Pion production uncertainty in context of Tokai2Kamioka (T2K) experiment

Abstract

We evaluate uncertainty of the neutral current !0 production coming from li- mited knowledge of axial form-factor. The uncertainties of the form-factor pa- rameters are obtained from a self-consistent fit to the results of ANL and BNL experiments measuring pion production free of significant nuclear effects. The evaluated uncertainities are important for T2K background estimates