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Leptonic CP Violation and its Origin
High Energy Physics - Phenomenology · Submitted 1 Oct 2020
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim In the end, CP violation induced by neutrino masses and leptonic mixing is found to be quite robust, due to the large amount of neutrino flavour transition data collected along three decades.
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The abstract, sentence by sentence
This PhD thesis deals with the current experimental hint for large CP violation in the leptonic sector. We first quantify its global statistical significance, by combining the results from relevant neutrino oscillation experiments. As the hint is indirect, other new physics apart from three massive neutrinos could be present, masking the results as direct leptonic CP violation has not yet been conclusively observed. Thus, we move on to checking the robustness of the hint against the framework in which the experimental data is interpreted; in other words, its physical origin. To that purpose, we confront with data the scenario that is less bounded by other experiments: neutral current Non-Standard Interactions (NSI) among neutrinos and matter. In the end, CP violation induced by neutrino masses and leptonic mixing is found to be quite robust, due to the large amount of neutrino flavour transition data collected along three decades. Nevertheless, the next generation LBL accelerator experiments are aimed at precision measurements that could be more severely affected. Luckily, in the last years the COHERENT experiment has provided independent constraints on NSI. In the final chapter of the thesis, the data from the COHERENT experiment is analysed and integrated into the global analyses from previous chapters. These first results could be greatly improved by increasing the statistics of the signal and/or by performing measurements with different nuclei sensitive to different NSI models. For that, the European Spallation Source is an ideal future facility, whose prospects for bounding NSI are also explored. In summary, this thesis takes a global approach to rigorously assess whether cutting-edge leptonic flavour measurements are pointing towards a new strong violation of a symmetry of Nature.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | This PhD thesis deals with the current experimental hint for large CP violation in the leptonic sector. | background 0.65 | 0.22 | 0.04 | asserted 0.60 |
| s1 | We first quantify its global statistical significance, by combining the results from relevant neutrino oscillation experiments. | method 0.64 | 0.87 | 0.02 | asserted 0.96 |
| s2 | As the hint is indirect, other new physics apart from three massive neutrinos could be present, masking the results as direct leptonic CP violation has not yet been conclusively observed. | background 0.52 | 0.08 | 0.03 | hedged possibility 0.93 |
| s3 | Thus, we move on to checking the robustness of the hint against the framework in which the experimental data is interpreted; in other words, its physical origin. | contribution 0.57 | 0.53 | 0.03 | asserted 0.76 |
| s4 | To that purpose, we confront with data the scenario that is less bounded by other experiments: neutral current Non-Standard Interactions (NSI) among neutrinos and matter. | method 0.79 | 0.74 | 0.02 | asserted 0.81 |
| s5 | In the end, CP violation induced by neutrino masses and leptonic mixing is found to be quite robust, due to the large amount of neutrino flavour transition data collected along three decades. | result 0.97 | 0.89 | 0.75 | asserted 1.00 |
| s6 | Nevertheless, the next generation LBL accelerator experiments are aimed at precision measurements that could be more severely affected. | interpretation 0.40 | 0.09 | 0.04 | hedged possibility 0.87 |
| s7 | Luckily, in the last years the COHERENT experiment has provided independent constraints on NSI. | background 0.80 | 0.10 | 0.02 | asserted 0.99 |
| s8 | In the final chapter of the thesis, the data from the COHERENT experiment is analysed and integrated into the global analyses from previous chapters. | contribution 0.53 | 0.83 | 0.04 | asserted 0.99 |
| s9 | These first results could be greatly improved by increasing the statistics of the signal and/or by performing measurements with different nuclei sensitive to different NSI models. | future work 0.98 | 0.21 | 0.03 | hedged possibility 1.00 |
| s10 | For that, the European Spallation Source is an ideal future facility, whose prospects for bounding NSI are also explored. | future work 0.98 | 0.53 | 0.03 | asserted 0.70 |
| s11 | In summary, this thesis takes a global approach to rigorously assess whether cutting-edge leptonic flavour measurements are pointing towards a new strong violation of a symmetry of Nature. | contribution 0.92 | 0.72 | 0.17 | asserted 0.87 |
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Original abstract
This PhD thesis deals with the current experimental hint for large CP violation in the leptonic sector. We first quantify its global statistical significance, by combining the results from relevant neutrino oscillation experiments. As the hint is indirect, other new physics apart from three massive neutrinos could be present, masking the results as direct leptonic CP violation has not yet been conclusively observed. Thus, we move on to checking the robustness of the hint against the framework in which the experimental data is interpreted; in other words, its physical origin. To that purpose, we confront with data the scenario that is less bounded by other experiments: neutral current Non-Standard Interactions (NSI) among neutrinos and matter. In the end, CP violation induced by neutrino masses and leptonic mixing is found to be quite robust, due to the large amount of neutrino flavour transition data collected along three decades. Nevertheless, the next generation LBL accelerator experiments are aimed at precision measurements that could be more severely affected. Luckily, in the last years the COHERENT experiment has provided independent constraints on NSI. In the final chapter of the thesis, the data from the COHERENT experiment is analysed and integrated into the global analyses from previous chapters. These first results could be greatly improved by increasing the statistics of the signal and/or by performing measurements with different nuclei sensitive to different NSI models. For that, the European Spallation Source is an ideal future facility, whose prospects for bounding NSI are also explored. In summary, this thesis takes a global approach to rigorously assess whether cutting-edge leptonic flavour measurements are pointing towards a new strong violation of a symmetry of Nature.
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How the literature uses it
1 arXiv paper cite this in 1 sentence
Papers citing it
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This result is exactly the same as the previous ones [ref] .
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This updates and extends the analysis in Ref. [ref] where NSI-NC with either up or down quarks were considered.
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In the analysis of solar neutrino data we consider the total rates from the radiochemical experiments Chlorine [ref] , Gallex/GNO [ref] and SAGE [ref] , the results for the four phases of Super-Kamiokande [ref] , the data of the three phases of SNO included in the form of the parametrisation presented in [ref] , and the results of both Phase-I and Phase-II of Borexino [ref] .
Solar neutrino measurements in Super-Kamiokande-I · Data samples analysed · 1.00
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In the analysis of solar neutrino data we consider the total rates from the radiochemical experiments Chlorine [ref] , Gallex/GNO [ref] and SAGE [ref] , the results for the four phases of Super-Kamiokande [ref] , the data of the three phases of SNO included in the form of the parametrisation presented in [ref] , and the results of both Phase-I and Phase-II of Borexino [ref] .
Solar neutrino results in Super-Kamiokande-III · Data samples analysed · 1.00
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In the analysis of solar neutrino data we consider the total rates from the radiochemical experiments Chlorine [ref] , Gallex/GNO [ref] and SAGE [ref] , the results for the four phases of Super-Kamiokande [ref] , the data of the three phases of SNO included in the form of the parametrisation presented in [ref] , and the results of both Phase-I and Phase-II of Borexino [ref] .
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* Overall we find that with the data presented in this section confidence levels are clearly closer to Gaussianity than found in Refs. [ref] , where similar simulations have been performed with less data available.
Updated fit to three neutrino mixing: status of leptonic CP violation · dCP and the mass ordering · 0.99
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* Overall we find that with the data presented in this section confidence levels are clearly closer to Gaussianity than found in Refs. [ref] , where similar simulations have been performed with less data available.
On the determination of the leptonic CP phase · dCP and the mass ordering · 0.99
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Cites as support 26 papers
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Since the original discoveries, the effect has been independently confirmed with large statistical significance, both with natural and artificial neutrino sources [ref] .
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Since the original discoveries, the effect has been independently confirmed with large statistical significance, both with natural and artificial neutrino sources [ref] .
Solar neutrino measurements in Super-Kamiokande-II · Neutrino phenomenology · 0.97
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Since the original discoveries, the effect has been independently confirmed with large statistical significance, both with natural and artificial neutrino sources [ref] .
Solar neutrino measurements in Super-Kamiokande-I · Neutrino phenomenology · 0.97
Cites as background 26 papers
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To unveil these unknowns, particularly CP violation, there is a rich programme of present [ref] and future [ref] long baseline (LBL) accelerator neutrino experiments.
Physics Potential of a Long Baseline Neutrino Oscillation Experiment Using J-PARC Neutrino Beam and Hyper-Kamiokande · Outline of this thesis · 0.81
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To unveil these unknowns, particularly CP violation, there is a rich programme of present [ref] and future [ref] long baseline (LBL) accelerator neutrino experiments.
NOvA Proposal to Build a 30 Kiloton Off-Axis Detector to Study Neutrino Oscillations in the Fermilab NuMI Beamline · Outline of this thesis · 0.81
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To unveil these unknowns, particularly CP violation, there is a rich programme of present [ref] and future [ref] long baseline (LBL) accelerator neutrino experiments.
1106.1238 · Outline of this thesis · 0.81
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