Unitarity of the leptonic mixing matrix

Antusch, Stefan; Biggio, Carla; Fernández‐Martínez, E.; Gavela, M.B.; López‐Pavón, Jacobo

doi:10.1088/1126-6708/2006/10/084

Cited by 466 publications

(742 citation statements)

References 88 publications

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“…The sensitivity to |η eτ | from the |η eτ | 2 term is also present at zero distance and already studied in Ref. [7], where a similar bound was obtained. We have checked that 0 2.…”

Section: The ν E → ν τ Channelsupporting

confidence: 78%

“…The latter is also present at zero distance and its effects were already considered in Ref. [7], obtaining a bound of similar magnitude. The sensitivity to |η µτ | peaks around |η µτ | ≃ 4 · 10 −4 for δ µτ ≃ ±90 • , where sin δ µτ is maximum.…”

Section: Thesupporting

confidence: 59%

“…[7] it was shown that matter effects are also modified in a very definite way in the presence of a non-unitarity mixing matrix. These new matter effects are not independent from the production/detection effects, contrary to the customary assumption in studies of non-standard neutrino interactions.…”

Section: Non-unitarity Vs Non-standard Interactionsmentioning

confidence: 99%

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CP-violation from non-unitary leptonic mixing

et al. 2007

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A low-energy non-unitary leptonic mixing matrix is a generic effect of a large class of theories accounting for neutrino masses. It is shown how the extra CPodd phases of a general non-unitary matrix allow for sizeable CP-asymmetries in channels other than those dominant in the standard unitary case. The ν µ → ν τ channel turns out to be an excellent tool to further constrain moduli and phases. Furthermore, we clarify the relationship between our approach and the so-called "non-standard neutrino interactions" schemes: the sensitivities explored here apply as well to such constructions.

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“…The sensitivity to |η eτ | from the |η eτ | 2 term is also present at zero distance and already studied in Ref. [7], where a similar bound was obtained. We have checked that 0 2.…”

Section: The ν E → ν τ Channelsupporting

confidence: 78%

Section: Thesupporting

confidence: 59%

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CP-violation from non-unitary leptonic mixing

et al. 2007

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“…This indicates that we have normalized our states incorrectly. However, this is cancelled by an inverse change in the production and detection cross-sections in the types of experiments considered here [57], so we may use the formulae as if the probabilities were unitary.…”

Section: Appendix B: Oscillation Formalismmentioning

confidence: 99%

Neutrino phenomenology in a3+1+1framework

2012

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Evidence continues to grow in the MiniBooNE (MB) antineutrino mode supporting a low-energy excess compatible with the MB neutrino mode and possibly also confirming the results of the LSND experiment. At least one sterile neutrino is required to explain the anomalies consistent with the observations of other experiments. At the same time, there is a strong tension between the positive signals of LSND and MB and the null results of νe and νµ disappearance experiments. We explore a scenario, first proposed in [1], where the presence of an additional heavy sterile neutrino (with mass well above an eV) can alleviate tension between LSND, MB and the null results of disappearance experiments. We compare and contrast this 3+1+1 scenario with the more standard 3+1 scenario and carry out global fits to all oscillation data including new 2011 MBν data. We find that the tension can be somewhat alleviated and that a phenomenologically viable window for the heavy neutrino, consistent with rare decays and BBN constraints, can be found if the fifth neutrino has a mass of order 0.3 − 10 GeV. We also find, however, that the 2011 MBν data exacerbates the tension with null experiments in both the 3+1 and 3+1+1 models when the lowest energy bins are included, resulting in little improvement in the global fit. We also discuss the implications of an additional neutrino for the reactor and gallium anomalies, and show that an oscillation explanation of the anomalies is disfavored by cosmological considerations, direct searches, and precision electroweak tests.2

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“…Such a modification of the SM charged-current interactions would affect lepton universality tests, the measurement of G F from muon decay compared to other measurements, rare lepton decays and the invisible width of the Z, and strong constraints can be derived on the allowed size of η [163,183,[190][191][192]: η ee < 2.0 × 10 −3 , η eµ < 5.9 × 10 −5 , η eτ < 1.6 × 10 −3 , η µµ < 8.2 × 10 −4 , η µτ < 1.0 × 10 −3 and η τ τ < 2.6 × 10 −3 , at the 90 % CL. Up to order η effects, the matrix U can be identified with the PMNS matrix as extracted from experimental data without taking non-unitarity into account.…”

Section: Non-unitarity Of the Leptonic Mixing Matrixmentioning

confidence: 99%