Noemi Rocco

INFN & Sapienza Universita of Roma, Italy

Two particle-two hole final states in neutrino-nucleus interactions and the axial mass puzzle

It has been argued that the large excess of charge current quasi-elastic (CCQE) neutrino-carbon cross section observed by the MiniBooNE collaboration may be ascribed to the excitation of two particle-two hole nuclear final states, not taken into account in Monte Carlo simulations for data analysis. I will discuss the mechanisms leading to the appearance of two particle-two hole states and show that interference between the amplitudes involving one- and two-nucleon currents, not consistently included in existing calculations, plays a major role. Special emphasis will be put on the construction and subsequent evaluation of the electromagnetic meson exchange currents (MEC), obtained using their fully relativistic expression. Preliminary results of a novel approach allowing to treat one- and two-nucleon current contributions on the same footing will be presented.

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