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Estimations of pi0 production from charge pion in CC, model dependencies, simulation studies

Estimations of pi0 production from charge pion in CC, model dependencies, simulation studies. Some preliminary considerations continued pawel, 12-09-2007. Neutrino energy reconstruction. Via total momentum

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Estimations of pi0 production from charge pion in CC, model dependencies, simulation studies

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  1. Estimations of pi0 production from charge pion in CC, model dependencies, simulation studies Some preliminary considerations continued pawel, 12-09-2007

  2. Neutrino energy reconstruction • Via total momentum • Sum of outgoing particles’ momenta should give us momentum of the neutrino (assuming the nucleon is at rest – no fermi momentum) • For QE we’ve got another formula • We also assume no fermi momentum here and a clean QE event – muon and proton only ν Outgoing particles) μ θ ν p

  3. Advantages and drawbacks • QE formula needs only observables associated with muon track – but it is in principle valid only for QE interactions • QE formula is therefore senseless for NC events – no muon • Total momentum formula suffers from the fact that not all the final states are visible in the detector • Both methods are impaired by neglecting the fermi motion of the target nucleon (this results in some smearing of the reconstructed energy) • What particles are visible – first guess: muons, electrons, protons, pizeros, pi charged

  4. True (MC) vs total mom (no FSI) • All particles visible – just to show that it works (smearing due to Fermi motion) Ereco [GeV] Ereco [GeV] Solid – MC Energy Dashed - reconstructed Solid – MC Energy Dashed - reconstructed [GeV] E MC [GeV]

  5. True (MC) vs total mom vis(no FSI) Visibility as described before Ereco [GeV] Solid – MC Energy Dashed - reconstructed [GeV] E MC [GeV] Totally invisible events (NC of course, CC have at least a muon)

  6. True (MC) vs QE formula (no FSI) CC events only Ereco [GeV] Solid – MC Energy Dashed - reconstructed E MC [GeV]

  7. Wondering which are QEs and which nonQEs on the scatterplot? Orange dots denote ideal reconstruction nonQEs QEs The large smearing here is because of Fermi motion, but also because Nuance includes deexcitation particles in the final state (gammas, nucleons)!

  8. Quality of reconstruction plots Ereco - EMC Total mom vis QE formula CC

  9. Quality of reconstruction comparison Solid – QE formula, Dashed – Total visible momentum CCQE CC QE formula works better for QE, total momentum is better for others

  10. Inclusion of final state interactions • Doesn’t change anything in QE formula results, since we are using only the properties of outgoing muon, which are not changed by FSIs • May influence total momentum results, because particle visibility changes in the cascade

  11. True (MC) vs total mom vis(FSI incl) 50% less invisible events

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