Neutrino Interactions with Nucleons and Nuclei Tina Leitner

Neutrino oscillation search Flux: obtained from Event-Generators for hadronic production and subsequent weak decay

QE N P. Lipari, Nucl. Phys. Proc. Suppl. 112, 274 (2002) Neutrino nucleon cross

Quasielastic scattering vector form factors • related to EM form factors by CVC •

Axial Formfactor of the Nucleon Recent Data give significantly larger values for MA Mini.

Resonances: Hadronic currents R+ p R++ (I=3/2) CV (Q 2) from electroproduction (MAID), CA(Q

Pion production through ¢ New V, old A New V, new A averaged over

Complications from Nuclear Targets (K 2 K, Mini. Boo. NE, T 2 K, MINOS,

Low-Energy Nuclear Reactions and Structure determine response of nuclei to neutrinos

Neutron Knockout: Final state effects 12 C 1 Ge. V Without FSI With FSI

Mini. Boo. NE CCQE T. Katori, NUINT 09 Neutrino Flux too high by 30%

Pion production in Mini. Boo. NE Data comparable with calculation without FSI, same shape

Energy reconstruction via CCQE-like = muon, but no pion EB = 34 Me. V

Energy reconstruction via CCQE Energy uncertainties affect oscillation mininum and mixing angles

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Neutrino Interactions with Nucleons and Nuclei Tina Leitner, Ulrich Mosel

Contents and Motivation

Neutrino oscillation search Flux: obtained from Event-Generators for hadronic production and subsequent weak decay Energy must be reconstructed from hadronic final state

QE N P. Lipari, Nucl. Phys. Proc. Suppl. 112, 274 (2002) Neutrino nucleon cross section single¼ ¼ N'

Quasielastic scattering vector form factors • related to EM form factors by CVC • BBBA-2007 parametrization axial form factors • related by PCAC • dipole ansatz with MA= 1 Ge. V

Axial Formfactor of the Nucleon Recent Data give significantly larger values for MA Mini. Boo. NE @NUFACT 09: MA = 1. 35 Ge. V, Pauli problem One difference: all old data use H (or D) as target all new data use nuclei (C, O, Fe) as target

Resonances: Hadronic currents R+ p R++ (I=3/2) CV (Q 2) from electroproduction (MAID), CA(Q 2) modelled, fit to (very few) old data

Pion production through ¢ New V, old A New V, new A averaged over ANL flux, W < 1. 4 Ge. V

Pion production off nucleons

Complications from Nuclear Targets (K 2 K, Mini. Boo. NE, T 2 K, MINOS, Minerva, …. ‚Data‘ for any given channel contain admixtures of other channels Needs state-of-the-art treatment of fsi

Low-Energy Nuclear Reactions and Structure determine response of nuclei to neutrinos

Gi. BUU transport for FSI

Model Ingredients: FSI

Neutron Knockout: Final state effects 12 C 1 Ge. V Without FSI With FSI

Mini. Boo. NE K 2 K 0¼+X 0¼+1 p+X

Pion Production ‚Data‘ before FSI

Mini. Boo. NE CCQE T. Katori, NUINT 09 Neutrino Flux too high by 30% ?

Mini. Boo. NE CCQE Grey Band: Data

Pion production in Mini. Boo. NE Data comparable with calculation without FSI, same shape Flux too high? ? BNL data correct?

Energy reconstruction via CCQE-like = muon, but no pion EB = 34 Me. V Rms deviation ~ 15 -20% Shift towards lower energies due to misidentified events

Energy reconstruction via CCQE Energy uncertainties affect oscillation mininum and mixing angles

Conclusions