A case study with neutrino interaction models for Ar and CH Guang - - PowerPoint PPT Presentation

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A case study with neutrino interaction models for Ar and CH

Guang Yang

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Motivation

• In order to examine the importance of CH
• Build a world that in ND, Ar model does

not describe the true universe.

• The Ar model will tune its model

parameters to match the true universe.

• Even if Ar model match the true universe

in ND, the CH measurement can tell the fact that we are in trouble.

• Look into the neutrino energy vs. Y space,

which is used in Cafana for LBL.

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Model for Ar → GENIE

Model para. Included: MvCCRES AhtBY BhtBY C12ToAr40_2p2h_sca.

• LowQ2Sup. (1pi)

FSILikeAvail E2p2h_A E2p2h_B Mnv2p2hEnhan. MvCCRES 1sigma MvCCRES 1sigma AhtBY 1 sigma AhtBY 1 sigma BhtBY 1 sigma BhtBY 1 sigma C12ToAr402p2h C12ToAr402p2h LowQ2Sup. 1 sigma LowQ2Sup 1 sigma

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Measurement → nuwro with 20% missing neu.+pro. energy

• Reco. Energy = true energy – 20% (neutron +

proton energy from nuwro)

Energy feed-down Due to missing neutron/proton E.

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Varying the model parameters to make model match the measurement

• Scan along the

parameters with +- 0.5, 1.0, 1.5 sigmas

Parameters: MvCCRES AhtBY BhtBY C12ToAr40_2p2h_sca.

• LowQ2Sup. (1pi)

FSILikeAvail E2p2h_A E2p2h_B Mnv2p2hEnhan.

• Difgerence between model and measurement

still visible: we want to fjnd a case that they match probably → need MINUIT

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Move to CH : model with GENIE

• Nominal on CH on Ar

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Apply the Ar “fjt” parameters to GENIE CH, then look into CH measure.

• The parameters only have ability to move with +-0.5, 1, 1.5

sigmas for now.

• Then look into the CH measurement : we measure the

neutron+proton well so don’t have the missing energy.

Parameters: MvCCRES AhtBY BhtBY C12ToAr40_2p2h_sca.

• LowQ2Sup. (1pi)

FSILikeAvail E2p2h_A E2p2h_B Mnv2p2hEnhan.

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Compare the “fjtted” CH model to CH measurement

• The difgerence is very difgerent from Ar, which means if we fjnd

a way to make Ar match perfect in ND, CH will still not match.

• If such a model problem cannot be found in ND, the oscillation

parameters will be in trouble if directly compare ND Ar to FD Ar.

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Next

• Try to fjnd a way to make Ar GENIE model

match Ar true universe (nuwro) with probably more model dials, or/and, probably need to do minimization instead of very coarse scanning.