# Difference between revisions of "NOvA results"

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− | =Analysis 2019= | + | =[https://journals.aps.org/prl/pdf/10.1103/PhysRevLett.123.151803 Analysis 2019]= |

The best-fit parameters of neutrino oscillation for each choice of <math> \theta_{23} </math> octant and hierarchy. | The best-fit parameters of neutrino oscillation for each choice of <math> \theta_{23} </math> octant and hierarchy. | ||

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</table> | </table> | ||

− | =Analysis 2017= | + | =[https://journals.aps.org/prd/pdf/10.1103/PhysRevD.98.032012 Analysis 2017]= |

+ | |||

+ | The results utilize significant improvements in both the simulations and analysis of the data. A joint fit to the data for <math> \nu_{\mu} </math> disappearance and <math> \nu_{e} </math> appearance gives the best-fit point as normal mass hierarchy, | ||

+ | |||

+ | <math> \Delta m^{2}_{32} = 2.44 \times 10^{-3} eV^{2}/c^{4} </math>, | ||

+ | |||

+ | <math> \sin^{2} \theta_{23} = 0.56 </math>, | ||

+ | |||

+ | <math> \delta_{CP} = 1.21 \pi </math>. | ||

+ | |||

+ | The '''68.3%''' confidence intervals in the '''normal''' mass hierarchy are | ||

+ | |||

+ | <math> \Delta m^{2}_{32} \in [2.37, 2.52] \times 10^{-3} eV^{2}/c^{4} </math>, | ||

+ | |||

+ | <math> \sin^{2} \theta_{23} \in [0.43, 0.51] \cup [0.52, 0.60] </math>, | ||

+ | |||

+ | <math> \delta_{CP} \in [0, 0.12\pi] \cup [0.91\pi, 2\pi] </math>. | ||

+ | |||

+ | The '''inverted''' mass hierarchy is '''disfavored''' at the '''95%''' confidence level for all | ||

+ | choices of the other oscillation parameters. | ||

=Second Analysis (2016)= | =Second Analysis (2016)= | ||

The results of the second analysis were published in 2017. This analysis used an exposure equivalent to <math> 6.05 \times 10^{20} POT </math> from the Fermilab NuMI beam. | The results of the second analysis were published in 2017. This analysis used an exposure equivalent to <math> 6.05 \times 10^{20} POT </math> from the Fermilab NuMI beam. | ||

− | ==Muon neutino disappearance results== | + | ==[https://arxiv.org/pdf/1701.05891.pdf Muon neutino disappearance results]== |

The best fit in the '''normal hierarchy''' gives: | The best fit in the '''normal hierarchy''' gives: | ||

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Maximal mixing, where <math> sin^2 \theta_{23} = 0.5 </math>, was disfavored at <math> 2.6 \sigma</math>. | Maximal mixing, where <math> sin^2 \theta_{23} = 0.5 </math>, was disfavored at <math> 2.6 \sigma</math>. | ||

− | ==Electron neutrino appearance results== | + | ==[https://arxiv.org/pdf/1703.03328.pdf Electron neutrino appearance results]== |

<math> 33 \ \nu_{e} </math> candidates were observed with a background of <math> 8.2 \pm 0.8 \ (syst.) </math>. | <math> 33 \ \nu_{e} </math> candidates were observed with a background of <math> 8.2 \pm 0.8 \ (syst.) </math>. | ||

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− | ==Sterile neutrinos | + | ==[https://arxiv.org/pdf/1706.04592.pdf Sterile neutrinos]== |

+ | Sterile analysis used data collected from February 2014 to May 2016. | ||

+ | |||

+ | With an exposure of <math> 6.05 \times 10^{20} </math> POT-equivalent, '''95 NC-like events''' were observe in the FD, compared with an expectation of <math> 83.5 \pm 9.7(stat.) \pm 9.4(syst.) </math>. This result is consistent with three-flavor mixing within '''1.03 σ'''. | ||

+ | No evidence for depletion of NC events is observed in the FD at a distance of 810 km from the neutrino source and NOvA sees no evidence for active-sterile neutrino mixing. | ||

+ | NOvA set limits of <math> \theta_{24} < 20.8^{\circ} </math> and <math> \theta_{34} < 31.2^{\circ} </math> in a '''3+1 model''' scenario. | ||

=First Analysis (2015)= | =First Analysis (2015)= | ||

The results of the first analysis were published in 2016. This analysis used a 14 kton-equivalent exposure of <math> 2.74 \times 10^{20} POT </math> from the Fermilab NuMI beam. | The results of the first analysis were published in 2016. This analysis used a 14 kton-equivalent exposure of <math> 2.74 \times 10^{20} POT </math> from the Fermilab NuMI beam. | ||

− | ==Muon-neutrino disappearance results== | + | ==[https://arxiv.org/pdf/1601.05037.pdf Muon-neutrino disappearance results]== |

Assuming the '''normal hierarchy''', the measurements have a next view: | Assuming the '''normal hierarchy''', the measurements have a next view: | ||

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− | ==Electron neutrino appearance results== | + | ==[https://arxiv.org/pdf/1601.05022.pdf Electron neutrino appearance results]== |

NOvA had observed <math> 6 \ \nu_{e} </math>-like events in the FD, with a background prediction of <math> 0.99 \pm 0.11 \ (syst.) </math> | NOvA had observed <math> 6 \ \nu_{e} </math>-like events in the FD, with a background prediction of <math> 0.99 \pm 0.11 \ (syst.) </math> | ||

The range of <math> 0.1 \pi < \delta_{CP} < 0.5\pi </math> in the '''IH''' is disfavored at the 90% C.L. The range of <math> 0.25 \pi < \delta_{CP} < 0.95 \pi </math> in the '''NH''' is disfavored at the 90% C.L. | The range of <math> 0.1 \pi < \delta_{CP} < 0.5\pi </math> in the '''IH''' is disfavored at the 90% C.L. The range of <math> 0.25 \pi < \delta_{CP} < 0.95 \pi </math> in the '''NH''' is disfavored at the 90% C.L. |

## Revision as of 15:16, 28 May 2021

## Contents

# Analysis 2019

The best-fit parameters of neutrino oscillation for each choice of octant and hierarchy. The best-fit point is found for the normal hierarchy in the upper octant. In this case:

Other results is showen by table:

NO, LO | IH, UO | IH, LO | |
---|---|---|---|

# Analysis 2017

The results utilize significant improvements in both the simulations and analysis of the data. A joint fit to the data for disappearance and appearance gives the best-fit point as normal mass hierarchy,

,

,

.

The **68.3%** confidence intervals in the **normal** mass hierarchy are

,

,

.

The **inverted** mass hierarchy is **disfavored** at the **95%** confidence level for all
choices of the other oscillation parameters.

# Second Analysis (2016)

The results of the second analysis were published in 2017. This analysis used an exposure equivalent to from the Fermilab NuMI beam.

## Muon neutino disappearance results

The best fit in the **normal hierarchy** gives:

The best fit in the **inverted hierarchy** gives:

Maximal mixing, where , was disfavored at .

## Electron neutrino appearance results

candidates were observed with a background of .

The hypothesis of inverted mass hierarchy with in the lower octant is disfavored at greater than 93% C.L. for all values of .

## Sterile neutrinos

Sterile analysis used data collected from February 2014 to May 2016.

With an exposure of POT-equivalent, **95 NC-like events** were observe in the FD, compared with an expectation of . This result is consistent with three-flavor mixing within **1.03 σ**.
No evidence for depletion of NC events is observed in the FD at a distance of 810 km from the neutrino source and NOvA sees no evidence for active-sterile neutrino mixing.

NOvA set limits of and in a **3+1 model** scenario.

# First Analysis (2015)

The results of the first analysis were published in 2016. This analysis used a 14 kton-equivalent exposure of from the Fermilab NuMI beam.

## Muon-neutrino disappearance results

Assuming the **normal hierarchy**, the measurements have a next view:

and in the 68% CL range , with two statistically degenerate best-fit values:

Assuming the **inverted hierarchy**, the measurements have a next view:

and in the 68% CL range , with two statistically degenerate best-fit values:

## Electron neutrino appearance results

NOvA had observed -like events in the FD, with a background prediction of

The range of in the **IH** is disfavored at the 90% C.L. The range of in the **NH** is disfavored at the 90% C.L.