Hadron Production Measurements for Fermilab Neutrino Beams

An extension of the NA61/SHINE physics program utilizing hadron production measurements for Fermilab neutrino beams is proposed. The initiative originated from the US groups (the US-NA61 Collaboration) and is supported by the NA61/SHINE Collaboration. The US groups intend to join the NA61/SHINE Collaboration to perform these measurements. We wish to collect dedicated and optimized high-precision hadron production data needed for improved neutrino beams modeling necessary for ongoing and future experiments at Fermilab. Presented is a schedule, analysis and a detector upgrade plan to expose thin targets and replicas of targets used at Fermilab to the NA61/SHINE hadron beam to accumulate a suitably large sample of events to provide a data set which would be essential for future neutrino beams including running experiments using the NuMI and LBNF facilities.