The study of pion production and the effects of final state interactions
(FSI) are important for data analysis in all neutrino experiments. For energies
at which current neutrino experiments are being operated, a significant
contribution to pion production is made by resonance production process. After
its production, if a pion is absorbed in the nuclear matter, the event may
become indistinguishable from quasi-elastic scattering process and acts as a
background. The estimation of this background is very essential for oscillation
experiments and requires good theoretical models for both pion production at
primary vertex and after FSI. Due to FSI, the number of final state pions is
significantly different from the number produced at primary vertex. As the
neutrino detectors can observe only the final state particles, the correct
information about the particles produced at the primary vertex is overshadowed
by FSI. To overcome this difficulty, a good knowledge of FSI is required which
may be provided by theoretical models incorporated in Monte Carlo (MC) neutrino
event generators. In this work, we will present simulated events for two
different MC generators - GENIE and NuWro, for pion production in νμ​CC
interactions on 40Ar target in DUNE experimental set up. A brief outline
of theoretical models used by generators is presented. The results of pion
production are presented in the form of tables showing the occupancy of primary
and final state pion topologies with 100% detector resolution and with
kinetic energy detector threshold cuts. We observe that NuWro (v-19.02.2) is
more transparent (less responsive) to absorption and charge exchange processes
as compared to GENIE (v-3.00.06), pions are more likely to be absorbed than
created during their intranuclear transport and there is need to improve
detector technology to improve the detector threshold for better results.Comment: 14 pages, 6 figures, 10 table