Charged current single pion to quasi-elastic cross section ratio

Charged current pi+ (CCPi+) interactions are important in many neutrino experiments, including those studying neutrino oscillations, but the cross section for this process is not well understood at low energies. We present a new measurement of the CCPi+ cross section as a ratio to the charged current quasi-elastic cross section for muon neutrinos on mineral oil in the MiniBooNE experiment. With more than 46,000 CCPi+ events collected in MiniBooNE, this measurement represents a dramatic improvement in statistics and precision over previous results at low energies.