Limits on neutrino oscillations from the CHOOZ experiment

Apollonio, M.; Baldini, A.; Bemporad, C.; Caffau, E.; Cei, F.; Déclais, Y.; Kerret, H. de; Dieterle, B.; Etenko, A.; George, Jimin; Giannini, G.; Grassi, M.; Kozlov, Yu. V.; Kropp, W. R.; Kryn, D.; Laiman, M.; Lane, C.; Lefièvre, B.; Machulin, I.; Martemyanov, A.; Martemyanov, V. P.; Mikaelyan, L.A.; Nicoló, D.; Obolensky, M.; Pazzi, R.; Pieri, G.; Price, L. R.; Riley, S.; Reeder, R. A.; Sabelnikov, A.; Santin, G.; Skorokhvatov, M.; Sobel, H. W.; Steele, J.; Steinberg, R.; Sukhotin, S.; Tomshaw, S.; Véron, D.; Vyrodov, V.

doi:10.1016/s0370-2693(99)01072-2

Cited by 1,248 publications

(480 citation statements)

References 5 publications

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“…In the inverse hierarchical scheme the resonance requires |U e3 | ≥ |U e2 |. The CHOOZ experiment [34] gives unfortunately only a limit on |U e3 | (in the inverse hierarchical scheme on |U e1 |), depending on the atmospheric mass scale, it reads at 90 % C. L.…”

Section: Formalismmentioning

confidence: 99%

Cancellations in neutrinoless double beta decay and the neutrino mass matrix

Rodejohann

2001

Nuclear Physics B

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In a degenerate scheme with mass m 0 a complete analysis of the allowed range of the effective electron neutrino Majorana mass m is performed. Special attention is paid to effects of cancellations caused either by intrinsic CP parities of the eigenstates (CP invariance) or by complex mixing matrix elements (CP violation). We investigate all possibilities and give in each case constraints on the phases, the relative CP parities or the neutrino mass scale. A solar mixing angle sin 2 2θ smaller than 0.7 jeopardizes the degenerate mass scheme. A key value of m /m 0 is identified, which is independent on the solar solution and would rule out certain schemes. Also it would answer the question regarding the presence of CP violation. Even if a total neutrino mass scale and an effective mass is measured, the value of the phases or parities is not fixed, unless in some special cases. The resulting uncertainty in the other mass matrix elements is at least of the same order than the one stemming from nuclear matrix elements calculations.

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Section: Formalismmentioning

confidence: 99%

Cancellations in neutrinoless double beta decay and the neutrino mass matrix

Rodejohann

2001

Nuclear Physics B

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“…In the "Before" case, we use all the solar neutrino data (see refs. [9,10,11,12,13,14,15]) that were published or had appeared publicly before April 20, 2002, the date that the SNO NC and day-night asymmetry were first published. In the "After" case, we include in addition measurements reported in the two recent papers [1,2] by the Sudbury Neutrino Observatory (SNO) collaboration.…”

Section: Introductionmentioning

confidence: 99%

Before and After: How has the SNO NC measurement changed things?

Bahcall¹,

González-García²,

Peña-Garay³

2002

J. High Energy Phys.

126

121

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We present "Before and After" global oscillation solutions, as well as predicted "Before and After" values and ranges for ten future solar neutrino observables (for BOREXINO, KamLAND, SNO, and a generic p − p neutrino detector). The "Before" case includes all solar neutrino data (and some theoretical improvements) available prior to April 20, 2002 and the "After" case includes, in addition, the new SNO data on the CC, NC, and day-night asymmetry. We have performed global analyses using the full SNO day-night energy spectrum and, alternatively, using just the SNO NC and CC rates and the day-night asymmetry. The LMA solution is the only currently allowed MSW oscillation solution at ∼ 99% CL. The LOW solution is allowed only at more than 2.5σ, SMA is now excluded at 3.7σ or 4.7σ depending upon analysis strategy, and pure sterile oscillations are excluded at more than 4.7σ. Small mixing angles are "out" (pure sterile is "way out"); MSW with large mixing angles is definitely "in." Vacuum oscillations are allowed at 3σ, but not at 2σ. Precise maximal mixing is excluded at 3.2σ for MSW solutions and at more than 2.8σ for vacuum solutions. Most of the predicted values for future observables for the BOREXINO, KamLAND, and future SNO measurements are changed only by minor amounts by the inclusion of the recent SNO data. In order to test the robustness of the allowed neutrino oscillation regions that are inferred from the measurements and the predicted values for future solar neutrino observables, we have carried out calculations using a variety of strategies for analyzing the SNO and other experimental data.

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“…We include all the available solar neutrino and reactor oscillation data [1,2,3,4,5,6,7]. We also present "Before and After" comparisons of the globally allowed solutions using both the previous(1998) standard value of S 17 (0),the low energy cross section factor for the production of 8 B, and a precise new measurement [8] for this important quantity.…”

Section: Introductionmentioning

confidence: 99%

Robust signatures of solar neutrino oscillation solutions

Bahcall

González-García

Peña-Garay

2002

J. High Energy Phys.

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With the goal of identifying signatures that select specific neutrino oscillation parameters, we test the robustness of global oscillation solutions that fit all the available solar and reactor experimental data. We use three global analysis strategies previously applied by different authors and also determine the sensitivity of the oscillation solutions to the critical nuclear fusion cross section, S 17 (0), for the production of 8 B. Our standard results make use of the precise new measurement of S 17 (0) by Junghans et al. The globally favored solutions are, in order of goodness of fit: LMA(the only solution at 2σ), LOW, and VAC. The NC to CC ratio for SNO is predicted by the standard global analysis to be 3.45 +0.70 −0.54 (1σ) which is separated from the no-oscillation value of 1.0 by much more than the expected experimental error. The predicted range of the day-night difference in CC rates is 8.3 +5.0 −5.6 (1σ)%. A measurement by SNO of either a NC to CC ratio > 3.3 or a day-night difference > 10%, would favor a small region of the currently allowed LMA neutrino parameter space. The global oscillation solution predicts a 7 Be neutrino-electron scattering rate in BOREXINO and KamLAND in the range 0.65 +0.04 −0.03 (1σ) of the BP00 standard solar model rate, a prediction which can be used to test both the solar model and the neutrino oscillation theory. Only the LOW solution predicts a large day-night effect(≤ 42%, 3σ) in BOREXINO and KamLAND. For the reactor KamLAND experiment, the LMA solution predicts a charged current rate relative to the standard model of 0.44 +0.22 −0.07 (1σ), E threshold = 1.22 MeV. We have also evaluated the effects of including preliminary Super-Kamiokande data for 1496 days of observations.

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Limits on neutrino oscillations from the CHOOZ experiment

Cited by 1,248 publications

References 5 publications

Cancellations in neutrinoless double beta decay and the neutrino mass matrix

Cancellations in neutrinoless double beta decay and the neutrino mass matrix

Before and After: How has the SNO NC measurement changed things?

Robust signatures of solar neutrino oscillation solutions

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