Skip navigation.

v1.0: Three-neutrino fit based on data available in June 2012


If you are using these results please refer to JHEP 12 (2012) 123 [arXiv:1209.3023] as well as NuFIT 1.0 (2012), www.nu-fit.org.


Parameter ranges

image
pdf
Three-flavour oscillation parameters from our fit to global data as of June 2012. For "Free Fluxes + RSBL" reactor fluxes have been left free in the fit and short baseline reactor data (RSBL) with L shorter than ~100 m have been included; for "Huber Fluxes, no RSBL" the flux prediction from arXiv:1106.0687 has been adopted and RSBL data have not been used in the fit. Numbers in brackets correspond to local minima.


Leptonic mixing matrix

image
pdf
3σ CL ranges of the magnitude of the elements of the three-flavour leptonic mixing matrix under the assumption of the matrix U being unitary. The ranges in the different entries of the matrix are correlated due to the fact that, in general, the result of a given experiment restricts a combination of several entries of the matrix, as well as to the constraints imposed by unitarity. As a consequence choosing a specific value for one element further restricts the range of the others.


One-dimensional χ2 projections

image
pdf jpg
Global 3ν oscillation analysis. The red (blue) curves are for Normal (Inverted) Ordering. Results for different assumptions concerning the analysis of data from reactor experiments are shown: for solid curves the normalization of reactor fluxes is left free and data from short-baseline (less than 100 m) reactor experiments are included. For dashed curves short-baseline data are not included but reactor fluxes as predicted in arXiv:1106.0687 are assumed. Note that as atmospheric mass-squared splitting we use Δm231 for NO and Δm232 for IO.


Two-dimensional allowed regions

image
pdf jpg
Global 3ν oscillation analysis. Each panel shows the two-dimensional projection of the allowed six-dimensional region after marginalization with respect to the undisplayed parameters. The different contours correspond to the two-dimensional allowed regions at 1σ, 90%, 2σ, 99%, 3σ CL (2 dof). Results for different assumptions concerning the analysis of data from reactor experiments are shown: full regions correspond to an analysis with the normalization of reactor fluxes left free and data from short-baseline (less than 100 m) reactor experiments are included. For void regions short-baseline reactor data are not included but reactor fluxes as predicted in arXiv:1106.0687 are assumed. Note that as atmospheric mass-squared splitting we use Δm231 for NO and Δm232 for IO.


Contributions to the determination of θ13

image
pdf jpg
Dependence of Δχ2 on θ13 for the different data samples and assumptions quoted in each panel. In the right panel we show the corresponding 1σ ranges.


Reactor flux dependence

image
pdf jpg
Δχ2 as a function of θ13 for the different reactor experiments and different assumptions on the fluxes as labeled in the figure. In this figure we fix Δm231 = 2.47×10-3 eV2. In the lower panels we show the contours in the plane of θ13 and of the flux normalization fflux. Full regions (lines) correspond to analysis with (without) including the RSBL experiments.


Δm231 determination with reactors

image
pdf jpg
3σ allowed regions in the plane of |Δm231| and θ13 for different combinations of the reactor experiments. The region labeled "ALL REACTORS" does not include KamLAND.


LBL-reactor complementarity

image
pdf jpg
Left: Preferred regions in the (θ13, δCP) plane. The contour curves correspond to beams T2K + MINOS appearance data, where θ23 is fixed to the two degenerate solution in the 1st (red) and 2nd (blue) octant. The gray region corresponds to the θ13 determination from the reactors Double Chooz, Daya Bay, and Reno. Upper (lower) panels are for NO (IO). Right: χ2LBLCP) for beams (dashed) and beams+reactors (solid) with the same color coding as in the left panels. Upper (lower) panels are for NO (IO).


Role of atmospheric neutrinos

image
pdf jpg
Δχ2 as a function of θ23 and δCP for three different analysis assumptions on the atmospheric data included as labeled in the figure. Upper (lower) panels correspond to Normal (Inverted) ordering.


Correlation between δCP and other parameters

image
pdf jpg
Global 3ν oscillation analysis. Each panel shows the two-dimensional projection of the allowed six-dimensional region after marginalization with respect to the undisplayed parameters. The different contours correspond to the two-dimensional allowed regions at 1σ, 90%, 2σ, 99%, 3σ CL (2 dof). Results for different assumptions concerning the analysis of data from reactor experiments are shown: full regions correspond to an analysis with the normalization of reactor fluxes left free and data from short-baseline (less than 100 m) reactor experiments are included. For void regions short-baseline reactor data are not included but reactor fluxes as predicted in arXiv:1106.0687 are assumed. Upper (lower) panels are for NO (IO).