Freiburg 2008 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 18: Neutrinophysik (Theorie)

T 18.4: Vortrag

Freitag, 7. März 2008, 14:45–15:00, Peterhof-HS 4

Nuclear aspects of neutrino energy reconstruction in current oscillation experiments — •Tina Leitner¹, Oliver Buss¹, Ulrich Mosel¹, and Luis Alvarez-Ruso² — ¹Institut für Theoretische Physik, Universität Gießen — ²Departamento de Física Teórica and IFIC, Universidad de Valencia - CSIC, Spain

There is an extensive experimental effort aiming at a precise determination of neutrino oscillation parameters. A critical quantity is the neutrino energy which can not be measured directly but has to be reconstructed from observables. A good knowledge of neutrino-nucleus interactions is thus necessary to minimize the systematic uncertainties in neutrino fluxes, backgrounds and detector responses. A reliable reconstruction has to account for in-medium modifications. We find that in particular final-state interactions inside the target nucleus modify considerably the distributions through rescattering, charge-exchange and absorption. These effects can be simulated with our coupled channel GiBUU transport model where the neutrino first interacts with a bound nucleon producing secondary particles which are then transported out of the nucleus. We consider, besides Fermi motion and Pauli blocking, full in-medium kinematics, mean-field potentials and in-medium spectral functions. In this contribution, we compare the reconstructed quantities obtained within our model to the ones obtained by the current experiments like MiniBooNE, which mostly rely on simple two-body kinematics. We then discuss how these uncertainties influence not only the cross section measurements but also the oscillation results. Supported by DFG.