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GENIE

GENIE. MC GE nerator for N eutrino I nteraction E xperiments. Authors: Costas Andreopoulos, Panos Stamoulis, George Tzanakos. Object-Oriented Design Extensive use of Design Patterns & Reusable Software Architectures Extensive use of ROOT & STL Extensive use of XML

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GENIE

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  1. GENIE MC GEnerator for Neutrino Interaction Experiments Authors: Costas Andreopoulos, Panos Stamoulis, George Tzanakos • Object-Oriented Design • Extensive use of Design Patterns & Reusable Software Architectures • Extensive use of ROOT & STL • Extensive use of XML • Network (TCP/IP) Interfaces • Modeling of all neutrino interaction processes, calculation of cross sections, form factors, parton densities... • Modeling of auxiliary phenomena : 3-D neutrino oscillations, matter effects, muon energy loss mechanisms... GENIE is in prototyping-phase This work was based on Prototype Version 1 Version 2 will be on public domain (distributed under GPL) this summer

  2. Modeling of Neutrino Oscillations • 3 - flavor oscillations • One dominant mass scale approximation • Switching matter effects ON/OFF In this framework, the vμsurvival probability, for example, is Example: Δm232=0.004 eV2/c4 θ23=45ο, θ13=11.5ο

  3. Neutrino Interactions Include: Quasi Elastic Scattering Single Pion Production Deep Inelastic Scattering Leptonic tensor: well known from V-A theory Hadronic tensor? • Quasi Elastic Scattering : Simple! The neutrino sees a “structureless” target nucleon. • Single Pion Production : Complex! Need a dynamical model to describe the bound state of quarks. • Deep Inelastic Scattering : Simple again! The neutrino sees the nucleon structure but scatters off a structureless parton.

  4. Neutrino Interactions - Quasi Elastic Scattering We use the parameterization of E.A.Pashos and J.Y.Yu, “Neutrino Interactions in Oscillation Experiments”, hep-ph/0107261 CC QE Form Factors Kinematic Limits

  5. Quasi Elastic Scattering - Predictions & Comparisons with data

  6. Neutrino Interactions - Single Pion Production • We use the model of Deiter Rein and Lalit M. Seghal, “Neutrino - Excitation of Baryon Resonances and Single Pion Production”, Ann. Phys, 133, 79 (1981) • This model is based on the dynamical model of baryon excitation of R.P. Feynman, M. Kislinger and F. Ravndal, Phys. Rev. D 3, 2706 (1971) Helicity components Kinematical Limits q2: same as in QE (MNMRES) W:

  7. Single Pion ProductionBaryonic Resonances • Taking into account 16 resonances • Single Pion Production is dominated by Δ(1232)P33 Each resonance is described by a Breit-Wigner distribution with an L-dependent threshold behavior

  8. Single Pion Production Isospin Analysis • Cross Sections for different channels are built from cross sections for exciting baryon resonances • Using isospin Glebsch-Gordon coefficients • Original expressions by Rein-Seghal were modified by assuming non-interference between different resonances

  9. Single Pion Production - Predictions & Comparisons with data

  10. Neutrino Interactions - Deep Inelastic Scattering • We use the parameterization of E.A.Pashos and J.Y.Yu, “Neutrino Interactions in Oscillation Experiments”, hep-ph/0107261 Parton Density Functions • We use the MRST99 parton density function set • MRST99 is described in hep-ph/9907231 (A.D. Martin, R.G. Roberts, W.J. Stirling, R.S. Thorne) • The ‘evolution’ stops at Q2min=1.25GeV2. For Q2<Q2min we consider pdfs to be the same as for Q2=Q2min

  11. DIS - Predictions & Comparisons with data

  12. All modeled Neutrino Interaction Processes

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