy Physics, 2018Co-Authors: N. Agafonova, A Ariga, S. Aoki, A. Aleksandrov, A. Anokhina, T. Ariga, A. Bertolin, C. Bozza, R. Brugnera, A BuonauraAbstract:The OPERA experiment has discovered the tau Neutrino appearance in the CNGS muon Neutrino beam, in agreement with the 3 Neutrino flavour oscillation hypothesis. The OPERA Neutrino interaction target, made of Emulsion Cloud Chambers, was particularly efficient in the reconstruction of electromagnetic showers. Moreover, thanks to the very high granularity of the emulsion films, showers induced by Electrons can be distinguished from those induced by π$^{0}$s, thus allowing the detection of charged current interactions of Electron Neutrinos. In this paper the results of the search for Electron Neutrino events using the full dataset are reported. An improved method for the Electron Neutrino energy estimation is exploited. Data are compatible with the 3 Neutrino flavour mixing model expectations and are used to set limits on the oscillation parameters of the 3+1 Neutrino mixing model, in which an additional mass eigenstate m$_{4}$ is introduced. At high Δm$_{41}^{2}$ (≳0.1 eV$^{2}$), an upper limit on sin$^{2}$ 2θ$_{μe}$ is set to 0.021 at 90% C.L. and Δm$_{41}^{2}$ ≳ 4 × 10$^{− 3}$ eV$^{2}$ is excluded for maximal mixing in appearance mode.
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Final results of the search for ν μ → ν e oscillations with the OPERA detector in the CNGS beam
SpringerOpen, 2018Co-Authors: The Opera Collaboration, A Ariga, N. Agafonova, A. Aleksandrov, A. Anokhina, S. Aoki, T. Ariga, A. Bertolin, C. Bozza, R. BrugneraAbstract:Abstract The OPERA experiment has discovered the tau Neutrino appearance in the CNGS muon Neutrino beam, in agreement with the 3 Neutrino flavour oscillation hypothesis. The OPERA Neutrino interaction target, made of Emulsion Cloud Chambers, was particularly efficient in the reconstruction of electromagnetic showers. Moreover, thanks to the very high granularity of the emulsion films, showers induced by Electrons can be distinguished from those induced by π 0s, thus allowing the detection of charged current interactions of Electron Neutrinos. In this paper the results of the search for Electron Neutrino events using the full dataset are reported. An improved method for the Electron Neutrino energy estimation is exploited. Data are compatible with the 3 Neutrino flavour mixing model expectations and are used to set limits on the oscillation parameters of the 3+1 Neutrino mixing model, in which an additional mass eigenstate m 4 is introduced. At high Δm 412 (≳0.1 eV2), an upper limit on sin2 2θ μe is set to 0.021 at 90% C.L. and Δm 412 ≳ 4 × 10− 3 eV2 is excluded for maximal mixing in appearance mode
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measurement of the inclusive Electron Neutrino charged current cross section on carbon with the t2k near detector
Physical Review Letters, 2014Co-Authors: K Abe, Hirokazu Aihara, T. Akiri, C. Andreopoulos, S. Assylbekov, D. Autiero, J Adam, A Ariga, S. Aoki, Martina BarbiAbstract:The T2K off-axis near detector ND280 is used to make the first differential cross-section measurements of Electron Neutrino charged current interactions at energies ∼1 GeV as a function of Electron momentum, Electron scattering angle, and four-momentum transfer of the interaction. The total flux-averaged νe charged current cross section on carbon is measured to be ⟨σ⟩ϕ=1.11±0.10(stat)±0.18(syst)×10−38 cm2/nucleon. The differential and total cross-section measurements agree with the predictions of two leading Neutrino interaction generators, NEUT and GENIE. The NEUT prediction is 1.23×10−38 cm2/nucleon and the GENIE prediction is 1.08×10−38 cm2/nucleon. The total νe charged current cross-section result is also in agreement with data from the Gargamelle experiment.
She-sheng Xue - One of the best experts on this subject based on the ideXlab platform.
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Hierarchy spectrum of SM fermions: from top quark to Electron Neutrino
Journal of High Energy Physics, 2016Co-Authors: She-sheng XueAbstract:In the SM gauge symmetries and fermion content of Neutrinos, charged leptons and quarks, we study the effective four-fermion operators of Einstein-Cartan type and their contributions to the Schwinger-Dyson equations of fermion self-energy functions. The study is motivated by the speculation that these four-fermion operators are probably originated due to the quantum gravity, which provides the natural regularization for chiral-symmetric gauge field theories. In the chiral-gauge symmetry breaking phase, as to achieve the energetically favorable ground state, only the top-quark mass is generated via the spontaneous symmetry breaking, and other fermion masses are generated via the explicit symmetry breaking induced by the top-quark mass, four-fermion interactions and fermion-flavor mixing matrices. A phase transition from the symmetry breaking phase to the chiral-gauge symmetric phase at TeV scale occurs and the drastically fine-tuning problem can be resolved. In the infrared fixed-point domain of the four-fermion coupling for the SM at low energies, we qualitatively obtain the hierarchy patterns of the SM fermion Dirac masses, Yukawa couplings and family-flavor mixing matrices with three additional right-handed Neutrinos ν _ R ^ f . Large Majorana masses and lepton-number symmetry breaking are originated by the four-fermion interactions among ν _ R ^ f and their left-handed conjugated fields ν _ R ^ fc . Light masses of gauged Majorana Neutrinos in the normal hierarchy (10^−5 − 10^−2 eV) are obtained consistently with Neutrino oscillations. We present some discussions on the composite Higgs phenomenology and forward-backward asymmetry of t t ¯ $$ t\overline{t} $$ -production, as well as remarks on the candidates of light and heavy dark matter particles (fermions, scalar and pseudoscalar bosons).
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hierarchy spectrum of sm fermions from top quark to Electron Neutrino
arXiv: High Energy Physics - Phenomenology, 2016Co-Authors: She-sheng XueAbstract:In the SM gauge symmetries and fermion content of Neutrinos, charged leptons and quarks, we study the effective four-fermion operators of Einstein-Cartan type and their contributions to the Schwinger-Dyson equations of fermion self-energy functions. The study is motivated by the speculation that these four-fermion operators are probably originated due to the quantum gravity that provides the natural regularization for chiral-symmetric gauge field theories. In the chiral-gauge symmetry breaking phase, as to achieve the energetically favorable ground state, only the top-quark mass is generated via the spontaneous symmetry breaking, and other fermion masses are generated via the explicit symmetry breaking induced by the top-quark mass, four-fermion interactions and fermion-flavor mixing matrices. A phase transition from the symmetry breaking phase to the chiral-gauge symmetric phase at TeV scale occurs and the drastically fine-tuning problem can be resolved. In the infrared fixed-point domain of the four-fermion coupling for the SM at low energies, we qualitatively obtain the hierarchy patterns of the SM fermion Dirac masses, Yukawa couplings and family-flavor mixing matrices with three additional right-handed Neutrinos $\nu^f_R$. Large Majorana masses and lepton-symmetry breaking are originated by the four-fermion interactions among $\nu^f_R$ and their left-handed conjugated fields $\nu^{fc}_R$. Light masses of gauged Majorana Neutrinos in the normal hierarchy ($10^{-5}-10^{-2}$ eV) are obtained consistently with Neutrino oscillations. We present some discussions on the composite Higgs phenomenology and forward-backward asymmetry of $t\bar t$-production, as well as remarks on the candidates of light and heavy dark matter particles (fermions, scalar and pseudoscalar bosons).