Impact of NSI on NMO and Octant Sensitivity with ORCA N. R. Khan - - PowerPoint PPT Presentation

Impact of NSI on NMO and Octant Sensitivity with ORCA

• N. R. Khan Chowdhury, Tarak Thakore
• Oct. 10, 2019 | N. R. Khan Chowdhury | ANTARES & KM3NeT Collaboration Meeting | Warsaw |

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1) Impact of NSI on NMO

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𝛇𝜈𝜐 = -0.05 𝛇𝜈𝜐 = 0.05 𝛇𝜈𝜐 = 0

PNH

𝜈𝜈

PIH

𝜈𝜈

NSI mimics the wrong ordering!

Methodology: Treating NSI as systematics

1) Simulate toy data set with some value of NSI. 2) Release the NSI parameter in the fit. 3) Calculate NMO sensitivity.

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NMO sensitivity considerably abated by 𝛇e𝜈 and 𝛇e𝜐

NMO sensitivity in presence of NSI in data

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NMO sensitivity marginally “not” affected by 𝛇𝜈𝜐 and 𝛇𝜐𝜐

NMO sensitivity in presence of NSI in data

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Asimov NMO sensitivity

NMO sensitivity with NSI in fit

Data generated with standard 3 flavor oscillations. Fit over oscillation parameters, systematics and NSI parameter. Repeat for different true values of 𝜾23. ~1𝜏 dilution with NSI 𝛝e𝝊.

2) Octant Sensitivity with ORCA115

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Octant degeneracy

The ambiguity in the determination of 𝜾23 can be from 1) Inherent octant degeneracy: oscillation and survival probabilities are function of sin22𝜾23. 2) Degeneracy of the octant with other oscillation parameters: oscillation and survival probabilities are function of sin2𝜾23.

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Octant ambiguity ensued in P𝝂e and Pee

The relevant probabilities in the OMSD approximation with matter effects reads During matter resonance, sin2𝜾13

m reaches value of 1 irrespective of the value of

𝜾13 and the product is no longer invariant. The electron survival probability is independent of 𝜾23 and does not contribute to

• ctant sensitivity.

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Octant ambiguity ensued in P𝝂𝝂

The muon survival probability in matter has leading terms proportional to sin22𝜾23 (intrinsic octant degeneracy). But the strong octant sensitive behaviour of sin4𝜾23sin22𝜾13

m near resonance can override the degeneracy.

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Asymmetry in P𝝂𝝂 and P𝝂e channel

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Octant Sensitivity: Effect on 𝜺CP

NMO is assumed to be known since the time scale involved would ensure NMO is determined before any significant octant sensitivity is achieved. (Wrong octant - wrong ordering excluded.) 1) Nearly independent of 𝜺CP. Dependence is suppressed by matter resonance. 2) Assuming IH gives worse results since, matter resonance and octant sensitivity comes from the anti-nu channel for which flux and cross-section are lower. 3) HO (true) gives lower sensitivity because of normalisation factor.

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Octant Sensitivity

Hierarchy not fitted again. IH gives worse sensitivity for low lower anti-neutrino flux and interaction cross-section.

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Summary:

1) Impact of NSI on NMO sensitivity has been explored. 2) Preliminary estimation of octant sensitivity has been studied. 3) Study of NSI impact on octant sensitivity is foreseen in coming days.

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THANKS

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ANTARES Sensitivity:

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ANTARES Upper Limits:

1) Same Data sample used as in ANTARES Oscil. paper. 2) Same set of systematic parameters and priors.

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ANTARES (3+NSI) Fit results:

1) Fit for NO. No priors on atmo. osc. parameters. 2) All other NSIs are fixed at zero. (conservative limit!) 3) Systematics and priors as in the

• fficial analysis.

Effect of systematics:

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Old plot!