EURONU WP6 2009 yearly report: Update of the physics potential of Nufact, superbeams and betabeams

Bernabéu, J.; Blennow, Mattias; Coloma, Pilar; Donini, A.; Espinoza, C.; Fernández‐Martínez, E.; Hernández, P.; Longhin, A.; López‐Pavón, Jacobo; Mezzetto, M.; Ota, Toshihiko; Schwetz-Mangold, Thomas; Winter, Walter

doi:10.48550/arxiv.1005.3146

Cited by 16 publications

(26 citation statements)

References 73 publications

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“…The disappearance of electron neutrinos can be investigated with high accuracy in future near-detector betabeam [110] and neutrino factory [73,111] experiments in which the neutrino fluxes will be known with high precision.…”

Section: Discussionmentioning

confidence: 99%

Short-baseline electron neutrino disappearance, tritium beta decay, and neutrinoless double-beta decay

Giunti

Laveder

2010

Phys. Rev. D

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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 Delta m(2) and sin(2)upsilon. The combined fit gives Delta m(2) greater than or similar to 0.1 eV(2) and 0.11 less than or similar to sin(2)2 upsilon less than or similar to 0.48 at 2 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 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 upsilon below 0.10 at 2 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 Delta m(2) similar or equal to 2 eV and 0.01 less than or similar to sin(2)2 upsilon less than or similar to 0.13 at 2 sigma. Assuming a hierarchy of masses m1, m2, m3 << m4, the predicted contributions of m4 to the effective neutrino masses in beta decay and neutrinoless double-beta decay are, respectively, between about 0.06 and 0.49 and between about 0.003 and 0.07 eV at 2 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 sigma indication of a mixing angle asymmetry

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Section: Discussionmentioning

confidence: 99%

Short-baseline electron neutrino disappearance, tritium beta decay, and neutrinoless double-beta decay

Giunti

Laveder

2010

Phys. Rev. D

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“…Eq. (1) shows that the evolution of |U e3 | is proportional to m 3 . Moreover at 1-loop, one has ṁi ∝ m i (i = 1, 2, 3) and thus |U e3 |(µ) = m 3 (µ) = 0 is a fixed point of RG evolution: these quantities remain zero throughout the RG evolution.…”

mentioning

confidence: 93%

“…Two more phases ϕ 1,2 are needed if neutrinos are Majorana particles, which is the case in basically all extensions of the Standard Model, and also from an effective field theory point of view. The two mixing angles θ 12 and θ 23 as well as the mass squared difference ∆m 2 ≡ m 2 2 − m 2 1 and the magnitude of ∆m 2 A ≡ m 2 3 − m 2 2 have been determined with high accuracy, and further improvement is foreseen with a variety of experimental approaches [1]. However, of particular interest is the parameter |U e3 | = sin θ 13 , which describes the electron neutrino content in the heaviest (lightest) neutrino masseigenstate, if the normal (inverted) mass ordering is realized, i.e.…”

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confidence: 99%

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Lower bounds on the smallest lepton mixing angle

2011

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We give minimal values for the smallest lepton mixing parameter jU e3 j, applying 2-loop renormalization group equations in an effective theory approach. This is relevant in scenarios that predict an inverted neutrino mass spectrum with the smallest mass and jU e3 j being zero at tree level, a situation known to be preserved at 1-loop order. At 2-loop, jU e3 j is generated at a level of 10 À12 -10 À14 . Such small values are of interest in supernova physics. Corresponding limits for the normal mass ordering are several orders of magnitude larger. Our results show that jU e3 j can in general be expected to be nonzero.

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“…For the investigation of the CPT asymmetry, the ideal experiments are those which can measure the disappearance of both electron neutrinos and antineutrinos, with sources which emit well-known neutrino and antineutrino fluxes and detection processes with well-known cross sec-tions. Experiments of this type are near-detector betabeam [53] and neutrino factory [46,54] experiments, which are under study but may require a long time to be realized. In a shorter time it may be possible to perform dedicated experiments with intense artificial radioactive sources of electron neutrinos and antineutrinos placed inside or close to neutrino elastic scattering detectors with a low energy threshold, as Borexino [55] or a low-threshold liquid Argon TPC [56].…”

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confidence: 99%

Hint of CPT Violation in Short-Baseline Electron Neutrino Disappearance

Giunti

Laveder

2011

J. Phys.: Conf. Ser.

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We analyzed the electron neutrino data of the Gallium radioactive source experiments and the electron antineutrino data of the reactor Bugey and Chooz experiments in terms of neutrino oscillations allowing for a CPT-violating difference of the squared-masses and mixings of neutrinos and antineutrinos. We found that the discrepancy between the disappearance of electron neutrinos indicated by the data of the Gallium radioactive source experiments and the limits on the disappearance of electron antineutrinos given by the data of reactor experiments reveal a positive CPT-violating asymmetry of the effective neutrino and antineutrino mixing angles (with a statistical significance of about 3.5σ), whereas the squared-mass asymmetry is practically not bounded. [4][5][6][7] collaboration for testing the respective Gallium solar neutrino detectors revealed a disappearance of electron neutrinos with energy E of the order of 1 MeV at a distance L of the order of 1 m. Since the ratio L/E is of the order of 10 eV −2 , the disappearance could be due to short-baseline oscillations (see Ref. [8]) generated by a squared-mass difference ∆m 2 0.1eV 2 [9-17] and a large effective mixing angle ϑ, such that sin 2 2ϑ 0. The radioactive source experiments performed by the GALLEX [1-3] and SAGE

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EURONU WP6 2009 yearly report: Update of the physics potential of Nufact, superbeams and betabeams

Cited by 16 publications

References 73 publications

Short-baseline electron neutrino disappearance, tritium beta decay, and neutrinoless double-beta decay

Short-baseline electron neutrino disappearance, tritium beta decay, and neutrinoless double-beta decay

Lower bounds on the smallest lepton mixing angle

Hint of CPT Violation in Short-Baseline Electron Neutrino Disappearance

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