Limits on electron neutrino disappearance from the KARMEN and LSND<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>ν</mml:mi><mml:mi>e</mml:mi></mml:msub></mml:math>-carbon cross section data

Conrad, J. M.; Shaevitz, M. H.

doi:10.1103/physrevd.85.013017

Cited by 62 publications

(51 citation statements)

References 32 publications

(44 reference statements)

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“…This is in principle bounded by similar measurements of the rate of ν e + 12 C → 12 N g.s. + e − [28,30], which are more consistent with expectations [29]. We find that these carbon data are compatible with fits to the RAA and GA data.…”

Section: Discussionsupporting

confidence: 85%

“…+ e − [28] are very mildly discrepant with the cross-section predictions [29] and might also be due to a similar reduction of flux of ν e . This was originally presented as a constraint on the GA parameter space in [30], but the shallowness of the respective ∆χ 2 's and the similarity in the parameter space leads us to consider the possibility of reconciling this data with the RAA and GA data.…”

Section: A the Gallium And Reactor Anomaliesmentioning

confidence: 99%

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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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Section: Discussionsupporting

confidence: 85%

Section: A the Gallium And Reactor Anomaliesmentioning

confidence: 99%

Neutrino phenomenology in a3+1+1framework

2012

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“…The ten textures A, B 1, 2, 3, 4 , C 1, 2 , D 1, 2 , E 1 assume m ee = 0, thus definitely they cannot produce any signal in the 0νββ experiments. With help of the Majorana phases α and γ, the nine textures B 5, 6 , D 3, 4, 5, 6 , E 2, 3 , F with NH spectrum can lead to vanishing Majorana neutrino mass, and the maximum value of m ee in these textures at the leading order is about (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) meV. For IH, m 1, 2 become heavier and it is impossible for the states m 1, 2, 4 to completely cancel out each other, thus we arrive at a nonvanishing lower bound of ∼ 47 meV in the nine textures.…”

Section: 6mentioning

confidence: 99%

“…In addition, cosmological data on cosmological microwave background, large scale structure, and the Hubble constant imply extra light degrees of freedom [9], and light extra neutrinos beyond the three in the SM are convincingly the most natural candidate. All these hints of extra neutrinos, however, are restricted by, e.g., the ICARUS [10] and ν e − 12 C scattering [11] data.…”

Section: Introductionmentioning

confidence: 99%

Majorana neutrino mass matrices with three texture zeros and the sterile neutrino

Zhang

2013

Phys. Rev. D

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As a consequence of the LSND anomaly and other hints of an eV scale sterile neutrino from particle physics and cosmology, the neutrino sector of the standard model of particle physics has to be extended and the smallest extension is the (3+1) model, i.e., three active neutrinos plus one sterile one. In this work we study the neutrino mass matrix M ν with three texture zeros in the (3+1) model, assuming all the neutrino states are of Majorana type. With the mass hierarchy between the active and sterile neutrinos as well as the smallness of the reactor neutrino mixing and active-sterile mixing, the analytical expressions can be greatly simplified. We systematically examine all the 120 texture zeros, via both analytical and numerical analysis, and find that the 100 textures with zeros in the fourth column and row of M ν can hardly be compatible with experiments; whereas, 19 of the other 20 are feasible. We can foresee that the active neutrino masses are required to be around 0.01 eV and the next generation neutrinoless double beta decay experiments are promising to test these textures. Many other phenomenologically meaningful predictions are also obtained. All the CP conserving (3+1) textures with three zeros are excluded by experiments.

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“…The correlated systematics of the two detectors are taken into account and the analysis proceeds as described in Reference [109]. Note that in References [109], 95% limits were shown which do not show closed contours, however there are closed contours at the 90% CL as seen in Figure 5- In the analysis, the rate of expected events for a given mass and mixing model is integrated over the detector volume and compared with the null hypothesis.…”

Section: Electron Flavor Disappearance Karmen/lsnd(xsec) Ve + Vmentioning

confidence: 99%

Sterile Neutrino Searches in MiniBooNE and MicroBooNE

Ignarra

2014

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Tension among recent short baseline neutrino experiments has pointed toward the possible need for the addition of one or more sterile (non-interacting) neutrino states into the existing neutrino oscillation framework. This thesis first presents the motivation for sterile neutrino models by describing the short-baseline anomalies that can be addressed with them. This is followed by a discussion of the phenomenology of these models. The MiniBooNE experiment and results are then described in detail, particularly the most recent antineutrino analysis. This will be followed by a discussion of global fits to world data, including the anomalous data sets. Lastly, future experiments will be addressed, especially focusing on the MicroBooNE experiment and light collection studies. In particular, understanding the degradation source of TPB, designing the TPB-coated plates for MicroBooNE and developing lightguide collection systems will be discussed.We find an excess of events in the MiniBooNE antineutrino mode results consistent with the LSND anomaly, but one that has a different energy dependence than the lowenergy excess reported in neutrino mode. This disagreement creates tension within global fits which include up to three sterile neutrinos. The low-energy excess will be addressed by the MicroBooNE experiment, which is expected to start taking data in early 2015. Tension among existing experiments calls for additional, more decisive future experiments.

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Limits on electron neutrino disappearance from the KARMEN and LSNDνe-carbon cross section data

Cited by 62 publications

References 32 publications

Neutrino phenomenology in a3+1+1framework

Neutrino phenomenology in a3+1+1framework

Majorana neutrino mass matrices with three texture zeros and the sterile neutrino

Sterile Neutrino Searches in MiniBooNE and MicroBooNE

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