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One of physics goals of the NA61/SHINE experiment is a measurement of hadron production cross sections from proton-Carbon interactions at 31GeV/c for the T2K experiment at J-PARC. A precise knowledge of differential cross sections for pion and kaon production is of importance for improving the accuracy of neutrino flux simulations. The NA61 detector has a large angular acceptance, full coverage of the T2K phase space region, and good particle identification. In this work the analyses of negatively charged pion production will be presented. Two different methods of negative pion selection and corrections for detector effects will be discussed. Finally, preliminary dn/dp distributions of negatively charged pion in p+C interactions at 31 GeV/c will be presented.

Pion Production Measurement in NA61/SHINE Experiment for High Precision Neutrino Oscillation Experiments