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MEC selection in NuWro

MEC selection in NuWro. Paweł Przewłocki, Warsaw Neutrino Group NIWG Premeeting 1, Tokai , Jan 2013. What it is about. We are preparing to try to select samples of MEC events ( generated by NuWro ) in ND280 tracker

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MEC selection in NuWro

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  1. MEC selection in NuWro Paweł Przewłocki, Warsaw Neutrino Group NIWG Premeeting 1, Tokai, Jan 2013

  2. Whatitisabout • We arepreparing to try to selectsamples of MEC events (generated by NuWro) in ND280 tracker • Thispresentationshowsourfirstideasbased on bare generator output (i.e. ND280MC was not involved) • As a next step, a full ND280 simulationwill be performed, and Wojtek Oryszczakispreparing to makeselectionusing FGD containedtracks

  3. Simulationsamples • 200.000 evts in threesamples (fullgeneration with MEC channel, threemodels: Marteau, Nieves, TEM) • Used Nuwro11j (from 2 weeks ago) • Target: carbon • ND280 nu_mubeam • Statistics: Onlyneutrinosup to 3 GeVaretakenintoaccount CCQE CCMEC CCRES CCDIS NC Sample with MEC: Marteau Enu [MeV]

  4. Selection and visibilitycuts • Most hadrons from oureventswill be contained in FGD • Visibilityassumptions for FGD: • protonsvisibleabove p=550 MeV/c • charged pions visibleabove p=200 MeV/c • Simple sampleselection: „CCQE-like” • one muon, no visiblecharged pions, no neutral pions • We separate the sampleintosignal (MEC) and background (others, mainly CCQE) usingMonteCarloinformation (interactiontype flag) CCQE CCMEC CCRES Sample with MEC: Marteau Enu [MeV]

  5. Thresholdmomentum for hadrons (prod5) • Protons and pions (Wojtek Oryszczak) – MC of neutrino interactions • Protons (Joanna Zalipska) - isotropicsample, with and w/o muons) pions protons protons

  6. Muon energy and angle shapecomparison shapecomparison Not showing TEM here-unphysicalshapebecause of fermimotion not takenintoaccount (Sampleselection: one muon, no neutral pions, no charged pions over 200 MeV/c) No significantdifferences

  7. Number of visibleprotons (Sampleselection: one muon, no neutral pions, no charged pions over 200 MeV/c) depends a lot on FSI !! realistic cut on proton momentum ambitious cut on proton momentum

  8. Visibleenergy of hadrons (Sampleselection: one muon, no neutral pions, no charged pions over 200 MeV/c) • Absolute • Normalized (shapecomparison) Here we sum kineticenergy of ALL hadrons (no momentumcuts) – somethinglikevertexactivity (PID not needed) Promisingvariable (largedifferencesbetween MEC modelsthough)

  9. Hadron energy vs energy transfer Marteau bg Chosen cut: Hadron energy>500 MeV Energy transfer<200 MeV Nieves

  10. Errors of neutrino energyreconstruction (CCQE formula) • delta=(Etrue-Ereco)/Etrue • Three plots for 0,1,2 protonsvisible (550MeV/c threshold) • Shapecomparison (Sampleselection: one muon, no neutral pions, no charged pions over 200 MeV/c)

  11. Summary • Someinterestingvariableshavebeenselected for furtherstudy • Full ND280MC simulationisplanned for NuWrosamples to test whatare the selectionpossibilities in the real detector environment

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