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

A case study with neutrino interaction models for Ar and CH Guang Yang 1 / 9

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. 2 / 9

Model for Ar → GENIE MvCCRES 1sigma Model para. Included: MvCCRES AhtBY MvCCRES 1sigma AhtBY 1 sigma AhtBY 1 sigma BhtBY C12ToAr40_2p2h_sca. LowQ2Sup. (1pi) FSILikeAvail E2p2h_A BhtBY 1 sigma BhtBY 1 sigma C12ToAr402p2h E2p2h_B Mnv2p2hEnhan. C12ToAr402p2h LowQ2Sup. 1 sigma LowQ2Sup 1 sigma 3 / 9

Measurement → nuwro with 20% missing neu.+pro. energy Energy feed-down Due to missing neutron/proton E. ● Reco. Energy = true energy – 20% (neutron + proton energy from nuwro) 4 / 9

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 5 / 9

Move to CH : model with GENIE ● Nominal on CH on Ar 6 / 9

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. 7 / 9

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. 8 / 9

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. 9 / 9