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Pawel Przewlocki

Warsaw: nuclear reinteractions in argon nucleus and QE/nQE separation, pizero events identification. Pawel Przewlocki. Nuclear reinteractions and QE/nQE separation. Trying to evaluate the impact of proper FSI implementation on QE/nQE separation

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Pawel Przewlocki

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  1. Warsaw: nuclear reinteractions in argon nucleus and QE/nQE separation, pizero events identification Pawel Przewlocki

  2. Nuclear reinteractions and QE/nQE separation • Trying to evaluate the impact of proper FSI implementation on QE/nQE separation • We use Nuance 3.006 with nuclear reinteractions (aka FSI) inside argon nucleus • 100.000 interactions simulated (nu_mus from T2K beam) • Signal: CCQE events with two tracks – muon and proton – identifiable • Background: CCnQE events with two tracks – muon and proton – identifiable • A particle is considered identifiable when it lits up at least 3 consecutive wires in the detector (this in principle allows to identify it) • Example discriminating variable in this analysis: deviation angle

  3. Deviation • Deviation will be the discriminating variable here Visible muon Incoming neutrino Visible proton This would be the proton track, if it were true QE interaction with no fermi momentum of the target nucleon The angle between these two is deviation

  4. Why FSI are so important? No FSI (Fermi & Pauli included) With FSI – larger spread

  5. Can we trust FSI model in Nuance? • NUX+Fluka simulation as a cross-check • A thoroughly tested simulation for nuclear and particle physics • Resonant channels, energy of neutrinos @ 1750MeV • With and without rescattering in nucleus • A number of particles of each type per event and average momentum are given There is a rough agreement between both generators when it comes to number of nucleons

  6. Deviation for signal and bg samples Magnification: almost no signal here signal background

  7. Selection results & conclusions • Number of events at the beginning • 21587 of sig, 4892 of bg • Selecting events with deviation over 0.6 gives: • 19851 of sig evts and 3170 of bg evts • Efficiency is therefore 92%, purity 86.2% (original purity of the sample was 81.5%) • Not a big selection power, but… • Important dependence on FSI, real data will give us an opportunity to verify the validity of FSI implementation in simulations

  8. FSI and pizero separation • FSI inclusions makes vertex identification more difficult (neutron noise) • This may have a bad influence on electron/pizero events separation capability (gap method) • Studies are ongoing, an attempt is being made to evaluate total separation capability based on three methods: dE/dx, two showers visible, gap g g g g

  9. Summary • We have a good simulation tool and we are using it in the following areas: • Ongoing: Electron/pizero events separation • Ongoing: QE/nQE separation • Plans: Hadron energy reconstruction

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