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Physical Review Letters 85 (2012) 093012
Neutrino energy reconstruction problems and neutrino oscillations
M. Martini1, M. Ericson2, 3, G. Chanfray2

We discuss the accuracy of the usual procedure for neutrino energy reconstruction which is based on the quasielastic kinematics. Our results are described in terms of a probability distribution for a real neutrino energy value. Several factors are responsible of the deviations from the reconstructed value. The main one is the multinucleon component of the neutrino interaction which in the case of Cherenkov detectors enters as a quasielastic cross section, increasing the mean neutrino energy which can differ appreciably from the reconstructed value. As an application we derive, for excess electron events attributed to the conversion of muon neutrinos, the true neutrino energy distribution based on the experimental one which is given in terms of the reconstructed value. The result is a reshaping effect. For MiniBooNE the low energy peak is suppressed and shifted at higher energies, which may influence the interpretation in terms of oscillation. For T2K at the Super Kamiokande far detector the reshaping translates into a narrowing of the energy distribution.
1 :  DAM/DIF - DAM Île-de-France
2 :  IPNL - Institut de Physique Nucléaire de Lyon
3 :  CERN - European Organization for Nuclear Research
Physique/Physique des Hautes Energies - Expérience

Physique/Physique des Hautes Energies - Phénoménologie

Physique/Physique Nucléaire Théorique
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