Difference between revisions of "NOvA results"

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Other results is showen by table:
 
Other results is showen by table:
  
<table border="1" width="100%" cellpadding="5">
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<table border="1" width="25%" cellpadding="5">
 
   <tr>  
 
   <tr>  
 
     <td> &nbsp; </td>  
 
     <td> &nbsp; </td>  
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   </tr>   
 
   </tr>   
 
   <tr>  
 
   <tr>  
     <td> <math> \delta_{CP} </math> </td>  
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     <td> <math> \delta_{CP}/ \pi </math> </td>  
 
     <td> <math> 1.9 </math> </td>  
 
     <td> <math> 1.9 </math> </td>  
 
     <td> <math> 1.5 </math> </td>  
 
     <td> <math> 1.5 </math> </td>  
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</table>
 
</table>
  
=Second Analysis=
+
=Analysis 2017=
  
==Nue appearance results (Preliminary)==
+
=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.
  
==Numu disappearance results (Preliminary)==
+
==Muon neutino disappearance results==
  
Best fit in '''Normal Hierarchy'''
+
The best fit in the '''normal hierarchy''' gives:
  
<math> |\Delta m_{32}^2 | = (2.67 \pm 0.12 ) \times 10^{-3} eV^2</math>
+
<math> \Delta m_{32}^2 = (2.67 \pm 0.11 ) \times 10^{-3} eV^2</math>
  
<math> sin^2 \theta_{23} = 0.40^{+0.03}_{-0.02} (0.63^{+0.02}_{-0.03}) </math>
+
<math> sin^2 \theta_{23} = 0.404^{+0.030}_{-0.022} \ (0.624^{+0.022}_{-0.030}) </math>
  
Best fit in '''Inverted Hierarchy'''
+
The best fit in the '''inverted hierarchy''' gives:
  
<math> |\Delta m_{32}^2 | = (-2.71 \pm 0.12 ) \times 10^{-3} eV^2</math>
+
<math> \Delta m_{32}^2 = (-2.72 \pm 0.11 ) \times 10^{-3} eV^2</math>
  
<math> sin^2 \theta_{23} = 0.40^{+0.03}_{-0.02} (0.62^{+0.02}_{-0.03}) </math>
+
<math> sin^2 \theta_{23} = 0.398^{+0.030}_{-0.022} (0.618^{+0.022}_{-0.030}) </math>
  
'''Maximal mixing excluded at''' <math> 2.5 \sigma</math>
+
Maximal mixing, where <math> sin^2 \theta_{23} = 0.5 </math>, was disfavored at <math> 2.6 \sigma</math>.
  
==Sterile neutrinos? (Preliminary)==
+
==Electron neutrino appearance results==
  
 +
<math> 33 \ \nu_{e} </math> candidates were observed with a background of <math> 8.2 \pm 0.8 \ (syst.) </math>.
  
=First Analysis=
+
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>.
  
==Nue appearance results==
 
  
==Numu disappearance results==
+
==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

Analysis 2019

The best-fit parameters of neutrino oscillation for each choice of  \theta_{23} octant and hierarchy. The best-fit point is found for the normal hierarchy  \theta_{23} in the upper octant. In this case:

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

 sin^2 \theta_{23} = 0.56^{+0.04}_{-0.03}

 \delta_{CP} = 0.0^{+1.3}_{-0.4} \pi

Other results is showen by table:

  NO, LO IH, UO IH, LO
 \Delta m_{32}^2/ (10^{-3} eV^2/c^4)  +2.47  -2.54  -2.53
 sin^2 \theta_{23}  0.48  0.56  0.47
 \delta_{CP}/ \pi  1.9  1.5  1.4
   +1.6\sigma  +1.8\sigma  +2.0\sigma

Analysis 2017

Second Analysis (2016)

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

Muon neutino disappearance results

The best fit in the normal hierarchy gives:

 \Delta m_{32}^2  = (2.67 \pm 0.11 ) \times 10^{-3} eV^2

 sin^2 \theta_{23} = 0.404^{+0.030}_{-0.022} \ (0.624^{+0.022}_{-0.030})

The best fit in the inverted hierarchy gives:

 \Delta m_{32}^2  = (-2.72 \pm 0.11 ) \times 10^{-3} eV^2

 sin^2 \theta_{23} = 0.398^{+0.030}_{-0.022} (0.618^{+0.022}_{-0.030})

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

Electron neutrino appearance results

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

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


Sterile neutrinos?

First Analysis (2015)

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

Muon-neutrino disappearance results

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

 \Delta m^{2}_{32} = 2.52^{+0.20}_{-0.18} \times 10^{-3} eV^2

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

 sin^2 \theta_{23} = 0.43 \ (0.60)

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

 \Delta m^{2}_{32} = -2.56 \pm 0.19 \times 10^{-3} eV^2

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

 sin^2 \theta_{23} = 0.44 \ (0.59)


Electron neutrino appearance results

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

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