# Difference between revisions of "NOvA results"

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− | = | + | =Analysis 2019= |

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

+ | The best-fit point is found for the normal hierarchy <math> \theta_{23} </math> in the upper octant. In this case: | ||

− | == | + | <math> \Delta m_{32}^2 = +2.48^{=0.11}_{-0.06} \times 10^{-3} eV^2/c^4 </math> |

− | + | <math> sin^2 \theta_{23} = 0.56^{+0.04}_{-0.03} </math> | |

− | <math> | + | <math> \delta_{CP} = 0.0^{+1.3}_{-0.4} \pi </math> |

− | + | Other results is showen by table: | |

− | + | <table border="1" width="25%" cellpadding="5"> | |

+ | <tr> | ||

+ | <td> </td> | ||

+ | <th> NO, LO </th> | ||

+ | <th> IH, UO </th> | ||

+ | <th> IH, LO </th> | ||

+ | </tr> | ||

+ | <tr> | ||

+ | <td> <math> \Delta m_{32}^2/ (10^{-3} eV^2/c^4) </math> </td> | ||

+ | <td> <math> +2.47 </math> </td> | ||

+ | <td> <math> -2.54 </math> </td> | ||

+ | <td> <math> -2.53 </math> </td> | ||

+ | </tr> | ||

+ | <tr> | ||

+ | <td> <math> sin^2 \theta_{23} </math> </td> | ||

+ | <td> <math> 0.48 </math> </td> | ||

+ | <td> <math> 0.56 </math> </td> | ||

+ | <td> <math> 0.47 </math> </td> | ||

+ | </tr> | ||

+ | <tr> | ||

+ | <td> <math> \delta_{CP}/ \pi </math> </td> | ||

+ | <td> <math> 1.9 </math> </td> | ||

+ | <td> <math> 1.5 </math> </td> | ||

+ | <td> <math> 1.4 </math> </td> | ||

+ | </tr> | ||

+ | <tr> | ||

+ | <td> </td> | ||

+ | <td> <math> +1.6\sigma </math> </td> | ||

+ | <td> <math> +1.8\sigma </math> </td> | ||

+ | <td> <math> +2.0\sigma </math> </td> | ||

+ | </tr> | ||

+ | </table> | ||

− | + | =Analysis 2017= | |

− | <math> | + | =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. | ||

− | + | ==Muon neutino disappearance results== | |

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

+ | <math> \Delta m_{32}^2 = (2.67 \pm 0.11 ) \times 10^{-3} eV^2</math> | ||

− | = | + | <math> sin^2 \theta_{23} = 0.404^{+0.030}_{-0.022} \ (0.624^{+0.022}_{-0.030}) </math> |

− | + | The best fit in the '''inverted hierarchy''' gives: | |

− | == | + | <math> \Delta m_{32}^2 = (-2.72 \pm 0.11 ) \times 10^{-3} eV^2</math> |

+ | |||

+ | <math> sin^2 \theta_{23} = 0.398^{+0.030}_{-0.022} (0.618^{+0.022}_{-0.030}) </math> | ||

+ | |||

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

+ | |||

+ | ==Electron neutrino appearance results== | ||

+ | |||

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

+ | |||

+ | The hypothesis of inverted mass hierarchy with <math> \theta_{23} </math> in the lower octant is disfavored at greater than 93% C.L. for all values of <math> \delta_{CP} </math>. | ||

+ | |||

+ | |||

+ | ==Sterile neutrinos?== | ||

+ | |||

+ | |||

+ | =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. | ||

+ | |||

+ | ==Muon-neutrino disappearance results== | ||

+ | |||

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

+ | |||

+ | <math> \Delta m^{2}_{32} = 2.52^{+0.20}_{-0.18} \times 10^{-3} eV^2 </math> | ||

+ | |||

+ | and <math> sin^2 \theta_{23} </math> in the 68% CL range <math> [0.38, 0.65] </math>, with two statistically degenerate best-fit values: | ||

+ | |||

+ | <math> sin^2 \theta_{23} = 0.43 \ (0.60) </math> | ||

+ | |||

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

+ | |||

+ | <math> \Delta m^{2}_{32} = -2.56 \pm 0.19 \times 10^{-3} eV^2 </math> | ||

+ | |||

+ | and <math> sin^2 \theta_{23} </math> in the 68% CL range <math> [0.37, 0.64] </math>, with two statistically degenerate best-fit values: | ||

+ | |||

+ | <math> sin^2 \theta_{23} = 0.44 \ (0.59) </math> | ||

+ | |||

+ | |||

+ | ==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> | ||

+ | |||

+ | 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. |

## Latest revision as of 10:43, 13 December 2019

## 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

# 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?

# 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.