NSI with ANT ARES data N. R. Khan Chowdhury, T arak Thakore 1 - - PowerPoint PPT Presentation

NSI with ANT ARES data

• N. R. Khan Chowdhury, T

arak Thakore

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

1

ANT ARES Data

The official 10 years ANT ARES (2007-2016) dataset containing CC-ν𝜈 events has been used in this analysis. Binning: 8 Bins in log(E) ϵ [ 1.2, 2] times 17 Bins in cosθ ϵ [ 0.15, 1]. Underflow bin accounting for events with log(E) < 1.2 is not accounted anymore. log likelihood function: 2

−2logℒold = 2∑

i,j

[NMC

i,j − Ndata i,j

. logNMC

i,j ] + syst .

−2logℒnew = 2∑

i,j

[NMC

i,j − Ndata i,j

+ Ndata

i,j

. log Ndata

i,j

NMC

i,j ] + syst . 12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

NSI limits with ANT ARES

90% CL limits in ϵ𝜈𝝊-ϵ𝝊𝝊 phase space. Contour drawn w.r.t. to 𝜓2min of phase space scanned for ANT ARES. BF points with DAT A BF for N at: 0.87656 BF for ϵ𝜈𝜐 at: -0.00130138 BF for ϵ𝜐𝜐 at: 0.032054 BF for 𝛦m232 at: 0.00306025 BF for θ23 at: 51.0816 BF for ẟCP at: 0 (Fixed) BF for θ13 at: 8.41128 BF for 𝛿 at: -0.02123 BF for at: 0.994749 BF for N𝜈 at: 415 (Fixed) 𝜓2/ d.of. : 131.851/ 128.

ν/ ¯ ν

3

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

Wrong plot

NSI limits with ANT ARES

90% CL limits in ϵ𝜈𝝊-ϵ𝝊𝝊 phase space. Contour drawn w.r.t. to (0,0) for ANTARES. BF points with DAT A BF for N at: 0.87656 BF for ϵ𝜈𝜐 at: -0.00130138 BF for ϵ𝜐𝜐 at: 0.032054 BF for 𝛦m232 at: 0.00306025 BF for θ23 at: 51.0816 BF for ẟCP at: 0 (Fixed) BF for θ13 at: 8.41128 BF for 𝛿 at: -0.02123 BF for at: 0.994749 BF for N𝜈 at: 415 (Fixed) 𝜓2/ d.of. : 131.851/ 128.

ν/ ¯ ν

4

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

Wrong plot

NSI limits with ANT ARES

90% CL limits in ϵ𝜈𝝊-ϵ𝝊𝝊 phase space. Contour drawn w.r.t. to BF (global minimum) for ANTARES. BF points with DAT A BF for N at: 0.87656 BF for ϵ𝜈𝜐 at: -0.00130138 BF for ϵ𝜐𝜐 at: 0.032054 BF for 𝛦m232 at: 0.00306025 BF for θ23 at: 51.0816 BF for ẟCP at: 0 (Fixed) BF for θ13 at: 8.41128 BF for 𝛿 at: -0.02123 BF for at: 0.994749 BF for N𝜈 at: 415 (Fixed) 𝜓2/ d.of. : 131.851/ 128.

ν/ ¯ ν

5 ϵ𝜐𝜐 is fitted at a non-zero value, which is consistent with |U𝜐4|2 of the sterile analysis.

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

𝛦𝜓2 = 𝜓2(0,0) - 𝜓2(BF) = 5.8. The non-NSI hypothesis is found at −2∆ log L = 5.8 which corresponds to a 2-parameter p-value of 5.5%.

Right plot

NSI limits for ϵ𝜈𝝊 with ANT ARES

Some of the systematics are turned off for brevity. 6 BF points with DAT A BF for N at: 0.826628 BF for ϵ𝜈𝜐 at: -0.00122 BF for ϵ𝜐𝜐 at: 0. (Fixed) BF for 𝛦m232 at: 0.00204686 BF for θ23 at: 46.5116 BF for ẟCP at: 0 (Fixed) BF for θ13 at: 8.41 (Fixed) BF for 𝛿 at: 0 (Fixed) BF for at: 0.98529 BF for N𝜈 at: 415 (Fixed) 𝜓2/ d.of. : 128.09/ 128.

ν/ ¯ ν

For IceCube analysis, the best fit is at ϵ𝜈𝝊 = −0.0005. The 90% C.L. range is −0.0067 < ϵ𝜈𝝊 < 0.0081

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

Summary

Non-NSI hypothesis is discarded at 1.9𝜏 for a 2 parameter NSI hypothesis. ANT ARES can put stringent limits on ϵ𝜈𝜐 compared to current limits. A strong anti-correlation is found between 𝛦m232 and ϵ𝜈𝜐. (consistent with IceCube paper.) There is a marginal improvement while moving from sensitivities to limits in case of NSI parameter ϵ𝜈𝜐. The improvement can be attributed to the shallower minimum of the first oscillation dip in ANT ARES data. 7

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

Thanks

8

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

𝛦m232 -ϵ𝜈𝝊 correlation

Fitted values of 𝛦m232 as a function of test ϵ𝜈𝝊. NSI might mimic wrong values of 𝛦m232. A prior 
 may be used for further analysis. ANT ARES might be missing the first oscillation
 dip which could have constrained 𝛦m232. 9

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

NSI limits with ANT ARES

90% CL limits in ϵe𝜈-ϵe𝝊 phase space. 10

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |

90% CL limits in ϵe𝝊-ϵ𝝊𝝊 phase space. The island on the right plot will vanish if the likelihood landscape is smoothened/smeared. 11

NSI limits with ANT ARES

12th Dec. 2019 | N. R. Khan Chowdhury | Weekly Meeting | IFIC |